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INSTRUCTION PAMPBI.ET NUMBER U-5725

UNION SWITCH & SIGNAL ....• SWISSVALE, PA. DIVISION OF WESTINGHOUSE AIR BRAKE: COMPANY

INSTALLATION AND MAINTENANCE INSTRUCTIONS

FOR THE

529 INDICATION SYSTEM

*************************

TABLE OF CONTENTS Page

I. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

II. PRINCIPLE OF OPERATION .................. ,. . . . . . 5

III. EQUIPMENT DESCRIPTION . . . . . . • . . . . . . . . . . . . . . . . . . 9

A. Line Pulsing Panel . . . . . . . • . . . . . . . . . . . . . . . . . . 9

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Circuit Description . . . . . . . . . . . . . . . . . . . . . • . 10

B. Tone Transmitting Unit. • . . .. . .. . . . . . . . . . . . . . . . . 10

Features .................... '. . . . . . . . . . 10 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . 14

c. Tone Receiving Unit . . . . . . . • . . . . . . . . . . . . . . • . . 14

Features . . . . . . . . . . . • . • . . . . . . . . . . . . . . . . 14 Circuit Description . . . . . . . . . . • . . . . . . • . . . . . 14

D. Chain Relay Panel . . . . . . • . . . . . . . . . . . . . . . . . . . 17

Features . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . 17 Circuit Description . . . . . . . . . . . . . . . . . . . . . . • 18

E. Field Switching Unit . . . . . . . . . . . . . . • . . . . . . . . . • 21

Features . . . . . . . . . . . . . • . • . . . . . . . . . . . . . . 21 Circuit Description . . . . . . . • . . . . . . . . . . . . . . . 22

F . Indication Panel . . . . . . . . . . . . . . . . . . • . . . . . . . . . 24

Features . . . . . . . . • . . • . . . . . . . . . . . . . . . . . . 24 Circuit Description . . . . . . • . . . . . . • . . . . . . . . . 27

_______ ex:., December 1960 A0.60-750-12.60.1 Printed in U. S. A. llJ

U.S. & S. - 2 - U-5725

IV. INSTALLATION DATA .•...••.•..•.........•...•.. 28

A. General Information. . . . • . • . • • . . . . • . . • . . . . . . • 28

Mechanical Inspection . . . . . . . . . . • • . . • . • . . . • 28 Fail-Safe Application . . . . • • . . • • • . . . . . . . . . . . 28 Power Requirements . . . . . • . . . . • . . . • . • . • . . . 28 Line Circuits . . . • . . . . . . . . . . • • . . . . . . . . . . • 2 8 Lightning Protection. . . . . • . . . . • . . . . . . . . . . . . 28 Connections and Adjustments . . . . . • • . . . . . • . . . 28

V. FIELD MAINTENANCE ........................... . 31

A. Field Units . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . 31

B. Office Units . • . . . . . . . . . . . . . . . . . . . . . . . . . . . • 31 ... . VI. SHOP MAINTENANCE AND TEST FACILITIES . . . • . . • . . . . . 33

: .. '

Power Requirements . . . . . . . . . . . . . . . . . . . . . . 33

Test Equipment and Tools . . . . . . . . . . . . . • . . . . 33

A. Tone Transmitting Unit Check and Repair . . . . . . . . . . 34

B. Tone Receiving Unit Check and Repair. . . • • • . • . . • . . 35

C. Field Switching Unit Check and Repair. . . . • . . . . . . . . 37

D. Chain Relay Panel Check and Repair . • . . • . . . . • . . . . 41

E. Indication Panel Check and Repair. . . . . . . • . . . . . • . . 42

F. Line Pulsing Panel Check and Repair. • • . . . . . . • . . . . 43

,.

U.S. &S.

Figure No.

