63-2582 - r7195a,b motor positioner · r7195a,b motor positioner application the r7195a,b motor...

PRODUCT DATA

63-2582® U.S. Registered TrademarkCopyright © 2002 Honeywell � All Rights Reserved

R7195A,BMotor Positioner

APPLICATIONThe R7195A,B Motor Positioner is a single channel solid state proportioning amplifier that will accept an output signal from a controller to position a reversing control motor with a 135-ohm or 1000-ohm feedback slidewire. Motors with slidewires that have resistances other than 135 ohms or 1000 ohms will be shunted to one of these two values.

The R7195A Motor Positioner is factory-adjusted to accept a 4 to 20 mA input. The R7195B Motor Positioner is factory-adjusted to accept input from a 135-ohm retransmitting slidewire.

FEATURES� Accepts 4-20 mA or 135-ohm signal to provide position

proportional control of M944 Modutrol® Motor without balance relay and M940A,B Actionator.

� Heavy duty case.� Mounts directly on M940 Actuator.� Solid state design extends product life and reliability.� Zero, span and deadband adjustments allow motor to

be field adjusted to various input ranges: i.e., split ranging.

� Hard Manual feature allows operator to override the controller (4-20 mA or 135-ohm input) action to open or close fully the final control element.

� Reversing direction of motor can be accomplished by simple wiring change of R7195.

� Output from one R7355 4-20 mA DialaTrol can operate up to eight R7195 Positioners and associated M944 or M940 Actuators.

� Output from one 135-ohm Series 90 Controller can operate up to five R7195B Motor Positioners.

� Span and zero adjustment do not interact with each other so each adjustment can be made independently without having to readjust the other parameter.

� Can operate with motor feedback slidewire between 100 and 1000 ohms.

ContentsApplication ........................................................................ 1Features ........................................................................... 1Specifications ................................................................... 2Installation ........................................................................ 3Wiring ............................................................................... 3Operation .......................................................................... 6Service and Troubleshooting ............................................ 7

R7195A,B MOTOR POSITIONER

63-2582 2

ORDERING INFORMATIONWhen purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Home and Building Control Sales Office (check white pages of your phone directory).2. Home and Building Control Customer Relations

Honeywell, 1885 Douglas Drive NorthMinneapolis, Minnesota 55422-4386

In Canada�Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

SPECIFICATIONSModels:See Table 1.

Table 1. R7195A,B Models.

Operating Temperature Range:-30°F to +150°F (-35°C to +66°C).

Slidewire Resistance:135 ohms or 1000 ohms.

Input Range�R7195A (4-20 mA):Adjustments:

Zero: 0.8 to 16.8 mA.Span: 2.0 to 20.0 mA.Deadband: 1% to 5%.

Factory Settings:Zero: 4.0 mA input = 0% to 5% feedback potentiometer

position.Full Scale: 20 mA = 95% to 100% feedback potentiometer

position.

Input Range�R7195B (135-ohm retransmitting slidewire input):Adjustments:

Zero: 0% to 80% of slidewire input.Span: 12.5% to 125% of slidewire input.Deadband: 1% to 5% of slidewire input.

Factory Settings:Zero: 0% to 2% input potentiometer = 0% to 10% feedback

potentiometer position.Full Scale: 98% input potentiometer = 90% to 100%

feedback potentiometer position.

Repositions:1% Deadband Setting = 100 repositions.5% Deadband Setting = 20 repositions.

Input Impedance:R7195A: 75 ohms.R7195B: 1 Megohm.

Dimensions:See Fig. 1.

Weight:R7195A: 2.7 lbs (1.2 kg).R7195B: 3 lbs (1.4 kg).

Approvals:Underwriters Laboratories, Inc. Listed: Type 4 Enclosure, File

Number 84572.CSA Certified: Enclosure 4, File Number LR47125.

Model Number Operating Voltage Controller InputR7195A1031 120 Vac, 60 Hz 4-20 mAR7195A1056 120 Vac, 60 Hz 4-20 mA (equipped for

1000-ohm feedback slidewire)

R7195A1064 220 Vac, 60 Hz 4-20 mAR7195B1021 120 Vac, 60 Hz 135-ohm input


3 63-2582

Fig. 1. R7195A,B Motor Positioner approximate dimensions in in. (mm).

