spring-charged operatingmechanism

INSTRUCTIONS GEK 7153cSUPERSEDES GEK-7163F

SPRING-CHARGEDOPERATING MECHANISM

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CONTENTSIntroduction . .Receiving, Handling

and Storage, .Description . . .Installation . . .Operation . . .Maintenance . .Replacement Parts

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G E N E R A L E L E C T R I C

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Courtesy of NationalSwitchgear.com

GEK 7153 Spring-charged Operating Mechanism Type ML-14-0

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Heater Power-FusedDisconnect Switch

Trip Control Power-FusedDisconnect Switch

Recloser Cut-out SwitchOil Circuit Breaker

8C Permissive Control SwitchOpened by manual trippingdevice on the mechanism-Hand Reset to Close

ACR RecloserInterlocking Relay and Contacts for 79Recloser Timing MotorClutch Release Unit and Contacts for 79Anti-pump Unit and Contacts for 79

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Normally Closed Auxiliary Switch-Closed when 52 is open

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Fig. 1 Typical Connection DiagramBreaker Position - Open

Closing Springs — Discharged

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SPRING-CHARGED OPERATING MECHANISMTYPE ML»14~©

INTRODUCTIONoperating equipment are enclosed in aweatherproof housing designed for mount-ing on the front end of the breaker. D-cvoltage is required for the control circuit. OPERATION. The following instructionsA-c voltage is recommended for the will provide information for placing thespring-charging motor and required for mechanism and breaker in service and forthe heater circuits. Since the control the necessary maintenance. It should becircuit requires very low operating cur- kept in mind that the illustrations in therents, the .necessity for large storage instruction book are for illustrative pur-batteries or rectifiers is eliminated, poses and may not always be an actualBatteries are recommended for the d-c picture of the equipment being furnished,

source. The mechanism and its accessories For final information always refer to thewill operate at the standard ANSI voltage drawings that are furnished separatelyratings. The breaker nameplate is with the equipment. For additionalmounted on the inside of the front doorof the mechanism housing.

PROPER INSTALLATION ANDMAINTENANCE ARE NECESSARYFOR CONTINUED SATISFACTORY

The Type ML-14-0 operator is aspring operated mechanism for outdooroil-blast circuit breakers. It is designed forhigh speed operation during the circuitbreaker interruption of faults and highspeed reclosing. It is mechanically trip-free and non-pumping when closed onshort circuits. Its high speed characteristicis the result of a simple, ingenious, ruggedlinkage design having low-friction bear-ings.

instructions on the circuit breaker, referto the breaker instruction book.mechanism and associatedThe

RECEIVING, HANDLING AND STORAGE

Each mechanism is carefully in- removed carefully using a nail puller, to prevent rusting. If stored for anyspected and packed by workmen exper- Check all parts against the packing list to length of time, periodic inspectionsfenced in the proper handling and packing make certain that no parts have been should be made to see that corrosion hasof electrical equipment. Immediately overlooked while unpacking. Always not taken place and to insure good mech-upon receipt of a mechanism, an examin- search the packing material for hardware anical condition. If possible, the spaceation should be made for any damage that may have loosened in transit,sustained during shipment. If injury orrough handling is evident, a damage claimshould be filed with the transportationcompany, and the nearest General Elec- in the proper location immediately, and ittrie Apparatus Sales Office should be is necessary to store the equipment, it under unfavorable atmospheric condi-promptly notified .

©heater should be energized to preventmoisture condensation inside the mech-anism housing.

If the mechanism cannot be installedShould the mechanism be stored

should be kept in a clean, dry place pro- tions, steps should be taken to dry outtected from mechanical injury. Machined the mechanism before it is placed in

The crating or boxing must be parts should be coated heavily with grease service

DESCRIPTION

located a motor for charging the closingsprings, closing spring’s operating mech-

The control house for this mechanism, auxiliary switch and the controlanism is a steel weatherproof house panel with its relaying, operating andwhich contains a felt strip as a sealant control switches and BCT terminalaround the doors. Inside this housing are boards.

The ML-14 spring-charged operatorconsists of motor operated closing springswith the associated mechanism andcontrol equipment. The unit is designedto operate large outdoor oil circuit break-ers with provision for closing, opening,

trip-free and reclosing operations

These instructions do not purport to cover all details or variations in equipment nor to provide forevery possible contingency to be met in connection with installation, operation or maintenance.further information be desired or should particular problems arise which are not cove2:ed sufficiently forthe purchaser’ s purposes , the matter should be referred to the General Electric Company.© Should

To the extent required the products described herein meet applicable ANSI , IEEE and NEMA standards;.but no sticb assurance is given with respect to local codes and ordinances because they vary greatly .3




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23. Closing Latch Monitoring SwitchOperating Lever

Manual Close Push Rod ButtonEccentricManual Charging Stud (5/8 inch hex)Driving LinkRight Closing SpringBreaker NameplateCurrent Transformer NameplateDriving ChainHeaterCharge-discharge Indicator Window

Closing Spring BlockingDeviceOperation CounterTrip Coil (52TC)Operation Counter WindowLock-out Switch (69 Device)Bushing Current Transformer

Terminal BoardsManual Trip LeverTrip Latch RollerManual Trip Push ButtonRatchet Wheel

13.1. House Support Bracket2. Breaker Vertical Operating Rod3. Auxiliary Switch4. Output Crank5. Prop Reset Spring6. Trip Latch7. Charge-discharge Indicator8. Guide Block9. Motor Limit Switches

10. Latch Checking Switch11. Spring-charging Motor12. Left Closing Spring

14. 24.15. 25,16. 26.17. 27.

28.18.29.30.19.31.20.32.21 .33.22. i

Fig. 2 Front View of Mechanism

4



Spring-charged Operating Mechanism Type ML-14-0 GEK 7153

Remove the waxNOTE:paper strips which are be-tween the door jam and thedoors of the control house

is either ac or d-e, but preferably a-c. when in use. NEVER AT-TEMPT SLOW MANUALC L O S I N G WITH THEBLOCKING DEVICE INPLACE AND THE BREAK-ER IN SERVICE. OPERATESLOWLY AND MANUALLYONLY WHEN THE BREAK-ER HAS BEEN COMPLETE-LY DEENERGIZED ANDISOLATED.

f )Also provided on the equipment is a

manual trip device. This consists of amechanism for manually tripping thebreaker and a lock-out switch for openingthe closing circuit, io prevent the breakerfrom closing from a remote source whenit is tripped by this mechanism locally.

before energizing the heater.These strips are for paint pro-tection during shipment andwill not make a good weatherseal if left in place.

Control voltages are given on thenameplate. The motor operating voltage

NOTE: This mechanism isdesigned for electrical closing

INSTALLATION

During the installation of the mech- obtain the correct alignment of the ver-anism, it is necessary to make reference tical rod and its cover pipe,to the instruction book for the oil circuitbreaker that it operates.

Use control wiring of adequate sizeso that with full operating current flow -ing to the operating mechanism, thevoltage across the terminals of tire mech-anism will be within the limits specifiedas standard for the range of controlvoltage.

Raise the mechanism with a craneand align the mounting stud holes in the

The mechanism and housing are mechanism housing to those on thenormally shipped fastened directly to the breaker framework and insert the studs,

frame of the oil circuit breaker. The Tighten all nuts securely and lock withmechanism is installed and properly ad- set screws. Use the proper connection diagramjusted when received. The trip latches are * for each individual job for testing andfastened during shipment and this fasten- Install the vertical operating rod making connections. The mechanism ising should be removed after the breaker cover pipe between the front crank cover wired completely at the factory tohas been moved into position. support and the top of the mechanism terminal boards mounted on the bottom

housing. Sometimes it is convenient to of the control panel. Incoming conduitsinstall this cover pipe prior to raising the can be terminated in a removable plate inhousing into position on the breaker

If the mechanism and housing are tank. Next install the vertical operatingshipped separately, or the mechanism and ro( j, The length of the operating rodhousing have been removed from the be adjusted by means of right- and left-breaker for shipment, then it is necessary hand threaded couplings on the ends toto fasten the mechanism and housing in obtain the required breaker adjustmentposition.

MOUNTINGthe housing floor directly under theterminal boards. This plate can be drilledto suit any conduit requirements. It isrecommended that all conduits enteringthe mechanism housing be sealed off attheir entrances to the housing.

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asdescribed in the breaker instruction book.

ADJUSTMENTSThe breaker frame to which the oper-ating mechanism is to be mounted shouldfirst be plumb. This procedure is describedin the breaker instruction book. By mounted, electrical connections can beplacing a plumbed straight edge extending made. Before making these, precautionsfrom top to bottom against the mech- should be taken to see that all leads to beanism mounting pads on the breaker connected to the mechanism are de-framework, determine the amount of energized,shim washers needed to make them allflush. To this amount add an equalnumber of shims to each of the pads so as it is practicable. Control wires must bethat there is a nominal one-quarter inch run separately and remote from highthickness of shims. A single brass washer tension leads and not in the same duct oris to be placed between the steel washers parallel to high tension leads unless theand the mechanism housing and against distance separating the two sets of wiringthe gasket for more effective sealing is sufficient to prevent posssible commun-against the entrance of water. It may be ication between them as a result of shortnecessary to add or remove steel shims to circuits.

CONNECTIONSAlthough the mechanism has been

adjusted and tested at the factory, it isadvisable to check all the following pointsas well as those listed under FINALINSPECTION to be sure that no changehas occurred during shipment and instal-lation. No adjustments should be alteredunless this inspection indicates it is neces-sary.

9 After the mechanism has been

Rim control wires in conduit insofar

Use manual operation for all pre-liminary inspection. After the mechanismis connected to the breaker, operate itslowly to see that the operation is smooththroughout the closing stroke, that nobinding occurs, and that no excessive play

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When the springs have reached the Fig. 2, no longer is advanced. The closingfully charged position the indicator (7)} spring blocking device (13), Fig. 2, canFig. 2, will read “CHARGED”, and the now be removed, DO NOT OPERATEdriving pawl (4), Fig. 5 , will be raised OR PUSH THE MANUAL CLOSE BUT-from the ratchet wheel teeth, Additional TON (24), FIG. 2, WHILE THE BREAK-turning of the eccentric will not advance ER IS IN THE CLOSED POSITION,

the ratchet wheel . The latching and safety Damage to the linkage, ratchet wheel andpawls (16), Fig, 3, work in conjunction pawls might occur, This damage would bewith the driving pawl (4), Fig. 5 , to pre- caused by the energy of the springs notvent the ratchet wheel (73) , Fig. 10, from being absorbed by the mechanism linkageturning backwards due to the force of the and breaker in the spring hitting a station-closing springs as the ratchet wrench (7), ary linkage instead of pushing a movableFig. 5, is operated . linkage.