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

- 3 - U-5725

LIST OF ILLUSTRATIONS

Title Page

Block Diagram of the 529 Indication System. . . . . . • . • 5

Field Unit . . . . . . . . . . . . . . . . . . • . . . . . • . . . . . . 6

Field Unit Schematic Diagram . . . . . . . . . . . • . . • . . 7 & 8

Line Pulsing Panel . . . . . . . . . . . • . . . . . . . . . . . . . 9

Line Pulsing Panel Schematic Diagram . . . . . . . . . . . . 11 & 12

Line Pulsing Panel Wave Shape . . • . . . . . . . . . . . . . . 13

Tone Transmitting Unit .......•..•...........

(a) with cover. (b) with cover removed showing printed circuit

boards and components.

13

Tone Transmitting Unit Schematic Diagram. . . . . . . . . 15

Tone Receiving Unit . . . . . . . . . . . . . . . . . . . . . . • . 16

Tone Receiving Unit Schematic Diagram. . . . . . . . . . . 16

Chain Relay Panel. . . . . . . . . . . . . . . . . . . . . . . . . . 17

Chain Relay Panel Schematic Diagram . . . • . . . . . . . . 19 & 20

Field Switching Unit . . . . . . . . . . . . . . . . . . . . . • . . 21

(a) with cover. (b) with cover removed showing printed circuit

boards and components.

Field Switching Unit Schematic Diagram. . . . . . . . . . . 23

Indication Panel . . . . . . . . . . • . . . . . . . . . . . . . . . . 24

Indication Panel Schematic Diagram. . . . . . . . . . . . . . 25 & 26

Tone Transmitting Unit Test Circuit • • . . . • . . • . . . . 34

Tone Receiving Unit Test Circuit .............. . 36

Nomograph for computing DBM from voltage measurements . . . . . . . . . . . . . . . . . . . . • . . . . 38

U.S. & S. - 4 - U-5725

I. INTRODUCTION

The 529 Indication System provides a method for indicating, at one or more office or registry locations, the positions or conditions of a multiplicity of functions distributed over a number of wayside locations.

The 529 System employs a two-wire polarized D. C. line circuit extending from an office or central location to the distant ends of the indicated territory and tone equipment consisting of transmitters at the various wayside locations and receivers~ ~t each office or registry location.

The System uses a continuous checking scheme wherein the positions or conditions of all functions are reported on successive checking cycles. Each cycle is approximately three seconds in length and consists of a first period during which the line circuit is energized with a given polarity, a second period during which the line circuit is de -energized, a third period during which the line circuit is energized with the opposite polarity, and a fourth period during which the line circuit is again de-energized. On each of the four approximately equal periods of a checking cycle, the position or condition of one two-position wayside function is indicated by the presence or absence of a given tone. Thus the positions or conditions of four two -position functions are indicated per tone on each complete checking cycle.

Theoretically, the capacity of the system is limited only by the number of separate and distinct tones obtainable. Practically, however, due to the electrical characteristics of the line circuit and contact capacity of the chain switching relays at the registry locations, the capacity of the system is limited to 64 functions, 4 functions per each of 16 separate and distinct tones in the voice frequency range.

.,.- -......,_

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U.S. &S • - 5 - U-5725

II. PRINCIPLE OF OPERATION

Figure l is a block diagram illustrating the principle of operation of the 529 Indication System.

The Line Pulsing Panel, which generates and applies to the line circuit con -tinuous four period checking cycles may be located at any convenient location, usually at an office or registry location.

One or more office or registry locations may be provided at convenient points. Each location requires: (1) a Chain Relay Panel; and (2) a number of Indication Panels (maximum of eight panels) depending on the total number of functions to be indicated.

LINE CIRCUIT

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I LINE I CHAIN RELAY PANEL INDICATION PANEL FIELD UNIT FIELD UNIT PULSING

CHAIN RELAY TONE FINAL SWITCHING I TONE SWITCHING TONE PANEL

RELAYS SWITCHING RECEIVING STICK UNIT TRA~SMITTER UNIT TRANSMITTER UNIT UNITS RELAYS - -

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FUNCTION I RELAY

FUNCTION I RELAY

INDICATION ~ PANEL FIELD LOCATIONS

OFFICE OR REGISTRY LOCATIONS

Figure l ... Block Diagram of the 529 Indication System

The field or wayside equipment, shown in Figures 2 and 3, includes a Tone Transmitting Unit and a Field Switching Unit for each group of four or less, two -position functions.