INSTALLATION

When Installing this Product�1. Read these instructions carefully. Failure to follow them

could damage the product or cause a hazardous condition.

2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.

3. The installer must be a trained, experienced technician.4. After installation is complete, check out product

operation as provided in these instructions.

WARNINGElectrical Shock Hazard.Can cause serious injury or death.Disconnect power supply before beginning installation. More than one disconnect may be needed.

Equipment RequiredTo install the R7195A,B Motor Positioner, you will need:

1. Electric drill.2. Drill bits (No. 23, No. 37).3. Four No. 6 machine screws or four No. 6 self-tapping

screws.4. Standard screwdriver.5. Small adjustable wrench.6. Center punch and hammer.

ProcedureRefer to Fig. 1 and layout of the centers of the mounting hole locations on the mounting surface.

1. Use a center punch and hammer to mark the locations for drilling.

2. Depending on the characteristics of the mounting surface, drill clearance holes (No. 23 bit) for No. 6 machine screws or starting holes (No. 37 bit) for No. 6 self-tapping screws.

3. Place the positioner on the surface so that the mounting holes are aligned with those drilled in the surface and secure with the machine screws and nuts or self-tapping screws, as applicable.

4. Install separate conduit for controller leads and operating voltage leads.

WIRING

GeneralAll wiring must comply with all applicable local electrical codes, regulations and ordinances. When wiring more than one motor positioner to a controller, make sure that the total impedance of positioners and wiring is less than the output impedance of the controller.For example, the R7355 DialTrol� Controller can be wired to a maximum of eight R7195A Motor Positioners. The R7355 Controller is capable of driving a load of up to 650 ohms. See Fig. 2.

3-3/4 (95)

6-9/16(167)

3/4 (14) NPSM (2)

7-3/8(187)

3-1/2 (89)3/16 (5)

M20786

4-29/32 (124)

7-25/32(198)


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Fig. 2. Multiple R7195A Motor Positioners connected to one 4-20 mA input.

Split Range CapabilitySee Fig. 2 and 3. Two R7195A Motor positioners can be wired to operate in series or can be used to split the range. One R7195A Motor Positioner can be calibrated from 4 mA to 12 mA and the second positioner can be calibrated from 12 mA to 20 mA. Both positioners can also operate in series with an operating range of 4-20 mA.

More than one R7195B Motor Positioner can be connected to a single 135-ohm input potentiometer as shown in Fig. 3. All W and R motor positioner terminals are connected in parallel to the potentiometer. Only one motor positioner terminal B is connected to the input potentiometer. The R7195B Motor Positioners may be calibrated to operate as split ranges or all may be set to the same range. Up to five R7195B Positioners may be connected to the one potentiometer.

Fig. 3. Multiple R7195B Motor Positioners connected to one 135-ohm input potentiometer.

Wiring Motor Positioner to Motor Terminals1. Refer to wiring diagrams and documentation supplied

with the motor to connect the motor positioner for specific applications.

2. To avoid inductive interference to the internal circuitry, separate the leads carrying line voltage from all other leads.

3. Provide conduit protection for controller leads and provide separate conduit for motor positioner leads from terminals 4, 5 and 6.

4. Refer to Fig. 4, 5, 6 and 7 for examples of typical wiring configurations.

Fig. 4. Connections to M940 Motor using separate supply voltage.

4 TO 20 mACONTROLLER

R7195

R7195

4-20 mAOUTPUT

+

-

W

R

W

R

M20787A

R7195MOTOR

POSITIONER

B R W B R W B R W

RE-TRANSMITTING POTENTIOMETER (OR OTHER POTENTIOMETER) USED FOR INPUT. M20787

1

1

R7195MOTOR

POSITIONER

R7195MOTOR

POSITIONER

5 4 6

G L2 L1 2 3 1 B W R

G 3 2 1

6 5 4

GROUND

GROUND

NEUTRAL

HOT

HOT

NEUTRALMOTORSUPPLY

R7195SUPPLY

M940A MOTOR

TERMINALS TO4-20 mA INPUT

B W R

CW

135-OHM POTENTIOMETERINPUT

M20789A

+ -

R7195A,BMOTOR POSITIONER


5 63-2582

Fig. 5. Connections to M940 Motor using common supply voltage.