Insert the spring blocking device bar(13), Fig. 2, into both springs and man-ually discharge the springs against thepins by pushing the manual close button(24), Fig. 2. The springs are now blockedand slow closing of the breaker contactscan be accomplished by again turning thedriving eccentric with a 5/8 ratchetwrench.

is noticeable between parts. Electricaloperation should be attempted only afterit is certain that all mechanism adjust-ments are made correctly and that the oilcircuit breaker is correctly adjustedaccording to its instructions.

The breaker and mechanism adjust-ments must be checked when the mech-anism is being manually closed since themechanism can only be operated slowlyin the closing direction.

UNDER NO CIRCUMSTANCESSHOULD THE BREAKER BE TRIPPEDM A N U A L L Y O R ELECTRICALLYWITHOUT OIL IN THE TANKS UNTILTHE PROPER BREAKER INSTRUC-TION BOOK HAS BEEN CHECKED TODETERMINE WHETHER OR NOT THEBREAKER CAN BE OPERATED WITH-OUT OIL IN THE TANKS.

Operate the circuit breaker electri-cally several times. Check the controlvoltage as described under CONTROLPOWER CHECK.

NOTE: If the breaker sec-ondary wiring is to be given ahi-potential test at 1500 voltsa-c, remove both the majorleads from the terminal con-nection. Failure to disconnectthe motor from the circuitmay cause damage to thewinding insulation.

The spring blocking device is made toextend out the right door and must beremoved in order to close the door. Thisis to prevent leaving the mechanismblocked accidentally after maintenance.Each mechanism is furnished with ablocking device and should remain in thebottom of the house since the springcenters may differ from unit to unit.

Manual operation of the mechanismshould not be attempted until the bearingsurfaces of the mechanism have beenchecked for lubrication. Refer to thesection on lubrication for the proper oilsand greases. TRIP LATCH WIPE

MANUAL OPENING Refer to Fig. 10 and to “U”, Fig. 13,

The wipe of the trip latch (50), Fig. 10,on the trip latch roller (52) should befrom 3/16 inch to 1/4 inch. This can bemeasured by putting a film of grease onthe latch (50), closing the breaker part

The breaker can be tripped manuallyby operating the manual trip level (4),Fig. 3. This will give an opening operationvery similar to that obtained .when thebreaker is tripped electrically, The break-er cannot be opened slowly, except withan optional maintenance jacking device.

During the slow closing operationcheck to insure that the mechanism doesnot stick or bind during the entire stroke ,that it latches securely in the closedposition, and that it trips freely when the way, and tripping. The mechanism hasmanual trip lever (19), Fig, 2 , is operated , the proper trip latch wipe when the latchThe breaker should not be operated elec- rests against the stop pin (53). No adjust-fcricaUy until it has been operated several ment is provided and a visual inspection istimes manually to insure freedom of usually all that is required. If this settingaction. At this time, also check the is not correct , look for insufficient travelbreaker adjustments as given in the of the trip shaft (24),

breaker instruction book.

MANUAL CLOSINGDISCONNECT THE POWER TO

THE SPRING-CHARGING MOTOR TOPREVENT ITS OPERATION BEFOREOPERATING THE BREAKER MANU -ALLY AND ALSO BEFORE MAN -UALLY CHARGING THE CLOSINGSPRINGS.

To operate the mechanism manuallycharge the breaker closing springs (12)and (28), Fig. 2, manually using a 5/8inch ratchet wrench on the manual charg-ing stud (26), Fig. 2, to turn the drivingeccentric '(25), Fig. 2. Turning the drivingecce n t r ic coun te rclockwise (pushingdownward on the ratchet wrench), willadvance the ratchet wheel (22) and com-

-•*' press the closing springs.

WHEN WORKING ON THE MECH -ANISM IN THE CLOSED POSITION ,KEEP FINGERS CLEAR OF THE LINK-A G E , AS ACCIDENTAL TRIPPINGCAN CAUSE SEVERE INJURY.

Use the trip latch blocking pin toolwhich is inserted in the trip latch block-ing pin hole (100), Fig. 9 and Fig. 12 and(24) , Fig, 3, until it extends beyond theopposite frame.

DO NOT WORK ON EITHER THEBREAKER OR MECHANISM UNLESSTHE CLOSING SPRINGS AND TRIP-LATCIi ARE BLOCKED. THIS PRE-CAUTION IS REQUIRED TO PREVENTACCIDENTAL CLOSING OR TRIP-PING. USE THE 69 LOCK-OUT SWITCHIF REMOTE CONTROL IS USED.

After the adjustments have beenchecked, the springs can be unblocked.Rotate the driving eccentric (25), Fig. 2 ,until the indicator (7), Fig. 2, reads“CHARGED” and the ratchet wheel (22), 13, and “N”, Fig. 14. With the breaker in

TRIP LATCH CLEARANCE -rc

Refer to Fig, 12, and to “R”, Fig ,

6




will lock the eccentric. Tighten the lock-nuts on the eccentric after adjusting theeccentric.

oPROP CLEARANCE

Refer to (38), Fig. 10, and to “V”Fig. 13. With the breaker closed as far aspossible, that is, with the springs (79),and (62), Fig. 11, blocked and the cam(39), Fig. 10, rotated so that the camfollower roller shaft (68) is at its maxi-mum height over the prop (38), the clear-ance between the prop and cam shaftshould be 1/16 inch to 5/32 inch. Noadjustment is provided and a visualinspection is usually all that is required.

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PROP WIPEON 7<Ns00 Refer to Fig. 10 and “K”, Fig. 13.

With the breaker closed and the linkageresting on the closing prop (38), Fig. 10,the prop wipe should be 3/16 inch to 3/8inch from the cam follower roller shaft(68), Fig. 10, to the edge of the prop. Noadjustment is provided and a visualinspection is usually all that is required.

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12 CLOSING LATCII WIPE13 Refer to Fig. 9 and to UX” Fig. 15.

The wipe between the closing latch (8)and the closing latch roller (29) should be3/16 inch to 1/4 inch. If resetting isrequired, loosen, set , and retighten theadjustment screw (10), then tighten thelocking nut (11).

1. Mechanism House2. House Support Bracket3. Lock-out Device (69 Switch)4. Manual Trip Lever5. Manual Trip Push Rod6. Trip Latch Clearance Adjustment

Eccentric1,..̂ Manual Close Push Rod8, Eccentric9. Manual Charging Stud

. (5/8 inch hex)10. Driving Link11. Right Closing Spring

12. Closing Spring BlockingDevice

13. Access Plate (Customer’s Wiring)14. Output Crank Main Shaft15. Output Coupling16. Latching And Safety Pawls17. Ratchet Wheel18. CamShaft19. Guide Block20. Closing Coil (52CC)21. Closing Coil Plunger

Instruction Book23. Weatherstrip24. Trip Latch Blocking Pin

CLOSING LATCH MONITORINGSWITCH

Refer to Fig. 9 and to “T”, Fig. 13.The closing latch (8) must be fully resetand the closing latch monitoring switch(16) operated before the motor (34) willstart. The closing latch monitoring switchshould be wiped by the operating lever(23), Fig. 2, so that the clearance be-tween the operating lever and the switchmounting bracket (8), Fig. 6, is 0.005 to0.032 inch. To obtain this adjustmentbend the monitoring switch operating

the tripped position and the closing locknut (84), Fig. 12, at the trip latch Jcver as necessary. Be sure the latch issprings (12) and (28), Fig. 2, charged, clearance adjustment eccentric (6), Fig. 3, reset before making any ad-check the clearance between the trip with the breaker in the tripped position, justments.latch (50), Fig. 11, and the trip latch Adjust the eccentric (25), Fig. 2, as neces-roller (52), It should measure 1/32 inch sary. Adjust the trip latch clearance byto 3/32 inch. turning the eccentric in a clockwise direc-

~ . .. ,. . , t tion while decreasing the clearance. ThisTo change the adjustment loosen the

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Fig. 3 Right Side View of Mechanism

MOTOR LIMIT SWITCHES

Refer to Fig. 9 and to “Z”, Fig. 15.With the closing springs blocked rotate

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Trip Latch Checking SwitchTrip Latch ShaftCharge-discharge Indicator LinkageCharge-discharge IndicatorSwitch Support BoltsMotor Limit Switch SupportMotor Limit SwitchesMotor Limit Switch StrikerClosing LatchControl PanelControl House Heater Circuit

Fused PulloutCutoff and Anti-pump Relay (52Y)Trip Latch Blocking PinMotor Circuit Fused Pullout (WhenRequired)

19.20.21 .1, Output Coupling

2* Limit Switch Cam3. CamShaft4. Closing Circuit' Fused Pullout5. Trip Circuit Fused Pullout

6. Terminal Boards7. Control House Heater8. House Support Bracket9. Auxiliary Switch

10. Prop Reset Spring

Fig. 4 Left View of Mechanism

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Spring charged Operating Mechanism Type ML-14-0 GEK 7153

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Manual Close Push RodSpring-charging MotorRatchet WheelDriving PawlMotor Mounting Bolts

1. 6. Eccentric7. Manual Charging Stud

(5/8 Inch Hex)8. Driving Link9. Motor Support and Bearing Housing

2.3.4.5.