The Chain Relay Panel contains a transistorized switching unit which responds to the checking cycle on the line circuit to sequentially operate four multicontact chain switching relays in the same panel.

The Indication Panel contains eight final stick relays and receptacles to accept two Tone Receiving Units. The Office and Field Switching Units act as four gates which respond to the action of the checking cycles. Each gate is opened only during one period of the checking cycle.

U.S. & S. - 6 - U-5725

When a wayside function repeater relay is energized by a change in function conditions, an audio frequency tone from a transistorized oscillator-amplifier (referred to as the Tone Transmitting Unit) passes through one of the open gates on the Field Switching Unit to the line circuit. This tone is detected in the office or registry location by a Tone Receiving Unit. The receiver amplifies the tone and provides a circuit through the corresponding office chain relay to energize an indication relay. The indication relay remains energized as long as the tone is received and is deenergized when the function repeater relay is deenergized in the field.

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..

U.S. &S. - 9 - U-5725

III. EQUIPMENT DESCRIPTION

A. Line Pulsing Panel

Features - The Line Pulsing Panel, shown in Figure 4, is a completely transistorized unit which generates and applies a series of D. C. pulses to the two - wire line circuit. It is plug coupled and designed for mounting on a standard 19 - inch communication rack .

Figure 4 . . . Line Pulsing Panel

U.S. &S. - 10 - U-5725

This unit is powered by 55 volts A. C., 25 cps or 115 volts A. C., 60 cps and supplies 30 volts D. C. for line operation.

An L-pad attenuator and a field station selector switch on the front side of the panel permits adjustment of the load on the output transistors.

A test jack is provided to measure the line current supplied by the pulsing unit to the two-wire line circuit.

Circuit Description - Referring to Figure 5, which shows the Line Pulsing Panel schematic diagram, transistors SCI and SC2 comprise a basic oscillator which operates at approximately one cycle every 3 seconds. Capacitor CS is selected to produce the desired frequency. Transistor SCI provides an additional gain in the feedback loop to sustain oscillations at this very low rate. Both posi -tive and negative halves of the oscillator output are used. Transistors SC3, SCS, SC7, and SC9 amplify and shape one half of the sine wave while SC4, SC6, SC8, and SC10'ainplify and shape the other half of the sine wave. The amplifiers are biased in such a way that during the build up periods of the sine wave the output transistors SC9 and SCIO are non-conducting. When a certain point in the first half cycle of the sine wave is reached, however, SC9 becomes conducting and saturated. It remains conducting until the sine wave drops off. Similarly SCIO becomes conducting when a certain point is reached in the second half of the sine wave and it remains conducting until the sine wave again drops off. This is shown graphically in Figure 6.

The outputs of SC9 and SCIO are connected to the line circuit and to an Lpad attenuator which must re adjusted for each line circuit so as to maintain a constant load on the output transistors SC9 and SCIO.

During the conducting period of SC9 (approximately 1/4 cycle) line lL is energized positive with respect to 2L and during the conducting period of SCIO (also approximately 1/4 cycle) lL is energized negative with respect to 2L. These two periods during which the line is energized, are spaced by approximately equal periods during which the line is deenergized. A D. C. power supply forms a part of the Line Pulsing Panel and provides the required D. C. voltage for the unit.

B. Tone Transmitting Unit

Features - The Tone Transmitting Unit is a plug-in unit with overall dimensions of approximately 3" x 5" x 7". See Figure 7a.

The unit is available in any of the following frequencies:

1.0 KC 1.15 KC 1.3 KC 1.45 KC

1.6 KC 1. 75 KC 1.9 KC 2.05 KC

2.2 KC 2.35 KC 2.5 KC 2. 65 KC

2.8 KC 2. 95 KC 3.1 KC 3.25 KC

Any frequency can be used at any field location with the same results.

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Figu,ire 5 • . . Line Pulsing Panel Schematic Diagram

U.S. & S. - 13 - U-5725

{

PERIODS OF TIME WHEN SC10 IS NON --------.....-------- CONDUCTING DUE TO REVERSE BIASING

ON SC4, SC6, see AND SC10.

a.