Fig. 6. Connections to M944G,S Motors.


5 4 6

G L2 L1 2 3 1 B W R

G 3 2 1

6 5 4

GROUND

NEUTRAL

HOT

R7195SUPPLY

M940A MOTOR

TERMINALS TO4-20 mA INPUT

B W R

CW


M20790

+ �


5 4 6

G L2 L1 2 3 1 B W R

1L1

L2

2 3 R

Y T G

GROUND

NEUTRAL

NEUTRAL

HOT

HOT

R7195SUPPLY

M944 G, SLINE

VOLTAGEMOTOR TERMINALS TO

4-20 mA INPUT

B W R

CW


M20791

+ �


63-2582 6

Fig. 7. Connections to M944B,E Modutrol® Motors.

OPERATION

Operating PrinciplesSee Fig. 8 and 9.

When the motor positioner is connected to a reversing control motor, proportioning controller, and power supply (as specified in the application), the unit will operate as follows:

The controller output signal is transmitted to the balancing bridge portion of the motor positioner. The balancing bridge will compare the controller output to the feedback potentiometer voltage. This compared voltage is referred to as the error signal voltage. The balancing bridge circuit will amplify the error signal, causing a Triac switch to fire. This will energize a motor winding and will re-position the feedback potentiometer until the error signal is reduced to zero.

Fig. 8. Block diagram.


5 4 6

G L2 L1 2 3 1 B W R

1 2 3

L1

L2

24 VAC

120 VAC

Y T G

GROUND

NEUTRAL

HOT

R7195SUPPLY

M944B, EMODUTROL

MOTORSTERMINALS TO4-20 mA INPUT

B W R

CW


M20792

+ �

SENSOR FEEDBACKPOTENTIOMETER

MOTORWINDINGS

INPUT FROMCONTROLLER

BALANCING BRIDGE CIRCUIT

(COMPARES INPUT TO FEEDBACK POTENTIOMETER)

TRIAC SWITCHES

POWER SUPPLY

ZERO CROSSING CIRCUITS (220/240 VAC)

OPTO ISOLATORS (120 VAC)

(PROVIDE RFI PROTECTION; ALSO DRIVES TRIACS)

M20793


7 63-2582

Fig. 9. External wiring diagram.

Heating Application # 1:When the temperature at the sensor is above the range of the controller, the controller output will be above the proportioning range of the controller. For example: the controller output signal will be less than 4 mA for a 4-20 mA range controller; motor positioner triac Q3 will fire to drive the motor to the closed position.

Heating Application # 2:When the temperature at the sensor is below the range of the controller, the controller output will be below the proportioning range of the controller. For example: the controller output will be greater than 20 mA for a 4-20 mA range controller. Motor positioner triac Q4 will fire to drive the motor to the open position.

Heating Application # 3:When the temperature at the sensor is within the proportioning range of the controller; Q3 triac will fire as the sensor temperature rises above the controller setpoint to drive

the motor in the closed direction. Q4 triac will fire as the temperature at the sensor drops below the controller setpointt to drive the motor in the open direction.

In each case the motor will move until a new balance point is reached such that the error voltage between the input signal and the slidewire signal is zero.

SERVICE AND TROUBLESHOOTING

Calibration ProcedureNOTE: The R7195 Motor Positioner is calibrated at the

factory for a 4-20 mA input signal for the R7195A and a 135-ohm potentiometer input for the R7195B. Therefore, do not calibrate the motor positioner unless the input signal desired is something other than 4-20 mA (R7195A) or 135 ohms (R7195B).

To calibrate the positioner, refer to Fig. 9.