Fig, 5 Driving Elements

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GEK 7153 Spring-charged Operating Mechanism Type ML- 14-0

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6. Manual Charging Stud and Wrench7. Driving Link8. Monitoring Switch Mounting Bracket9. Closing Coil (52CC)

10 , Closing Coil Plunger

1. Motor Support Bolts2. Driving Motor3. Closing Latch Monitoring Switch4. Ratchet Wheel5. Eccentric

Fig. 6 Closing Devices

is closed , No adjustment is provided and avisual inspection is usually all that isrequired. If for some reason the auxiliaryswitch is removed it must be properlyreinstalled. The “V” stamped on theSB*12 auxiliary switch shaft must pointtoward the switch terminals or 180degrees away from the terminals to pre-vent overlap of the contacts. If “a” and“b” contacts overlap somewhat duringthe breaker stroke the auxiliary switch isassembled incorrectly and must beproperly reset , Remove the switch oper-ator from the square shaft. Rotate thesquare shaft until the arrow on the end ofthe shaft is pointing toward the upperfront corner of the switch mounting platewith the breaker in the open position.Install the switch operator and makecertain there is no overlap between the“a” and “b” contacts during the breakerstroke.

er stroke is increased by lowering thedashpots and/or the toggle setting at itsminimum (FKA) and/or internal stops attheir minimums (FK) and/or shorteningof the vertical operating rod.AUXILIARY SWITCH - TYPE SB-12

Refer to Fig. 11 and to “L”, Fig. 15.The auxiliary switch (19), Fig. 11 , ismounted on the left side of the operatingmechanism frame (2). The linkage (59)attached to the pin (40), Fig. 10, of theoutput crank (4) operates the auxiliaryswitch shaft which opens and closes the

“a” and "b” contacts. The “a” contactsare open when the breaker is open andthe “b” contacts are open when thebreaker is closed . The “a” contacts needonly to be checked to make certain theyare open when the breaker is open. The“b” contacts need only to be checked tosee that they are open when the breaker

the switch cam (6) until the motor limitswitch striker (26) has traveled themaximum amount (about 180 degreesrotation of the cam). Loosen themounting bolt (28) and rotate the switchsupport (16) , Fig. 4, until the gap be-tween the motor limit switch striker (26) ,Fig. 9, and the switch support (16), Fig.4, is 0.032 to 0.005 inch.

CLOSING CAM CLEARANCE

Refer to Fig. 18. The sum of "C”plus “R” should not exceed 0,170 inch.This clearance is affected by the adjust-ment of the breaker opening dashpots,toggle setting (FKA), internal stops (FK),and vertical operating rod length. Normal-ly no adjustment is required; however,this clearance should be checked if thebreaker settings are changed, The closingcam clearance is reduced when the break-10




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Operation CounterMain Output CrankTrip Coil PlungerTrip Latch Checking SwitchTrip Latch Checking Switch

Operating LeverTrip Shaft Retaining Cotter PinTrip LatchTrip Latch Stop PinTrip Coil Support Bracket

1. Trip Coil Positioning ShimsTrip CoilTrip Coil Positioning ShimsLock-out Device (69 Switch)Trip Coil LinkTrip CrankTrip Crank Adjustment BoltManual Trip LeverTrip Latch ShaftTrip Latch Set Screw

10.2. 11 .3. 12 .4. 13.5. 14.

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6 . 16.7. 17.8. 18.9. 19.

Fig. 7 Tripping Devices

11



GEK 7153 Spring-charged Operating Mechanism Type ML- 14-0

6. Closing Latch7. Control Panel Shock Mount8. Charge-discharge Indicator Linkage9. Charge-discharge Indicator

10 . Motor Limit Switch Striker11 . Charging Motor Limit Switches12. Motor Lead Terminal Board13. Control Wiring14. Spring-charging Motor

1 . Limit Switch Cam2. CarnShaft3. Guide Block4. Closing Latch Roller5 . Closing Latch Shaft

Fig . 8A Closing Latch and Motor Control

DRIVING AND LATCHING PAWLADJUSTMENT

veled through its return stroke and check to adjust the motor mount for properthe maximum driving clearance between ratcheting. This corresponds to a 0.015the driving pawl and the ratchet tooth inch clearance between the tip of the“Q”, Fig, 14. Rotate the charging wrench ratchet tooth and the tip of the pawl asuntil the driving pawl has advanced the the paw) falls past the ratchet tooth ,

If for some reason the 0,040 inchclearance cannot be maintained a some-what less amount is satisfactory providedthe mechanism will slowly close thebreaker when operated manually or closethe breaker normally when operated elec-trically and that the springs can becharged manually or electrically.

Refer to Fig. 12 and to “P” and "Q” ,Fig. 14. The driving pawl (74), Fig. 12 ,must advance the ratchet wheel (73)sufficiently on each stroke to allow thelatching pawl (70) to fall into the ratchetteeth of the ratchet wheel . This should bechecked with a major portion of the closingspring load against the driving members.With the mechanism unblocked , manuallycharge the closing springs with themanual charging wrench (7), Fig . 5 , untilthey are slightly more than half charged ,

Slowly rotate the charging wrench untilthe driving pawl (74), Fig. 12 , has tra-

ratchet tooth to its maximum travel . Nowcheck the latching clearance between theratchet tooth and the latching pawl (70),“P” , Fig. 14. The clearance should beapproximately equal for both the drivingand latching pawls and not less than0.040 inch in either case when a feelergage is inserted to approximately one-halfthe depth of the ratchet tooth and be-tween the driven portion of the ratchettooth and the flat above the tip of the pawl the closing springs must first bepawl , 0.040 inch is a good place to start fully charged and blocked. Remove roll

If adjustment is required for either

12



Spring-charged Operating Mechanism Type ML-14-0 GF,K 7153

Cam ShaftGuide BlockClosing Latch RollerClosing Latch ShaftClosing LatchControl Panel Shock Mount

2. 9. Charge-discharge Indicator10. Charging Motor Limit Switch Striker11. Charging Motor Limit Switches12. Motor Lead Terminal Board13.. Control Wiring14. Spring-charging Motor

16. Closing Latch Wipe Adjusting Screw17. Closing Latch18. Closing Coil Plunger19. Trip Latch Safety Rod20. Motor Limit Switch Adjusting

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3.4.5.6.7.

Fig. 8B Mechanism Open - Trip Latch in Place (Springs Discharged)

JjOvj pin from right side of motor mountingplate by driving the pin through the sideplate. Loosen the motor mounting bolts(5), Fig. 5, and move the entire motorassembly to the rear toward the breakertanks if the clearance is under the mini-mum at the latching and safety pawls,and, to the front away from the breakertanks if the clearance is under the mini-mum at the driving pawl. Move the motorassembly approximately twice the dimen-sional increase required at the pawl. Movethe entire motor and motor-mount assem-bly in 1/64 inch increments as a smallmovement here results in a large move-ment at the pawls. Be certain the motor

have a 0.015 to 0.030 inch clearanceabove the teeth of the ratchet wheel (73)when the closing spring (62) and (79),Fig. II , are completely charged, “H”,Fig. 14. This is checked with the closingsprings completely closed and gagged bymeasuring the distance between the out-board latching pawl and the ratchet toothwith the pawl raised as high as possible.This is adjusted by loosening the locknut(86), Fig. 12, and adjusting the latchingand safety pawls' adjustment screw (69),Fig. 12 , as necessary. The safety pawl(inboard of the latching pawl) will thenhave up to a 0.060 inch clearance morethan the latching pawl.

assembly i$‘ moved straight forward orrearward and tighten the one bolt on theright side of the mounting frame first toassure proper alignment. After tighteningthe remaining bolts the springs should bereleased and the clearance again checkedas described above. Redrill and pin in thesame area to prevent movement.LATCHING PAWL TO RATCHETWHEEL CLEARANCE

Refer to Fig. 12 and to “H”, Fig. 14.The latching pawl (70), Fig. 12 (which isthe outboard pawl at this location) must

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GEK 7153 Spring-charged Operating Mechanism Type ML- J 4-0

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1. Mechanism House Support Bracket2. Mechanism Frame3. Output Crank Main Shaft4. Output Crank5. Prop6. Limit Switch Cam7. Cam Shaft8. Closing Latch9. Closing Latch Shaft

10. Closing Latch Wipe Adjusting Screw11. Closing Latch Wipe Adjusting Screw

Locknut12. Closing Latch Monitoring Switch

Operating Lever13. Closing Coil14. Closing Coil Support Bracket

30. Motor Limit Switches31. Motor Support Bracket32. Motor Support Bracket Bolts33. Manual Close Push Rod Button34. Spring-charging Motor35. Mechanism Frame Tie Rod36. Vertical Operating Rod Lower

Coupling37. Cam Follower Roller38. Closing Prop39. Cam40. Linkage to Output Crankshaft41. Upper Link42. Trip Coil43. Trip Coil Plunger44. Lock-out Switch (69 device)45. Trip Coil Linkage

15. Closing Coil Plunger16. Closing Latch Monitoring Switch17. Closing Latch Spring18. Operation Counter19. Auxiliary Switch20. Prop Reset Spring21. Stop Pin22. Trip Latch Checking Switch23. Trip Latch Checking Switch

Operating Lever24 Trip Latch Shaft25. Charged-discharged Indicator26. Motor Limit Switch Striker27. Link Shaft28. Motor Limit Switch Support Bolts29. Closing Latch Roller

7’ Fig. 9. Left Side View of the Mechanism Linkage in the Latch Closed Position(Spring-charged)

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4946. Mechanism Frame Tie Rod 84. Trip Latch Clearance Adjustment

Locking Nut85. Vertical Operating Rod Locking

65. Trip Coil Support66. Trip Coil Shims67. Prop Spacer and Reset Spring

47. Trip Latch Spring48. Trip Crank49. Lower Link50. Trip Latch51. Trip Latch Guide Roller52. Trip Latch Roller53. Trip Latch Stop Pin54. Trip Latch Roller Shaft55. Trip Latch Assembly Support

BoltPin86. Latching and Safety Pawls

Adjustment Locknut87. Driving Pawl Return Spring88. Cam Shaft Bearing89. Mechanism House Adjusting

Bolt and Locknut90. Closing Latch Bearing91. Left Guide Block Bearing92. Right Guide Block Bearing93. Sprocket94. Driving Chain95. Driving Eccentric Bearing96. Driving Link Bushing97. Driving Pawl Bushing98. Driving Crank Bushing99. Sprocket Shaft Bushing

100. Trip Latch Blocking Pin Hole101. Locking Nut102. Trip Latch Roller Shaft Bearing

68. Cam Follower Roller Shaft69. Latching and Safety Pawls

Adjustment Screw70. Latching Pawl71. Trip Coil Linkage Adjustment

Allen Head Bolt72. Manual Trip Lever73. Ratchet Wheel74. Driving Pawl75. Driving Crank76. Driving Eccentric77. Manual Charging Stud78. Driving Link79. Right Closing Spring80. Motor Support Bracket81. Right Closing Spring