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PERIODS OF TIME WHEN SC9 IS NON'----------- CONDUCTING DUE TO REVERSE BIASING

ON SC3, sc5, SC7 AND SC9.

Figure 6 ... Line Pulsing Panel Wave Shape

b.

Figure 7 ... Tone Transmitting Unit

U.S. & S. - 14 - U-5725

The Tone Transmitting Unit contains a screwdriver-adjusted potentiometer R30 (See Figure 8) to vary the output from 0. 25 volt A. C. to 0. 77 volt A. C. and will transmit a signal of +6 dbm into a 150-ohm line circuit.

The power source requirement is a nominal 12. 5 volts D. C. which is supplied from the Field Switching Unit when the Tone Transmitting Unit is plugged into it.

Circuit Description - Referring to Figure 8, schematic diagram for a typical Tone Transmitting Unit, SC7 is connected in a conventional oscillator circuit in which winding 3-5 (of Ll) and Cl form the frequency - determining circuit and winding 4-7 provides regenerative feedback. The value of Cl is selected to provide the desired frequency. Zener diode 07 regulates the D. C. volt~ge to SC7 to compensate for supply voltage variations which could otherwise cause large changes in transmitter output voltage.

The output of the oscillator is coupled to an amplifier stage SC8 through winding 8-9 of Ll. The output of the amplifier is coupled through transformer T2 to the line circuit through a series tuned filter L3 and C3 to provide a low impedance to the tone frequency and a high impedance to all other frequencies. The filter thus performs the following functions:

(a) Blocks D. C. by the action of the series capacitor, thus preventing the shorting of the D. C. line circuit.

(b) Prevents passage of harmonics of the tone frequency to the line circuit.

The values for the toroid L3 and capacitor C3 are determined by the frequency.

C. Tone Receiving Unit

Featur~s - The Tone Receiving Unit is a completely transistorized plugin board made in the same frequencies as the Tone Transmitting Unitso

A typical Tone Receiving Unit is illustrated in Figure 9. All receivers have the same external appearance and may be distinguished from one another only by the frequency stamped on the unit.

Each receiver has a screwdriver adjusted control, Rl, mounted on the top of the board to facilitate sensitivity adjustment. The unit has a maximum sensitivity of -15 dbm when connected to a 150-ohm line.

Circuit Description - Referring to Figure 10, schematic diagram for a typical Tone Receiving Unit, the tone generated by the Tone Transmitting Unit is received from the line circuit at terminals R - S and A - B. Ll and Cl form a filter having a very narrow bandpass characteristic. This filter blocks all D. C. and A. C. signals except the tone from the transmitter.

Transformer Tl matches the input impedance of the Class A amplifier SCl to the impedance of the line circuit. Potentiometer Rl, connected across the secondary of Tl, provides the receiver sensitivity control.

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U-5725

U.S. & S. - 16 -

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u.s & s. - 17 - U-5725

The output of SCI is fed through T2 to SC2 and SC3 which are part of an amplifier-rectifier arrangement providing D. C. voltage to turn on transistor SC4.

When SC4 is conducting, current flows from Bl 6 through the coil of an indication relay over the front contact of a chain (CHR) relay, through SC4 collector to emitter to R9 to Nl6.

D. Chain Relay Panel

Features - The Chain Relay Panel contains four multi-contact chain switching relays and a completely transistorized Relay Switching Unit which plugs intc a base on the Chain Relay Panel. The transistorized Relay Switching Unit responds to the checking cycle produced by the Line Pulsing Panel and sequentially operates the chain switching relays (one on each checking cycle period) to connect the individual indication re lays to their respective Tone Receiving Units for posi -tioning in accordance with the information transmitted by the field or wayside equipment.

The Chain Relay Panel, shown in Figure 11, is the same size as the Line Pulsing Panel. It is plug coupled and made to mount on a standard 19 - inch communication rack. The power requirement is a nominal 16 volts D. C. energy source. (13.5 volts D.C. minimum to 19 volts D.C. maximum). This voltage source must be well filtered and regulated.