For the span and zero adjustment check, do the following:

1. Connect the input source (4-20 mA or 135-ohm potentiometer) to terminals R, B and W.

2. Set the input to the minimum value of span. Adjust the zero potentiometer (P3) to balance out the motor and the minimum limit.

3. Set the input to the maximum value of span. Adjust the span potentiometer (P1) to balance out the motor at the maximum limit.

Deadband AdjustmentThe deadband adjustment (P2) will be set at the mid position to provide precise control of the process for most process applications. Some processes may require deadband adjustment to achieve stable control. Unstable process conditions may be characterized by:

(P1) SPAN ADJUST

(P2) DEADBAND ADJUST

(P3) ZERO ADJUST

M202794

GROUND

NEUTRAL

HOT

GROUND

R7195 SUPPLY

HOT

ROTOR SWITCH

CCWCLOSE

CWOPEN

MOTORWINDINGS

Q4

Q3 LIMITSWITCHES

NEUTRAL

G

GROUND

MOTORSUPPLY

COMMON

4-20 mA INPUT

MOTOR

B W R

CW

135-OHMPOTENTIOMETER INPUT


5 4 6

G L2 L1 2 3 1 B W R


63-2582 8

a. Frequent re-positioning (hunting) of the motor.b. Oscillation of the process variable around the

setpoint.Check for unstable process conditions during initial startup of the process. If unstable operation occurs, increase the deadband adjustment (P2) until the cycling rate diminishes.

Hard Manual CheckHard Manual allows the operator to override the controller action to open or close fully the final control element (valve, damper, etc.).

4-20 mA�Model 7195AConnect terminal W to terminal B to drive the motor fully open. Disconnect terminal W or terminal R to drive the motor fully closed.

135-ohm Potentiometer�Model R7195BConnect terminal W to terminal R to drive the motor fully closed. Disconnect wire from Terminal W to drive the motor fully open.

Troubleshooting

CAUTIONEquipment Damage Hazard.Improper procedure can damage internal circuits.To prevent triac damage, do not attempt to short R7195 terminals 1, 2 or 3.

Motor Checkout Procedure1. Identify wires on terminals 1 through 6 by terminal

number; then disconnect them from the terminals.2. Connect an ohmmeter across wires 4 and 5 (feedback

slidewire).3. Apply rated voltage across wires 1 and 2. Observe

gradual increase or decrease in feedback resistance.4. Apply rated voltage across wires 2 and 3. Observe

gradual increase or decrease in feedback resistance.If the motor functions properly, continue with the troubleshooting procedure that follows.

4-20 mA Input ApplicationsPRINTED WIRING BOARDRefer to Fig. 10 and 11.

1. Connect the operating voltage leads to the appropriate terminals and apply power (Fig. 10).

2. Set the motor at mid-range as follows:a. Connect input source to terminals W and R, as

applicable to the motor.b. Adjust the input source to mid-range.

3. Refer to Fig. 11, a logic diagram to help you isolate output circuit component failures on the printed wiring board. Please refer to the appropriate literature for your motor.

4. The types of component failures are listed below:

a. Shorted triac switches Q3 and Q4.b. Q3 and Q4 break over at less than rated voltage.c. Q3 and Q4 do not fire.d. MOV (CR12) shorts.

5. If the logic diagram does not identify your system-related problem, the failure is not in the output circuit and the controller should be replaced or you may use the schematic to troubleshoot the board.

NOTE: If your motor-motor controller system runs to fully open or fully closed position, but fails to balance with proper input conditions, it may be necessary to reverse either motor power connections (1 and 3) or feedback slidewire connections (4 and 6) at the controller.

REVERSING DIRECTION OF THE MOTORMotor direction may be reversed as follows:

1. Interchange motor winding connections on terminals 1 and 3.

2. Interchange feedback potentiometer connections on ter-minals 4 and 6.

135-Ohm Input ApplicationsPRINTED WIRING BOARDRefer to Fig. 10 and 11.

1. Connect the operating voltage to the appropriate terminals and apply power.

2. Set the motor at mid-range as follows:a. Connect input source to terminals B, W and R.b. Adjust input source to mid-range.