Blocking Device82. Manual Trip Adjusting Bolt83. Manual Trip Locking Nut

Link56. Trip Latch Clearance Adjustment

Eccentric Shaft57. Trip Latch Assembly Support

Link Spring58. Breaker Vertical Operating Rod59. Auxiliary Switch Operating Linkage60. Trip Latch Checking Switch Support61. Guide Block62. Left Closing Spring63. Closing Spring Support64. Left Closing Spring Blocking

Device

Fig. 10 Left Side Sectional View of the Mechanism Linkage in the Latch Closed Position

15



GEK 7153 Spring-charged Operating Mechanism Type ML 14 0

Mechanism House Support BracketMechanism FrameOutput Crank Main ShaftOutput CrankPropLimit Switch CamCain ShaftClosing LatchClosing Latch ShaftClosing Latch Wipe Adjusting ScrewClosing Latch Wipe Adjusting Screw

LocknutClosing Latch Monitoring Switch

Operating LeverClosing CoilClosing Coil Support BracketClosing Coil PlungerClosing Latch Monitoring SwitchClosing Latch SpringOperation CounterAuxiliary SwitchProp Reset SpringStop PinTrip Latch Checking SwitchTrip Latch Checking Switch

Operating LeverTrip Latch ShaftCharged-discharged IndicatorMotor Limit Switch StrikerLink ShaftMotor Limit Switch Support BoltsClosing Latch RollerMotor Limit SwitchesMotor Support BracketMotor Support Bracket BoltsManual Close Push Rod ButtonSpring-charging MotorMechanism Frame Tie RodVertical Operating Rod Lower

CouplingCam Follower RollerClosing PropCamLinkage to Output CrankshaftUpper LinkTrip CoilTrip Coil PlungerLock-out Switch (69 device)Trip Coil LinkageMechanism Frame Tie RodTrip Latch SpringTrip CrankLower LinkTrip LatchTrip Latch Guide RollerTrip Latch Roller

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§Pig. 11 , Front View of the Mechanism in the Latch Closed Position

16



Spring-charged Operating Mechanism Type ML-14-0 GEK 71S3

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53. Trip Latch Stop Pin54. Trip Latch Roller Shaft55. Trip Latch Assembly Support

85. Vertical Operating Rod Locking69. Latching and Safety Pawls

Adjustment Screw70. Latching Pawl71. Trip Coil Linkage Adjustment

Allen Head Bolt72. Manual Trip Lever73. Ratchet Wheel74. Driving Pawl75. Driving Crank76. Driving Eccentric77. Manual Charging Stud78. Driving Link79. Right Closing Spring80. Motor Support Bracket81. Right Closing Spring

Blocking Device82. Manual Trip Adjusting Bolt83. Manual Trip Locking Nut84. Trip Latch Clearance Adjustment

Locking NutFig. 12 Right Side View of the Mechanism in the Latch Closed Position

Bolt86. Latching and Safety Pawls

Adjustment Locknut87. Driving Pawl Return Spring88. Cam Shaft Bearing89. Mechanism House Adjusting

Bolt and Locknut90. Closing Latch Bearing91. Left Guide Block Bearing92. Right Guide Block Bearing93. Sprocket94. Driving Chain95. Driving Eccentric Bearing96. Driving Link Bushing97. Driving Pawl Bushing98. Driving Crank Bushing99. Sprocket Shaft Bushing

100. Trip Latch Blocking Pin Hole101. Locking Nut102. Trip Latch Roller Shaft Bearing

Link56. Trip Latch Clearance Adjustment

Eccentric Shaft57. Trip Latch Assembly Support

Link Spring58. Breaker Vertical Operating Rod59. Auxiliary Switch Operating Linkage60. Trip Latch Checking Switch Support61. Guide Block62. Left Closing Spring63. Closing Spring Support64. Left Closing Spring Blocking

Device65. Trip Coil Support66. Trip Coil Shims67. Prop Spacer and Reset Springm Pin68. Cam Follower Roller Shaft

17




This can also be checked by mea-suring the distance between the bottomof the latching and safety adjustmentscrew and the top surface of the latchingpawl when the closing springs are com-pletely charged .TRIP LATCH CHECKING SWITCH

Refer to Fig, 10 and to “Y” and“W”, Fig. 15. Rotate the trip latch (50),Fig. 10, clockwise (looking at the left sideof the mechanism) by pressing themanual trip lever (17), Fig. 7, to open thelatch checking switch operating lever(23), Fig. 9. Allow the trip latch to resetslowly and determine the point at whichthe contacts of the trip latch checkingswitch (22) make by using a circuitcontinuity tester, such as a light indicatoror bell set . The contacts of the trip latchchecking switch should just make whenthere is a 1/16 inch gap between the triplatch (50), Fig. 10, and the stop pin (53)located on the trip latch assembly sup-port link (55). There should be a min-imum of 1/64 inch between the operatinglever (5), Fig. 7, and the trip latchchecking switch (22), Fig. 9. Bend thetrip latch checking switch operating lever(23), Fig. 9, as necessary to adjust.

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COTRIP COIL PLUNGER

toRefer to Fig. 10 and “S’\ Fig, 13.

The plunger (43) of the trip coil (42)must have a minimum of 1/8 inch freetravel before the trip latch (50) starts tomove to provide proper tripping atreduced voltages. This is adjusted byloosening the Allen set screw which islocated in the trip latch shaft (24). Thisset screw bears against the Allen headbolt (71), Fig. 11, securing the bolt inplace. Rotate the trip crank (48), Fig. 10,about the trip latch shaft until the correctfree travel of the trip coil plunger isobtained. Adjust the Allen head bolt tocontact the trip crank at this point.Install the Allen screw from the front sideof the trip latch shaft from the front sideof the trip latch shaft then tighten theAllen head adjusting bolt (71), Fig. 11*

This free travel must be sufficient so thatthe breaker is able to trip at its minimumtrip voltage. The values are in a chartunder FINAL INSPECTION.

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Fig. 13 Adjustment and Final Clearance Checks

18



Spring-charged Operating Mechanism Type ML14-0 GEK 71S3

direction , Tighten the locknut afteradjusting.RECLOSING TIME* DELAY RELAY(79X)

This relay is an optional feature forthose who desire an adjustable reclosingoperation.

The reclosing cycle must be set up sothat the breaker contacts open at leastthe minimum distance which is given inthe breaker instruction book before thecontacts start to reclose , The point at

. which they start to reclose is determinedby the breaker opening speed and thesetting of the time-delay relay whichinitiates the reclosing circuit. The oper-ating voltage is given on the breakernameplate and the proper opening andclosing speeds are given in the breakerinstruction book.

FINAL INSPECTION

After the mechanism has been install-ed with all mechanical and electrical

Fig. 14 Right Side View Adjustment and Final Clearance Checks

£ CLOSING COIL PLUNGERN"j*

. g Refer to Fig. 9 and “F”, Fig. 15. Thepj closing coil plunger (15) of the closing

- p coil (13) must have a minimum of 1/8inch free travel before the tang of the

5; closing latch is contacted . If this freetravel is less than 1/8 inch , remove thecoil and file the plunger (18), Fig. 8B,until it has 1/8 inch free travel.

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1 MANUAL TRIP LEVER

Refer to Fig. 2 and “M”, Fig. 14.The manual trip lever (19), Fig. 2, mustbe adjusted so that when the push button(21), Fig. 2, is activated the mechanismtrips and the 69 device (17), Fig, 2, isoperated. This is adjusted by looseningthe locknut (83), Fig. 12, and turning theadjusting bolt (82), Fig. 12, in the proper Fig. 14A Sectional View Showing Adjustment P

19




connections completed, make the follow-ing inspection and test: 'Nt' y*>0)

&A. See that the mechanism is prop- ^erly set up and securely fastenedto the breaker framework. £ •

>B. Review the following adjust- -

meats: 03>_C. Check that all bolts, nuts and

screws are properly tightened 2and that all washers and cotter gpins are in place with cotter pinends effectively bent over. ooo

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D. Inspect all wiring for damage 2during installation work, check ^terminal connections for loose ^screws, and test for possiblegrounds or short circuits.

E. See that all bearing surfaces and ^<DP4o

Fig. 14B Sectional View Showing Adjustment Q

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Fig. 14C Sectional View ShowingAdjustment H Fig. 15 Left Side View Adjustment and Final Clearance Checks

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A 1. Trip latch wipe (with trip latch resting against stop pin) . .2. Trip latch clearance3. Trip latch nominal clearance4. Closing prop clearance5. Closing prop wipe6. Closing latch wipe7. Closing latch monitoring switch (“CL/MS”) clearance . ,

8. Motor limit switches (“SM/LS”) maximum clearance. . .9. Driving pawl minimum driving clearance

10. Latching pawl minimum latching clearance11. Latching pawl-rachet wheel clearance . . . . . . . .

The driving pawl and latching pawl clearance should be approximately equal.12. Trip latch checking switch (“lc”) minimum clearance . . . . (Y Fig. 15)13. Trip latch checking switch (“lc”) contacts just make when the gap between

the trip latch and the stop pin is . .14. Trip coil plunger free travel minimum ,

15. Closing coil plunger free travel minimum16. Anti-condensation heater

. (U Fig. 13)

. (R Fig. 13)

. (R Fig. 13)• (V Fig. 13). (K Fig. 13). (X Fig. 15)

. . (T Fig. 13)

. , (Z Fig. 15)

. . (Q Fig. 14)

. . (P Pig - 14)

. . (H Fig. 14)

3/16 inch to 1 /4 inch1/32 inch to 3/32 inch0.045 inch1/16 inch to 5/32 inch3/16 inch to 3/8 Inch3/16 inch to 1/4 inch0.005 to 0.032 inch1/32 inch0.040 inch0.040 inch0.015 to 0.030 inch

1/64 inch

(W Fig. 15) 1/16 inch1/8 inch1/8 inchfunctioning continuously

(S Fig. 13)(F Fig. 15)

the cylinder are properly lubri-cated. (Refer to OPERATIONAND MAINTENANCE.)

ClosingRange

TrippingRange

J , Check that the ground connec-tions are properly made andtightened.

K. Make certain that all pipe plugsand bolted connections areproperly tightened and that allcovers and gaskets are properlyinstalled to prevent entrance ofmoisture.

§3NominalVoltage Mini* Maxi-

mum mumMini- Maxi-mum mum

F. Operate the breaker slowly withthe manual charging wrench andnote that there is no excessivebinding or friction and that thebreaker can be moved to thefully opened and fully closedpositions.