Figure 11 . . . Chain Relay Panel

U.S. & S. - 18 - U-5725

Circuit Description - Referring to Figure 12, schematic_diagram for a typical Chain Relay Panel, when the voltage on terminal E21 (lL).is positive with respect to terminal E22 (2L) and of the proper magnitude, potentials are developed across R3 and R4. The potential across R3 is such that transistor SC3 will be in a con -ducting state. SC3 and SC4 comprise a conventional bi-stable or flip-flop circuit so that with SC3 conducting SC4 will be non -conducting. The potential across R3 will also produce a condition whereby SCI will conduct in a saturated state. With SCI conducting, the collector of SCI and the base of SC5 will be near battery potential. Hence SC5 will be non-conducting and almost the entire battery voltage will appear across R21, R25, and Cl. The charge current through Cl and R33 causes the base of SC7 to be positive with respect to the emitter. Thei:efore SC7 is in a conducting state and current from positive battery will flow through relay l CHR and SC7 to the negative side of the battery, thus l CHR will pick up during the early portion of the charging current. During this period SC2, SC4, SC5, and SC6 are a.It in the non -conducting state and hence 2CHR, 3CHR, and 4CHR relays cannot pick up.

Proceeding to the second time interval, that period of de-energization following a period of IL being positive with respect to 2L, SC3 continues to conduct, this being characteristic of a flip-flop circuit. SCI is non-conducting since its source of turn-on voltage is derived from the D. C. energy on the line circuit. When SC3 conducts, its collector is, for all practical purposes, at battery potential and SC5 will conduct since the base of SC5 is removed from battery. Thus, when SC5 is conducting, almost the entire battery voltage will appear across R23, R27, and C3. The charging current through C3 and R35 will cause the base of SC9 to be positive with respect to the emitter, causing the transistor to conduct thus picking up relay 2CHR.

Reverse line polarity (1 L negative and 2L positive) is the third condition of the sequence. This condition will switch the bistable circuit so that SC4 conducts and SC3 is non-conducting. SC2 also conducts, providing a circuit to hold SC6 in a non -conducting state, charge capacitor C2 and pick up relay 3CHR. This condition is the same as for the first time interval of the sequence, except that the other half of the switching circuit is used.

The fourth and last condition of the sequence is with the D. C. energy removed from the line following an interval of negative polarity. Under this condition SCI, SC2, SC3, and SC5 are non-conducting. SC4 continues to conduct and since SC2 is non-conducting SC6 will conduct charging C4 and picking up relay 4CHR.

The release of the l CHR, 2CHR, 3CHR, and 4CHR relays prior to the end of their respective time interval is necessary to insure that proper correspondence is established in sequence with the field switching networks.

PANEL l"TCHii' CONNECTORS L.: __ J

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.. ......__

'·

..

U.S. & S. - 21 - U-5725

E. Field Switching Unit

Features - The Field Switching Unit, Figure 13, contains a small power supply, four small function repeater relays, and a transistorized switching network. This unit responds to the checking cycle, produced by the Line Pulsing Panel and sequentially provides circuits (one for each of the four checking cycle periods) whereby the Tone Transmitting Unit is keyed ON or OFF on each period depending upon the position of the function repeater relay associated with each particular period .

a.

b.

Figure 13 ... Field Switching Unit

U.S. &S. - 22 - U-5725

These units are identical for all locations and have dimensions of approxi -mately 3-l/4"wide x 8-5/8"high x 8-7/8"deep. The function repeater relays in this unit are operated by local wayside battery over contacts of wayside relays. The small power supply in this unit is operable from either 55 volts A. C., 25 cps or ll5 volts A. C., 60 cps.

Circuit Description - Referring to Figure 14, schematic diagram for a typical Field Switching Unit, a.'1.d Figure 12, it can be seen that, except for the output circuit, this unit is similar to the Relay Switching Unit.