3. Refer to Fig. 11, a logic diagram to help you isolate output circuit component failures on the printed wiring board. Please refer to the appropriate literature for your motor.

4. Types of component failures are listed below:a. Shorted Triac switches Q3 and Q4.b. Q3 and Q4 break over at less than rated voltage.c. Q3 and Q4 do not fire.d. MOV (CR12) shorts.

5. If the logic diagram does not identify your system-related problem, the failure is not in the output circuit and the controller should be replaced or you may use the schematic to troubleshoot the board.

NOTE: If your motor-motor controller system runs to fully open or fully closed position, but fails to balance with proper input conditions, it may be necessary to reverse either motor power connections (1 and 3) or feedback slidewire connections (4 and 6) at the controller.

REVERSING DIRECTION OF THE MOTORMotor direction may be reversed as follows:

1. Interchange motor winding connections on terminals 1 and 3.

2. Interchange feedback potentiometer connections on terminals 4 and 6.


9 63-2582

Fig. 10. Flowchart to troubleshoot output Triac switch circuits for 4-20 mA input.

REPLACE Q3.NO

DID MOTORDRIVE OPEN?

IS OPERATING VOLTAGE

120V?

TRIAC OUTPUT CIRCUIT IS OKAY.REPLACE OR TROUBLESHOOTPRINTED WIRING BOARD USINGSCHEMATICS.

MEASURE AC VOLTAGE AT TERMINALS L2 TO 1.

REPLACE Q4.

REPLACE Q4.

DID MOTORDRIVE ATNORMALSPEED?

YES

NO

IS VOLTAGELESS THAN

10V?

YES

NO

REPLACE Q3, A4, R28, R29.

YES

YES

NO

NO

YES


REPLACE Q4


REPLACE CR12

REPLACE Q3.

M20795

NO

YES

SHORT TERMINALSB TO W.

CONNECT OPERATING VOLTAGE. OPEN INPUT FROM CONTROLLER.

MEASURE AC VOLTAGE ATTERMINALS 1 AND L2.

IS VOLTAGELESS THAN

10V?

REPLACE Q3.

YES

NO

YES

NOYES

DID MOTORDRIVE

CLOSE?



IS OPERATINGVOLTAGE

120V?

NO


63-2582 10

Fig. 11. Flowchart to troubleshoot output Triac switch circuits for 135-ohm potentiometer input.

REPLACE Q3.NO


IS OPERATING VOLTAGE

120V?

TRIAC OUTPUT CIRCUIT IS OKAY.REPLACE OR TROUBLESHOOTPRINTED WIRING BOARD USINGSCHEMATICS.

MEASURE AC VOLTAGE AT TERMINALS L2 TO 1.

REPLACE Q4.

REPLACE Q4.


YES

NO

IS VOLTAGELESS THAN

10V?

YES

NO


YES

YES

NO

NO

YES


REPLACE Q4


REPLACE CR12

REPLACE Q3.

M20796

NO

YES

OPEN INPUT W.

CONNECT OPERATING VOLTAGE. SHORT R-W.

MEASURE AC VOLTAGE ATTERMINALS 1 AND L2.

IS VOLTAGELESS THAN

10V?

REPLACE Q3.

YES

NO

YES

NOYES

DID MOTORDRIVE

CLOSE?



IS OPERATINGVOLTAGE

120V?

NO

11 63-2582

63-2582 G.R. 09-02 Printed in Mexico www.honeywell.com

Automation and Control SolutionsHoneywell Honeywell Limited-Honeywell Limitée1985 Douglas Drive North 35 Dynamic DriveGolden Valley, MN 55422 Scarborough, Ontario

M1V 4Z9


By using this Honeywell literature, you agree that Honeywell will have no liability for any damages arising out of your use or modification to, the literature. You will defend and indemnify Honeywell, its affiliates and subsidiaries, from and against any liability, cost, or damages, including attorneys’ fees, arising out of, or resulting from, any modification to the literature by you.

63-2582 - r7195a,b motor positioner · r7195a,b motor positioner application the r7195a,b motor...

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