36 - 52v d-c90 - 130v d-c

180 - 260v d-c95 - 125v a-c

190 - 250V a-c

48v d-c125v d-c2S0v d-c115v a-c230v a-c

28 - 60v d-c70 - 140v d-c

140 - 280v d-c95 - 125v ac-

190 - 250v a-cIf the closed circuit voltage at the

terminals of the coil or motor does notfall in the specified range, check thevoltage at the source of power and linedrop between the power source andbreaker.

L. Reset the 69 switch if remotetripping is used.G. Operate the mechanism electri-

cally and check the followingpoints:

CONTROL POWER CHECKa. Closing, opening, reclosing

and trip-free times. After the mechanism has been closedand opened slowly several times with themaintenance closing wrench and themechanism adjustments are checked asdescribed, the closed circuit operatingvoltages should be checked at the releasecoil, trip coil, and motor terminals. Forelectrical operation of the mechanism,the control power may be either an alter-nating or direct current source. Theoperating ranges for the closing and trip-ping voltages are given on the breakernameplate. The following ranges arestandard:

When two or more breakers oper-ating from the same control power sourceare required to dose simultaneously, theclosed circuit voltage at the closing coil ormotor of each breaker must fall withinthe specified limits.

Electrical closing or opening isaccomplished by energizing the closing ortrip coil circuit. It is also possible to tripor close the breaker manually by pressingthe manual trip lever (19), Fig. 2, or themanual close button (24).

b, Minimum trip and closingvoltage.

H. vSee that all points where thesurface of the paint has beendamaged during installation arerepainted immediately.

I. Make a final check that thebreaker is securely fastened toits foundation and properlyleveled.

21

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GEK 7153 Spring-charged Operating Mechanism Type ML-14*0

OPERATION #The ML-14 operating mechanism isof the stored-energy type designed to givehigh speed closing and opening. Themechanism will operate on a-c or d-cvoltage. The operating voltage is indicatedon the breaker nameplate. Closing andopening operations are controlled elec-trically by the remote relaying, andmechanically by the manual close andtrip levers located behind the front doorof the mechanism house.

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SPRING CHARGINGT--<oQ

The mechanism consists of a highspeed gear motor (11), Fig. 2, thatcompresses a set of closing springs (12),and (28), through the action of a simpleeccentric (25), a ratchet wheel (22), andpawl (4), Fig. 5, assembly. The rotaryaction of the motor is converted to ashort straight stroke pumping actionthrough the eccentric and a driving link(8), Fig. 5, that carries a spring-loadeddriving pawl (4), Fig. 5.

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Fig. 16 Position of Linkage - Mechanism ClosedUndotted cam indicates closing spring charged.Dotted cam indicates closing spring discharged.

tThe driving pawl (4), Fig. 5, advancesthe ratchet wheel (17), Fig. 3, only a fewdegrees each stroke where it is held inposition by the latching and safety pawls(16), Fig. 3. When the ratchet wheel hasbeen rotated approximately 180 degreesthe closing springs (11) and (22), Fig. 3,will be fully compressed. As the ratchetwheel continues to rotate, the spring loadwill shift overcenter and attempt todischarge, but will be prevented fromdischarging by the closing latch (8), Fig.9. After only a few degrees of rotation,the closing latch roller (29), Fig. 9, willengage the closing latch (8), Fig. 9, andthe compressed springs will be held inrepose until a closing operation isrequired . During the last few degrees ofthe ratchet wheel rotation the motorlimit switches (17), Fig. 4, are releasedand the driving pawl (4), Fig. 5, is raisedfrom the ratchet wheel surface. Thisallows the motor and driving mechanismto coast to a natural stop expending allresidua! energy.

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During the time the springs are beingcompressed the cutoff and , anti-pumprelay 52Y (22), Fig. 4, locks the closingpower circuits open. The 52Y relay will

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Fig. 17 Position of Linkage - Mechanism Going Closed

22




remain energized until the springs arefully charged and the control and motorlimit switch (17), Fig. 4, contacts arereset .

The closing springs may be chargedmanually if control voltage is lost. Astandard 5/8 inch ratchet wrench shouldbe used to rotate the eccentric in acounterclockwise direction until theindicator reads “CHARGED” and thedriving pawl no longer engages the ratchetwheel. The use of the ratchet wrenchprovides for maximum safety in the eventthat control power is suddenly restoredwithout warning. In this event, the motordrive will take over again and continue to '

charge the springs while the ratchetwrench harmlessly turns in the unloadeddirection. Removing the fused pullouts(4), Fig. 4, will prevent the power frombeing applied when it is not required.

CLOSING OPERATION

Closing the breaker is accomplishedby energizing the closing coil (20), Fig. 3,or by manually pressing the close button(24), Fig. 2. In either case, the closinglatch (8), Fig. 9, is rotated away from theclosing latch roller (29), Fig. 9, per-mitting the springs to discharge. Theenergy of the springs is applied to therotation of a cam (39), Fig. 10, whichcloses the breaker through a simple link-age that remains trip free at all times. Amonitoring switch (3), Fig. 6, operatedby the closing latch (8), Fig* 9, will startthe spring-charging motor (34), Fig. 9,after it is fully reset .

Fig. 18 Position of Linkage - Mechanism OpenUndotted cam indicates closing spring charged *

Dotted cam indicates closing spring discharged.m

When the breaker is closed withoutpower to the spring or charging motor,the cam (39), Fig, 10, is in the position ofthe dotted cam shown in Fig. 16. This isdue to the motor not forcing the caminto the undotted cam position shown inFig, 16 since the motor did not startcharging the springs immediately uponclosing the breaker as it does during anormal closing operation when the motoris energized.

DO NOT OPERATE THE MANUALC L O S E B U T T O N W H E N THEBREAKER IS CLOSED. If the button is '

pushed, the energy stored in the springswill be dissipated against the stop pinFig. 19 Position of Linkage - Mechanism Going Open

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*—1_kl t,4>ft- i£ 8’i 1 a1. Output Crank Bushing

2. Output Crank Main ShaftBushing

3. Upper Link Bushing4. Lower Link Bushing5. Trip Latch Roller

Bushing6. Trip Latch Shaft

Bearing7. Guide Block Bearing

(Outer Race)8. Guide Block Bearing

(Inner Race)9. Cam Shaft Bearing

(Outer Race)10. Cam Shaft Bearing

(Inner Race)11. Closing Prop Bushing12. link Shaft Bushing13. Closing Latch Shaft

Bearing14. Driving Crank Bushing15. Driving Pawl Bushing16. Driving Link Bushing17. Driving Eccentric Shaft

Bearing (Outer Race)18. Driving Eccentric Shaft

Bearing (Inner Race)19. Latching and Safety Pawl

Bushing20. Driving Eccentric

Bushing21. Trip Latch Roller

Bearing (Inner Race)22. Trip Latch Roller

Bearing (Outer Race)23. Cam Follower Roller

Bearing (Inner Race)24. Cam Follower Roller

Bearing (Outer Race)

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NOTE: When replacing bronze bushings in the linkage frequently the bushings will require reaming to permit free rotation on theirpins or shafts. Measure the diameter of the shaft and ream the bushing 0.001 to 0.003 inch larger than the shaft after it is insertedinto place, e.g., the driving link bushing (16), Fig. 20, should be reamed to 0.748 to 0.750 inch since the shaft measures 0,746 to0.747 inch.

Fig. 20A Bushing and Bearing Location in Mechanism24




(21), Fig. 9, and the links (41), Fig. 10,causing bending of the pin and indenta-tions on the links. When closing thebreaker the energy in the springs is usedand the stop pin or links are notdamaged .

it does during a normal closing operationwhen the motor is energized.

the opening operation , the operatingmechanism is returned to its normalposition , ready for closing.

Manual tripping follows the sameprocedure except that instead of energi-zing the trip circuit , the manual trip lever(19), Fig. 2, is used . If the control houseis closed pushing the manual trip pushbutton (21), Fig. 2, on the surface of thefront door will trip the breaker. Themechanism cannot be operated slowlywhile opening.

mTRIP-FREE OPERATION

When testing the breaker the trip-freeoperation should be made by using thebreaker contacts to energize the trip-freecircuitry. This more closely simulates abreaker closing against a fault .

( f the trip coil is energized while thebreaker is closing, the trip coil plunger(3), Fig. 7, will force the trip latch (6),Fig. 2, away from the trip roller (20), Fig.2, causing the mechanism linkage tocollapse and the breaker to reopen. Theclosing cam (39), Fig. 30, will completeits closing stroke and the springs willrecharge as in a normal closing operation.The position of the mechanism linkageduring its operation is shown in Figures36, 17 and 18.

OPENING OPERATION

An electrical opening operation isinitiated by energizing the trip coil (15),Fig. 2. This is accomplished either byactuating a remote trip circuit or by acombination of relays and current devicesused to detect a fault on the load side ofthe breaker. When energizing the trip coil , being closed without charging the closingthe trip plunger rotates the trip latch(6), Fig. 2, causing the operating mech-anism linkage to collapse. The energystored in the breaker opening springs is the cam into the undotted positionthus released, opening the breaker, shown in Fig. 18- since the motor did notDuring this operation , the trip coii circuit start charging the closing springsis de-energized, and upon completion of immediately upon closing the breaker as

When the breaker is opened after

springs, the cam (39), Fig. 10, is in theposition of the dotted cam shown in Fig.18. This is due to the motor not forcing

MAINTENANCE3. Use the connection diagram

accompanying the operatingmechanism in all cases whentesting and connecting the mech-anism.

4, When making adjustments in themechanism or breaker makecertain that the closing springsare blocked as described underMANUAL CLOSING.

PERIODIC INSPECTION

The operating mechanism of an oilcircuit breaker is a very important partand must have regular systematic inspec-tion during which every part is lookedover carefully. The frequency of inspec-tions should be determined by eachoperating company on the basis of theservice to which the operating mechanismis subjected . Operating experience willsoon establish a maintenance schedulethat will give assurance of proper mech-anism condition, An annual inspectionand maintenance program is desirable inaddition to - a visual inspection at morefrequent intervals. These inspectionsshould be co-ordinated with an inspectionof the breaker parts for maximumconvenience.