When the voltage on lL is positive with respect to 2L and of the proper magnitude, potentials are developed across R3 and R4. The potential across R3 is such that SC3 will be in a conducting state. SC3 and SC4 comprise a conventional bi -stable or flip-flop circuit so that when SC3 is conducting SC4 will be nonconducting. The potential across R3 will also produce a condition whereby SCI will conduct i:Q. a saturated state. With SCI conducting, the collector of SCI and the base of SC5 will be near battery potential. Hence SC5 will be non-conducting and almost the entire battery voltage will appear across R21 and the Tone Transmitting Unit if lTPR is up. The voltage divisionbetweenR21 and the Tone Transmitting Unit is such that adequate tone levels are obtained. If 1 TPR is up, the Tone Transmitting Unit will be switched on and the fact that lTPR is up will be indicated at the office or registry locations. The flow of current to the Tone Transmitting Unit in this case is through the collector of SCI, R21, 05, and lTPR up. During this interval, SC2, SC4, SC5, and SC6 are all in the nonconducting state. Hence, 2TPR, 3TPR, and 4TPR being up cannot affect the operation of the Tone Transmitting Unit.

Proceeding to the second time interval, that period of de-energization following a period of lL being positive with respect to 2L, SC3 continues to conduct, SCI is non -conducting and SC5 is conducting. Thus, when SC5 is conducting, the Tone Transmitting Unit will be switched on if 2TPR is up. During this interval, SCI, SC2, SC4, and SC6 are non-conducting and the Tone Transmitting Unit will not be affected by the positions of lTPR, 3TPR, and 4TPR.

The purpose of diode D5 is to prevent battery voltage fr_om the collector of SC5 from feeding back through 1 TPR up, R21, and 03, to the base of SC5, which would affect the conducting state of SC5. The same action is common to SC6 and D6.

The purpose of diode DlO is to prevent current from feeding back through 4TPR up, SC6, Rl8 and R20 to N 12. 5. The same action is common to 2TPR and 09.

Reverse line polarity (lL negative and 2L positive) is the third condition of the sequence. This condition will switch the bi -stable circuit so that SC4 con -ducts and SC3 is non -conducting. SC2 also conducts providing a circuit to check the position of 3TPR and also hold SC6 in a non -conducting state. This action is the same as for the first interval of the sequence except that the other half of the switching circuit is used.

U.S. & S. - 23 - U-5725

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Figure 14 ... Field Switching Unit Schematic Diagram

U.S. &S. - 24 - U-5725

The fourth condition of the sequence is with the D. C. energy removed from the line, following an interval of negative polarity. Under this condition SCI, SC2, SC3, and SC5 are non -conducting. SC4 continues to conduct and since SC2 is non -conducting, SC6 will conduct, checking the position of 4 TPR.

F. Indication Panel

Features - Each Indication Panel contains eight indication stick relays and receptacles to accept two plug-in Tone Receiving Units.

Each Tone Receiving Unit receives a signal from its assigned field station. Four indication stick relays are associated with each Tone Receiving Unit and are connected to it one at a time over front contacts of the chain relays.

Each indication relay has three front contacts and two transfer contacts for indication purposes.

Test 'jacks are provided to check the output of each Tone Receiving Unit.

The Indication Panel, shown in Figure 15, is the same size as the Line Pulsing Panel and the Chain Relay Panel. It is plug coupled and made for mounting on a standard 19-inch communication rack.

Each panel has removable plastic covers in front and back for convenient inspection.

Figure 15 . . . Indication Panel

"

PANEL CONNECTORS

I LEFT HAND UNIT VIEWED FROM FRONT OF PANEL

PANEL CONNECTORS

·, I PANEL

CONNECTORS

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Figu:11e 16 . . • Indication Panel Schematic Diagram

U.S. & S. - 27 - U-5725

Circuit Description - Referring to Figure 16, schematic diagram for a typical Indication Panel, if Tone Receiving Unit A is ON during the first period of the checking cycle, transistor SC4 will be conducting and indication relay lFl will pick up if down, or remain up if already up, when chain relay 1 CHR picks up. If Tone Receiver Ais OFF during the first period of the checkingcycle, transistor SC4 will be non-conductingandindication relay lFl will release if up, or remain released if down, when chain relay lCHR picks up. In a similar fashion relays 2Fl, 3Fl, and 4Fl will be operated by Tone ReceiverUnitAon the second, third, and fourth periods respectively of the checking cycle. Similarly, actuation of Tone Receiving Unit B will cause the appropriate response and positioning of relays 1F2, 2F2, 3F2, and 4F2 sequentially on each of the four periods of the checking cycle, and this action may occur simultaneously with the positioning of their counterpart relays lFl, 2Fl, 3Fl, and 4Fl, which are responding to Tone Receiving Unit A.

Th~ pick up circuit for each indication relay is Bl 6 on the coil of the relay over a front contact of the proper CHR relay, through a closed contact of the test jack through the collector and emitter of transistor SC4 of the Tone Receiving Unit through R9 and thence to Nl6 on the connector. The stick circuit for each indication relay is Bl 6 on the coil over a back contact of the CHR relay and a front contact of the indication relay to Nl6.

When a meter is plugged into the test jack, the indication relays together with their pick-up and stick circuits are replaced with a 125-ohm resistor which is connected directly to the receiver output.

U.S. & S. - 28 - U-5725

IV. INSTALLATION DATA

This section contains data necessary to install the equipment for the 529 Indication System.

A. General Information

Mechanical Inspection - Carefully examine every part of the system to make certain that no wires, components, screws, or nuts are loose and that all insulation is undamaged.

Fail-Safe Applications - The 529 Indication System discussed in this literature is for non-vital service where failure of the 529 equipment will not result in an unsafe condition.

Power Requirements - Each complete office rack has a power requirement of a nominal 55 volts A. C., 25 cps or 115 volts A. C. , 60 cps. Power consumption is '20 watts. In addition, each rack requires a filtered D. C. source capable of delivering 10 amperes at 16 volts D. C.

Each field unit has a power requirement of a nominal 55 volts A. C., 25 cps or 115 volts A. C., 60 cps and consumes 5 watts. A power source of a nominal 16 volts D. C. is required to operate the function repeater relays.

Line Circuit - Consult the Union Switch & Signal Engineering Department regarding the size and maximum length of the line wire.

Where the line circuit is an open pair it must be treated as a standard voice telephone circuit and must include twisted drops at each location.

If part of a signal cable, this line circuit is a potential source of interference to voice circuits in the same cable.

Lightning Protection - When used in territory normally requiring lightning protection for signaling circuits, it is necessary to provide the same conventional protection for this equipment.

Connections and Adjustments - Connection and checkout of the equipment should proceed as follows:

1. Connect the line circuit to the office rack using terminals F26 and F27 on the terminal board.

2. Using an A. C. voltmeter check the supply voltage that will be used to operate the Line Pulsing Unit. (This unit operates on either 55 volts A.C., 25 cps or 115 volts A.C., 60 cps.)

3. Connect the supply leads to the proper terminals on the ter-minal board.

4. Using a D. C. voltmeter check the D. C. supply voltage that will be used for the Indication and Chain Relay Panels, for 13. 5 volts D. C., to 19 volts D. C.

U.S. & S. - 29 - U-5725

5. Connect the D. C. voltage to the terminals provided on the ter-minal board.

6. Using a calibrated oscilloscope, check the output of the Line Pulsing Unit across terminals F26 and F27. This peak voltage shall be 30 volts ± 10% and should oscillate 18-22 times per minute.

7. Tum the FIELD STATIONS selection switch on the Line Pulsing Panel to position 18, set the LINE CURRENT CONTROL to the extreme counterclockwise position and the MANUAL-AUTOMATIC switch to the AUTOMATIC position.

8. Plug a D! C. voltmeter in the jacks marked F and H on the front of the Chain Relay Panel ahd adjust potentiometer R45 to obtain approximately 3. 5 volts D. C.

9. Insert the Tone Receiving Units in the proper receptacles in the Indication Panels.

10. Check that all connectors are properlyinsertedand lockedin the proper position in the rear of each panel.

11. If the Line Pulsing Panel is operating correctly the chain relays in the Chain Relay Panel will pick up and release in unison with the line pulses.