Output crank to breaker-vertical operating rodshaft

Output crank main shaftLinkage to output crank shaftCam follower roller shaftTrip latch clearance

adjustment eccentric shaftTrip latch roller shaftTrip latch shaftCam shaftClosing latch shaftLink shaftStop pinDriving pawl pinDriving link pinGuide block pin (right side)Guide block pin (left side)Driving eccentric shaftDriving eccentric to sprocket

shaftLatching and safety shaftProp spacer and reset

spring pin

A.

B.C.D.

DO NOT WORK ON THEBREAKER OR MECHANISMWHILE IN THE CLOSED POSI -TION UNLESS THE PROPAND TRIP LATCH HAVEBEEN SECURELY WIRED QRBLOCKED TO PREVENTACCIDENTAL TRIPPING. DONOT W O R K O N T H EBREAKER OR MECHANISMWHILE THE SPRINGS ARECHARGED UNLESS THEYARE SECURED IN THAT POSI-TION BY THE MAINTENANCESPRING BLOCKING DEVICE.

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PRECAUTIONS1 , Be sure that all primary and

secondary circuits have beenopened and grounded before anyinspection or maintenance isattempted.

2. After any adjustment is made inthe mechanism, operate manu-ally to check the adjustmentbefore operating electrically.

N.O.P.R.S.U. 5. DO NOT OPERATE THE

MANUAL CLOSE BUTTONWHEN THE BREAKER IS INTHE CLOSED POSITION.Shaft and Pin Identification for Fig. 2.0A

25



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V 1. Output Crank Bushing2. Output Crank Main Shaft

Bushing3. Upper Link Bushing4. Lower Link Bustling5. Trip Latch Roller

Bushing6. Trip Latch Shaft

Bearing7. Guide Block Bearing

(Outer Race)8. Guide Block Bearing

(Inner Race)9. Cam Shaft Bearing

(Outer Race)10. Cam Shaft Bearing

(Inner Race)i1. Closing Prop Bushing12. Link Shaft Bushing13. Closing Latch Shaft

Bearing14. Driving Crank Bushing15. Driving Pawl Bushing16. Driving Link Bushing

j) 17. Driving Eccentric ShaftBearing (Outer Race)

18. Driving Eccentric ShaftBearing (Inner Race)

19. Latching and Safety PawlBushing

20. Driving EccentricBushing

21. Trip Latch RollerBearing (Inner Race)

22. Trip Latch RollerBearing (Outer Race)

23. Cam Follower RollerBearing (Inner Race)

24. Cam Follower RollerBearing (Outer Race)

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Fig. 20B Bushing and Bearing Location in Mechanism

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Spring-charged Operating Mechanism Type ML-14-0 GEK. 71S3

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&sH A. Output crank to breakervertical operating rodshaft

B. Output crank main shaftC. Linkage to output crank shaftD. Cam follower roller shaftE. Trip latch clearance

adjustment eccentric shaftF. Trip latch roller shaftG. Trip latch shaftH. Cam shaftI. Closing latch shaftJ. Link shaftK. Stop pinL. Driving pawl pinML Driving link pinN. Guide block pin (right side)O. Guide block pin (left side)P. Driving eccentric shaftR. Driving eccentric to sprocket

shaftS* Latching and safety shaftU. Prop spacer and reset

spring pin

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IE 5sc wi ?r

JL r* % "5

G- (jrr’sTs

U U r-Shaft and Pin Identification Ii» umcUr

• -J 0*h V LZ>fTT5

\12 — 12I

TfBKSSH

13-NOTE: When replacing bronze bushings in the linkage frequently the bushings will require reaming to permit free rotation on theirpins or shafts. Measure the diameter of the shaft and ream the bushing 0.001 to 0.003 inch larger than the shaft after it is insertedinto place, e.g., the driving link bushing (16), Fig. 20, should be reamed to 0.748 to 0.750 inch since the shaft measures 0.746 to0.747 inch.

Fig. 20C. Bushing and Bearing Location in Mechanism

27




A careful inspection should be madeto check for loose nuts or bolts andbroken retaining rings. All cam, roller,and latch surfaces should be inspected forany evidence of damage or excessivewear. Lubricate the mechanism as out -lined below, then, using the manualcharging wrench , open and close thebreaker several times to make certain thatthe mechanism operates freely through-out its entire stroke. Check the mech-anism adjustments as specified underADJUSTMENTS. Check all terminalconnections.

the terminal boards. Failure to disconnect packaged to insure cleanliness and tothe motor from the circuit may cause prevent oxidation,

damage to the winding insulation.METHOD OF CLEANING BEARINGS

LUBRICATION Whenever cleaning is required, asIn order to maintain reliable opera- indicated in the lubrication chart, the

tion, it is important that all mechanisms following procedures are recommended ,

be properly lubricated at all times. Mostof the bearings and rolling surfaces utilize SLEEVE BEARINGSa new type of dry lubrication that willrequire no maintenance and will last thelife of the equipment. Only a few bear-ings and surfaces listed in the chart , Fig.20, require lubrication. These have beenproperly lubricated during assembly atthe factory using the finest grades of lub-ricants available. However, even the finestoils and greases have a tendency tooxidize with age, as evidenced by harden-ing and darkening in color. Elimination ofthe hardened lubricant is essential for the

Some of the sleeve bearings usedthroughout the linkage are Textolite;others are bronze. If contaminants arepresent they should be removed byimmersing the link and bearing in cleanpetroleum solvent or similar cleaner andusing a stiff brush. Do not remove thebearings from the links. DO NOT USECARBON TETRACHLORIDE since itmay be injurious to the user.

OPTIONAL MAINTENANCE JACKINGDEVICE

The jacking device consists of tworods that attach to the pin securing thevertical operating rod coupling (36), Fig.10, and support a platform for a hydrau-lic jack. All of the sleeve bearings, for

example, the bearings of the main shaft(2), Fig. 20, and the bearing of thedriving link (16), should be cleaned andlubricated with G-K D50H15 lubricant atgeneral overhaul periods.

proper operation of circuit breakers.Also, frequent operation of the mech-anism causes the lubricant to be forcedout from between the bearing surfaces. Asimple lubrication will often dear upminor disturbances which might be mis-taken for more serious trouble.

Before installing rods and platformremove the breaker from service, dis-connect tire motor and control power,and discharge the closing springs by clos-ing the breaker or install the springblocking device. To install the jackingdevice, open the breaker and attach therods and platform to the operating rodpin and contain with a washer and cotterpin. Put the jack on the platform withshims underneath to remove clearancebetween the top of the jack and theframe

ROLLER AND NEEDLE BEARINGSA definite lubrication schedule All the roller and needle bearings, for

should be set up taking into consideration example, the cam follower bearings (23the frequency of operation of the mech- and 24), Fig. 20, trip latch roller bearinganism and local conditions. Until such a (21 and 22) and the cam shaft bearings (9schedule is worked out, the mechanism and 10) should be first removed from theshould be lubricated at each periodic mechanism and the inner race disas-inspection and also whenever it is over-hauled, in accordance with the lubrica-tion chart. It is also recommended that all

i

sembled. They should then be placed in Hcontainer of clean petroleum solvent orsimilar cleaner. DO NOT USE CARBONTETRACHLORIDE. If the grease in the

operating mechanisms be operated at bearings has become badly oxidized, itregular intervals to insure the user that nuay be necessary to use alcohol (the type

used for thinning shellac) to remove it ,Ordinarily, by agitating the bearings in

The lubrication chart is divided into the cleaning solution, and using a stiff 'dtwo methods of lubrication. The first brush to remove the solid particles, the %method outlines the maintenance lubri- bearings can be satisfactorily cleaned. Docation which should be performed at the not handle the bearings with bare handstime of periodic maintenance, andrequires no disassembly. The secondmethod outlines a lubrication procedure bearings are touched, the contaminationsimilar to that performed on the breaker can be removed by washing in alcohol ,

at the factory, but should be used only in After the bearings have been thoroughlycase of a general overhaul or disassembly cleaned, spin them in clean new lightfor other reasons, or if the operation of machine oil until the cleaner or solvent isthe breaker becomes slower.

The breaker may now be jackedclosed. The closed position is reachedwhen the props (19), Fig. 10, fall underpin (68). circuit breakers and their associated

To slowly open the breaker, hold themanual trip lever in initially and allow thejack to - slowly collapse by using therelease valve on the jack.

C A U T I O N : D O N O TATTEMPT TO OPERATETHE BREAKER WITH THISD E V I C E W H I L E T H EBREAKER IS ENERGIZED.

Remove the jack, rods and platformbefore returning the breaker to normaloperation.

the equipment is operating freely.

as deposits from the skin onto thebearings are inductive to corrosion. If the

entirely removed. Allow this oil to drainoff and then repack the bearings immed-

General Electric Lubricant D50H15 iately with G-E lubricant D50H15 beingis available in four-ounce collapsible sure all metal parts are greased . Anytubes, order as 6591901P1. It is so removable seals should then be replaced.

INSULATION TEST

If the breaker secondary wiring is tobe given a hi-potential test at 1500 voltsa-c, remove both the motor leads from

28




LUBRICATION ATMAINTENANCE

PERIODALTERNATE LUBRICATION(REQUIRES DISASSEMBLY)PART

Film of D S0H15 grease,No lubrication required ,Sleeve Bearings -Textolite Bearings -

!Remove bearings or links, clean perinstructions and apply D S0H15 grease liberallySleeve Bearings -

Bronze Bearings -Light application ofmachine oil SAE 20or SAE 30.I

i

Clean per instructions and repack with D 50H15grease.Roller and Needle Bearings - Light application of

machine oil SAE 20or SAE 30.

No lubrication required except a light film ofD 50H15 grease.No lubrication required

except a light film ofD 50H1S grease.

Wipe clean and applyD S0H15 grease,

Ground surfaces such as cams, ratchetteeth, etc. (Surfaces coated withM0S2)

Ground surfaces such as latches,rollers, prop, etc.

Wipe clean and apply D 50H15 grease

Replace when they, become sluggish.

Wipe dean and apply Texaco “All-Temp” or asimilar lubricant.

Sealed Bearings - trip latch roller shaft Cannot be relubricated.Motor Gear Box No lubrication normally

required, Lubricatewhen motor becomessluggish.

IllI1mW*l

LUBRICATION CHART

no maintenance and should last the life ofthe breaker.to personnel. Washing the

bearings in the light oil anddraining should followimmediately, then apply thelubricant.

Bearings that are pressed into theframe or other members such as theeccentric drive bearings contained in themotor support (9), Fig. 5* should not beremoved , After removing the shaft andinner race the bearing can usually becleaned 'satisfactorily with petroleumsolvent or a similar cleaner and a stiffbrush. Follow the procedure outlinedabove using a light machine oil and G-Elubricant D50H15 before reassemblingthe inner race and shaft.

NOTE: If it becomes neces-sary to clean the bearings inalcohol (shellac thinner), besure the alcohol is perfectlyclean, and do not allow thebearings to remain in thealcohol more than a fewhours. If it Is desirable toleave the bearings in thealcohol for a longer time, aninhibited alcohol such as isused for anti-freeze /should beused. Even then the bearingsshould be removed from thealcohol within twenty-fourhours. Esso Anti-Freeze andDu Pont Zerone are satisfac-tory for this purpose. Pre-cautions against the toxiceffects of the alcohol must beexercised by wearing rubbergloves and by using thealcohol in a well ventilatedroom; excessive exposure tothe fumes can be unpleasant

TROUBLE SHOOTING

Failure of a mechanism to operateproperly will generally fall within threegeneral classes; failure to trip, failure toclose or latch closed, and failure ofclosing springs to recharge. The followingis a brief outline showing particular typesof problems that might be encountered ,together with suggestions for remedyingthe trouble:

FAILURE TO TRIP

1. Mechansim binding or stickingcaused by lack of lubrication,

REMEDY: Lubricate completemechanism*

2. Mechanism binding or stickingcaused by being out of adjust*

ment.

ROLLING SURFACES

A number of rolling and rubbingsurfaces in the mechanism have been lub-ricated with a baked-on, dry, moly-bdenum disulfide coating. This requires

29




ing against the sides of the can be made at the installation on partstrip latch assembly support of the mechanism that are most subjectlink (55), Fig.10.

REMEDY: Check all mechanismadjustments, latches, stops,auxiliary devices, etc., in accor-dance with section on ADJUST -MENTS. Examine latch androller surfaces for corrosion.Clean as necessary.

to damage or wear. IMPORTANT: UPONCOMPLETION OF AMY REPAIRWORK, ALL MECHANISM ADJUST-MENTS MUST BE CHECKED. Refer tothe section on INSTALLATION, payingparticular attention to ADJUSTMENTSand FINAL INSPECTION.

B. Check to see if the manualclose button has clearancebetween its shaft and theclosing latch monitoringswitch operating lever (12),Fig. 10.

3. Damaged trip coil.R EMEDY: Replace damagedcoil after determining reason forthe failure.

TRIP LATCH CHECKING SWITCH

To remove*the trip latch checkingswitch (4), Fig. 7, remove the twomounting screws and disconnect the leadwires. Reassemble in the reverse order

4. Blown fuse in trip circuit.REMEDY: Replace blown fuseafter determining cause offailure.

C. If this does not cure theproblem, remove the triplatch (50), Fig. 10, and turnit over 180 degrees; thenreplace. This is an on-center explained under ADJUSTMENTS,

latch and is occasionallyground slightly off center.Make certain the breaker

and check the switch adjustments as

5. Faulty connections in trip cir-cuit.REMEDY: Repair broken orloose wires and see that allbinding screws are tight.

MOTOR LIMIT SWITCHES

The three switches (11), Fig.8A and8B are mounted in tandem.will trip at minimum volt-

age.Remove the opening spring perthe instructions below.

L6. Damaged or dirty contacts intrip circuit.REMEDY: Recondition orreplace contacts.

FAILURE OF CLOSING SPRINGS TORECHARGE 2. Remove the two mounting bolts

(28), Fig. 9, from the switchsupport (16), Fig. 4,

Driving motor inoperative due tolack of power.REMEDY: Check and replacefuses after determining cause ofblown fuses.

l .FAILURE TO CLOSE OR LATCHCLOSED 3. Remove the two mounting

screws of the lower switch.aii

Mechanism binding or stickingcaused by lack of lubrication.REMEDY: Lubricate completemechanism.

1. 4. Remove the two mountingscrews of the center switch.Driving motor inoperative due to

an opened or shorted winding.REMEDY: Replace motor afterchecking motor limit switchesfor proper setting and ratchetwheel and linkage for possibleforeign objects causing jamming.

2.

5. Remove the two mountingscrews of the upper switch.

Damaged or dirty contacts incontrol circuit.REMEDY: Recondition or re-place contacts.

2.6. Disconnect the lead wires of the

switch which is to be replaced .Driving motor continues to runbut does not completely chargesprings.REMEDY: Recheck the pawlclearance “P” and “Q” and read-just as necessary. Move themotor-mount assembly in incre-ments of 1/64 inch.

3. Reassemble in the reverse orderand check the switch adjustmentas explained under ADJUST-MENTS.

7.Blown fuse in closing circuit.REMEDY: Replace blown fuseafter determining cause of fail-

3.

ure.TRIP SHAFT AND LATCH

Faulty connection in chargingcircuit.REMEDY: Repair broken orloose wires and see that all bind-ing screws are tight.

4.Remove the trip latch checkingswitch operating lever (5), Fig.

1.7.

REPAIR AND REPLACEMENT2. Remove the cotter pins (6), Fig.

7, on both ends of the shaft.Failure to latch closed.5. The following information covers indetail the proper method of removingvarious parts of the mechanism in orderto make any necessary repairs. Thissection includes only those repairs that

A. Bend spring (57), Fig. 10, toincrease its tension andmake certain it is not bind -

3. Remove the set screw (19), Fig.7, which is in the latch shaft(18), Fig. 7.

30




When replacing the trip coil besure to assemble the correctfiber spacers at the ends beforesecuring the support bracket (9).

4.4. Remove the trip crank adjust-ment bolt (16), Fig. 7. ting level (12), Fig. 11.

3. Remove the set screws from theclosing latch (6), Fig. 8A.

4. Move the closing latch shaft (5),Fig. 8A , to the left (away fromthe frame) by tapping lightly onthe inside end of the shaft.Rotate the shaft and continuetapping until the shaft is free.The shaft will push the outsideneedle bearing from its housing.

5. Reassemble in the reverse orderputting the bearing into theframe last . Use a small piece oftubing or pipe when insertingthe bearing to assure properalignment of the bearing with itshole.

Place a block between the latchand the frame (either side) anddrive the shaft until the latch isfree of the key.

5.Adjust the trip coil location toallow 7/32 to 9/32 inch of tripcoil plunger (3), before the triplatch (7), starts to move.

Butt connect the wires andcheck the operation of the tripcoil electrically and mechani-cally.

5.

Remove the key and all burrsthat may be raised around thekeyway on the shaft. Burrs willscar the bearing surfaces if theyare not removed.

6.i 6.i1 /

.?s7. Reassemble the parts in the

reverse order. Be sure the trip CLOSING COIL (CC)latch spring (47), Fig. 11, isproperly installed and the triplatch (50), Fig. 11, is aligned inthe center of the trip latch roller(52), Fig. 11. Check the triplatch adjustment as describedunder ADJUSTMENTS.

To remove the closing coil (20), Fig.3, proceed as follows:

1. Block the closing springs (11)and (22), Fig. 3, as describedunder INSTALLATION. 6. Check the latch adjustments as

described under ADJUST-MENTS.2. Remove the left-hand closing

spring (12), Fig. 2, as describedin CLOSING SPRINGS.

TRIP LATCH ROLLER BEARING$ MOTOR SUPPORTRemove the two cotter pins at

the ends of the shaft (54), Fig.L3. Remove the two mounting bolts

which fasten the closing coil(20), Fig. 3, support bracket tothe mechanism frame (2), Fig. 9,and remove the shims above andbelow the closing coil.

1. To remove the motor support(9), Fig. 5, first remove theclosing latch spring (17), Fig. 9.

10.2. Partially remove the shaft out

the right, side of the frame (2),Fig. 9, until the trip latch roller(52), Fig. 10, is free.

i

Remove the retaining ring whichprevents the driving link (7) Fig.6, from falling off the. manualcharging stud (6), Fig. 6.

3. Remove the driving link (7), Fig,

2.

I 4. Cut the closing coil wires at thebutt connectors and remove theclosing coil.

3. Reassemble in the reverse orderwith the proper spacing ofwashers, Be sure the trip latchroller (52), Fig. 10, rotatesfreely.

1I

6.£5 , Replace the closing coil and the

correct number of fiber spacersbefore fastening the supportbracket to the mechanism frame.

'i 4. • Remove the motor leads fromthe terminal board (12), Fig. 8A.Remove the six 3/8 inch bolts(32), Fig. 11, from the bottomof the frame (2), Fig, 9.Remove the four mounting boltsfrom the motor (not shown),

Remove the retaining ring frombetween the motor (2), Fig. 5,and the motor support (9), Fig.

TRIP COIL (TC)

5.Refer to Fig. 7. To replace the poten-

tial trip coil (11), proceed as follows:

With the breaker in the openposition, remove the two mount -ing bolts which support the coilsupport bracket (9).

6. Butt connect the wires andcheck that the closing coilplunger (15), Fig. 9, is not bind-ing. Check the closing coil forelectrical operation.

1 . 6..

7.CLOSING LATCH

Remove the upper portion ofthe support bracket (9), andremove the shims (10) and (12).

2. 1. Remove the cotter pins at bothends of the closing latch shaft(5), Fig. 8A.

5.Remove the motor (2), Fig. 5.

Reassemble all parts of themotor support in the reverse ,

8 .Cut the trip coil wires at thebutt connectors and remove thetrip coil (11).

3. 2. Remove the closing latch spring(17), Fig. 9, and the closinglatch monitoring switch opera-

\\9.

!

' • 31 '

i » »




LATCHING PAWLS ©

r-CTvr-<N

tu

CLOSING SPUING

CLOSING SPRING

IFig. 21. Schematic of ML-14 Mechanism

order and re-align it properly as . 3. Remove the prop reset test 5. Remove the shaft out the leftside of the mechanism frame (2),Fig. 9.

described under DRIVING spring (10), Fig. 4.PAWL ADJUSTMENTS.

4. Remove the two set screws fromthe cam (39), Fig. 10, and movethe cam to the light on the shaft(3), Fig. 4, as far as it will go.Slide the cam shaft to the leftuntil the key is fully exposed.Remove the key and check theshaft for burrs. Remove anyburrs before removing the shaftfrom the frame.

6. Reassemble in the reverse orderusing the correct number ofwashers and spacers to properlylocate the parts.

7. Rotate the mechanism througha closing operation using themanual charging wrench (7), Fig.5. Check the location of the cam

1, Remove the two set screws fromthe ratchet wheel (17), Fig. 3,and remove the wheel from themain shaft (18), Fig. 3.

2. Remove the two set screws fromthe cam (2), Fig. 4.




; ©OPENING SPRING00

OS

; Osoo<Ni CIRCUIT BREAKER

CONTACTS SNCLOSED POSITION

(N.i-i

TRIP LATCHCHECKINGSWITCHl

PULL TO!CLOSE

TRIP FREELINKAGE

If

i

1

I ©I

Fig. 22. Schematic of ML-14 Mechanism and Circuit Breaker in Closed Position2. Discharge the springs by pushing

the manual close button (24),Fig. 2.

3. Rotate the cam shaft (7), Fig.12, by using the manual chargingwrench (7), Fig. 5, until the gapbetween the springs (12) and(28), Fig. 2, and the guide block

. (19), Fig.. 3 and (8), Fig. 2, is - .two inches or more.

a

follower roller (37), Fig. 30, onthe cam (39), Fig. 10. If neces-sary, adjust the cam on the camshaft to correct the alignment.Complete the closing operationand check the location of thecam follower roller shaft (68),Fig. 10, on the prop (38). Itshould be approximately cen-tered.

retaining cotter pin and washerfrom the limit switch cam (1),Fig. 8A, shaft. Remove the innerrace of the bearing in the guideblocks (3). This permits theguide block (3) to slide off theshaft of the limit switch cam (1)for easy removal of the leftspring (12), Fig. 2.

**.

5. Either open the operating mech-anism by pushing the manualtrip lever or block the breaker inthe closed position with a suit-able blocking device.

aI

CLOSING SPRINGSThe closing springs (12) and (28),

Fig. 2, can be removed as follows:1. Charge the springs with the

manual charging wrench andapply the spring blocking device(13) and (30), Fig. 2, as de-scribed in INSTALLATION.

• ?

14. Lift both springs until they clear

the lower supports, then pullforward and down until the topsupports are free. Removing theleft spring (12), Fig. 2, is diffi-cult with the control panel (20),Fig. 4, assembled in the controlhouse (1), Fig. 3. Remove the

A

6. After reassembling the springscheck the breaker stroke asdescribed in the breaker instruc-tion book.

RIPLAC1MBNT PAHTSIt is recommended that sufficient such parts minimizes service interruptions

renewal parts be carried in stock to caused by breakdowns and saves time andenable prompt replacement ofbroken, or damaged parts. A stock of

parts should be carried, the amountdepending upon the severity of the ser-vice and the time required to

moie renewal replacements.$ w°rn, expense. When continuous operation is a

primary consideration, secure

33



GEK 7153 Spiing-charged Operating Mechanism Type ML-140

General Electric Company, giving thecomplete data shown on the breakernameplate, such as serial number, type,and rating of the breaker. The breakernameplate is mounted on the inside ofthe front door of the operating mech-anism compartment. Also, furnish acomplete description of each part as out-lined above, the quantity required and, ifpossible, the number of the requisition onwhich the breaker was originally fur-nished.

on the purchase order.On the following pages a list of re-placement parts will be found. This listincludes both recommended renewalparts as designated by the asterisk (*) aswell as a listing of parts ordered mostfrequently. The actual drawing number aswell as the figure and part numbers in thisbook are given. Where parts are requiredthat do not appear on this list, and henceno drawing number is available the in-struction book number as well as thefigure and part number should be given address the nearest Sales Office of the

©Replacement parts may not always

be identical to the original parts sinceimprovements are made from time totime. The parts which are furnished, how-ever, will be interchangeable. All “0”rings have a limited shelf life of threeyears.

When ordering replacement parts,

REF. QTY. PERMECI1.

FIG. DESCRIPTION OF PARTCATALOG NO.NO.NO.Auxiliary Switch - SB-1 (11 Stage, 11 Circuit ) (Special)Auxiliary Switch - SB12 (5 Stage, 10 Circuit ) (Standard)Spring Charging Motor (48v d-c)Spring Charging Motor (125v d-c and 115v a-c)Spring Charging Motor (250v d-c)Spring Charging Motor (2.30v a-c)Operation CounterWindowWindow GasketOperation Counter Return SpringLock-out Switch (69 Device)Ratchet WheelGuide Block Bearing-Outer RaceGuide Block Bearing-Inner Race

Control House Heater (115v a-c)Control House Heater (230v a-c)Prop Reset SpringMotor Limit Switches (normally open)Rear Motor Limit Switch (normally closed)Cutoff and Anti-pump Relay-52Y-(48v d-c) (12HGA35A3)Cutoff and Anti-pump Relay-52Y-(125v d-c) (12HGA35A2)Cutoff and Anti-pump Relay-52Y-(250v d-c) (12HGA35A1)Cutoff and Anti-pump Relay-52Y-(230v a-c) (12HGA35A5)Cutoff and Anti-pump Relay Coil-(48v d-c)Cutoff and Anti-pump Relay Coil-(125v d-c)Cutoff and Anti-pump Relay Coil- (250v d-c)Cutoff and Anti-pumpRelay Coiil-(230v a-c)Charge-discharge Indicator Spring

Motor Support Housing - Outer RaceMotor Support Housing - Inner Race

Closing Coil - 52CC - (48v d-c)Closing Coil - 52CC - (125v d-c)Closing Coil - 52CC - (250v d-c)Closing Coil - 52CC - (230v a-c)Closing Latch Monitoring Switch (Normally Open)Closing Latch SpringTrip Latch Checking Switch (Normally Open)(.'lose Latch Roller

0128B1722G0010226A9901GOO10193A4998P0010193A4998P0020193A4998P0030193A4998P0040103A3075F0010178V0727P0010183V0711P0010455A0300P0010307V0199P0010104C8078G001

0414A0112P056Q414A0112P057

1323 12

1*112*11 12

1*112*11 1214 12

16 & 33 2222

02 117 12

i17 1323

03 2

*7 0103A2049P0020103A2049P0010193A4943P001

0456A0866P0050456A0866P0060103A1438P0600103A1438P0590103A1438P0580103A1438P106006306774G008006306774G004006306774G002006306774G0020193A4945P001

4 1*7 14104 1

*174 2*17 14224 1224 1

4 22 14 22 1

*04 1*04 1*04 1 f%*04 10 14

0414A0112P0590414A0112P060

5 2905 2

*13 006174582G039006174582G022006174582G002006174582G010

0456A0866P0050193A4946P001

0456A0866P00504.14A0112P058

9 1*139 1*139 1*139 1*169 1

179 1(r *229 1

299 1

0 Not Shown*Recommended Renewal Parts!

34



Spring-charged Operating Mechanism.Type ML-14-0 GEK 7153

s ©QTY. PERMECH.

FIG. REF DESCRIPTION OF PARTCATALOG NO.NO. NO.

H

\ Trip Coil - 52TC - (24v d-c)Trip Coil - 52TC - (48v d-c)Trip Coil - 52TC - (125v d-c)Trip Coil - 52TC - (250v d-c)Trip Coil - 52TC - (230v a-c)Driving Chain and Connecting Link Complete

10 006174582G027006174582G032006174582G022006174S82G002006174582G0010132A1416P001

*42 1Ai1 . 10 *42 1A

10 *42 1A3101 *42 1A

: 10 *42 1A10 194:i

1 Inner Latching Pawl with Bushing - CompleteOuter Latching Pawl with Bushing - CompleteDriving Pawl and Bushing - CompleteDriving Pawl SpringInner Latching Pawl SpringOuter Latching Pawl Spring

Output Crank Bushing (Textolite)Output Crank Main Shaft Bushing (Textolite)Upper link Bushing (Textolite)Lower Link Bushing (Bronze)Trip Latch Roller Bushing (Bronze)Trip Latch Shaft Bearing (Ball Bearing)Guide Block Bearing (Outer Race) (Roller Bearing)Guide Block Bearing (Inner Race) (Roller Bearing)Cam Shaft Bearing (Outer Race) (Roller Bearing)Cam Shaft Bearing (Inner Race) (Roller Bearing)Closing Prop Bushing (Textolite)Link Shaft Bushing (Textolite)Closing Latch Shaft Bearing (Needle Bearing)Driving Crank Bushing (Bronze)Driving Pawl Bushing (Bronze)Driving Link Bushing (Bronze)Driving Eccentric Shaft Bearing (Outer Race) (Roller Bearing)Driving Eccentric Shaft Bearing (Inner Race) (Roller Bearing)Latching and Safety Pawl Bushing (Bronze)Driving Eccentric Bushing (Bronze)Trip Latch Roller Bearing - (Inner Race)Trip Latch Roller Bearing-(Outer Race)Cam Follower Roller Bearing-(Inner Race)Cam Follower Roller Bearing-(Outer Race)

0202A6386G0020202A6386G0010202A6386G003

0161A4241P0010193A4941P0010193A4941P001

12 1*7012 1*70

112 *74r.! 12 187

012 1<' 12 0 1

20 006370567P059006370568P051006370567P0590202A4508P0010202A4508P001

0414A0112P0370414A0112P0560414A0112P0570414A0112P050

2* 1- 20 2* 2t7 20 * 3 2t 20 * 4 2

20 * 5 2$20 * 6 2

i * 720 2mri 20 * 8 24i 20 * 9 20414A0112P0510202A4508P002006370567P042

0414A0112P0610193A4948P0010202A5595P0020202A5595P003

0414A0112P0970414A0112P1000202A5595P0010202A4508P001

0414A0112P0530414A0112P0520414A0112P053°414A0112P052

*1020 2S:20 *11 2

*1220 2I *1320 2i *1420 11 1520 1

*1620 1*!720 2

'i *1820 21920 2

*2020 1*2120 1

1 *2220 1*2320 1*2420 I

i

*Recommended Renewal PartsA Independent Dual Trip Coil Option — Any Voltage Combination of Two Coils

0 Not ShownI

m

35



VT5V*.*.

O

4

GENERAL ELECTRIC COMPANYSWITCHGEAR BUSINESS DEPARTMENT

PHILADELPHIA, PA 19142

G E N E R A L E L E C T R I C

©



spring-charged operatingmechanism

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