12. Using an A. C. voltmeter check the A. C. supply voltage that will be used for each Field Unit.

13. Connect the A. C. supply leads to each Field Unit at terminals provided in field mounting base at each location.

14. Insert the proper Field Units in the field mounting base at each location after adjusting potentiometer R29 to the value shown on the line circuit for the installation.

15. When allFieldUnitsareconnectedas above, usingacode meter, check for three-volt pulses across the unmarked terminals on top of the terminal board in the plug base at each location. If necessary, adjust R29 to get this value. If a major adjustment of R29 is required at any location, it will be necessary to recheck and, if necessary, readjust all other locations.

16. Set the proper levels for the Tone Transmitting and Tone Receiving Units as follows:

a. Connect a wave analyzer across office rack terminals F26 and F27.

b. With all Tone Transmitting Units removed and starting at the field location nearest to the office, plug in the proper Tone Transmitting Unit and connect an A. C. vacuum tube voltmeter across the Field Unit line circuit. (Do not use the field test jack for this test.) Set R30 at minimum position (extreme counterclockwise).

U.S. & S. - 30 - U-5725

c. At the office, plug a D. C. voltmeter in the Tone Receiving Unit jack corresponding to the Field Unit.

d. Check that one or more TPR relays are energized.

e. Set Rl on the Tone Receiving Unit at mid-point and adjust R30 on the Tone Transmitting Unit so that the D. C. voltmeter reads 7 volts D. C.

f. Readvoltageon wave analyzer andcompareit with the A.C. voltage at the Field Unit. If there is no indication of abnormal line attenuation, record the wave analyzer voltage for this Field Unit and at the same time read and record, for future test purposes, the A. C. voltage at the Tone Transmitting Unit test jack.

g. Repeat steps a. through f. for each field location in tum.

17. When all Field Units have been adjusted in accordance with the above procedure, plug all Field Units into their receptacles.

18. With all equipment operating normally, read and record the direct current in the Line Pulsing Panel test jack. This value will vary according to the number of Field Units and the length of the line circuit, but in no case should it exceed 180 milliamperes. Adjust R40 if necessary.

U.S.&S. - 31 - U-5725

V. FIELD MAINTENANCE

A. Field Units

With the exception of the TPR relays in the Field Switching Unit, the equipment is not subject to mechanical wear and since deterioration of the electrical components is not ordinarily detectable in advance of failure, the inspections shown below are all that are required. They may be performed at the suggested intervals or as the user deems necessary.

Make the following checks at intervals of approximately six months.

1. Visually inspect the units for the condition of cases, terminals, and wiring.

2. Using an A.C. vacuum tube voltmeter, check the output voltage at the test jack of each Tone Transmitting Unit and compare it with the original value as' recorded in Part IV - 16 - f.

3. Using a D. C. voltmeter, check the D. C. supply voltage used to energize the TPR relays for 16 volts nominal.

At yearly intervals, substitute a spare Field Unit (Tone Transmitting Unit and Field Switching Unit) and return the Field Unit taken from service to the repair shop for cleaning and checking.

B. Office Units

With the exception of the chain and indication relays, the equipment is not subject to mechanical wear and since deterioration of the electrical components is not ordinarily detectable in advance of failure, the inspections shown below are all that are required. They may be performed at the suggested intervals or as the user deems necessary.

Make the following checks at regular intervals of approximately three months.

1. Visually inspect all units for the condition of plastic covers, rubber gaskets, connectors, loose nuts and screws.

2. Observe the action of the chain relays to determine that they are operating smoothly and at 18 - 22 times per minute.

3. Using a Hewlett-Packard Analyzer Model 302A, check the receivedvoltageforeachfrequency against the values recordedinPartIV - A - 16-f.

4. Check the voltage across terminals TBA 1 - 2, TBA 3 - 4, TBA 5 - 6, and TBA 7 - 8 in the Chain Relay Panel. These voltages should normally be 13. 8 volts D. C. to 19 volts D. C. and should not be less than 12 volts D. C. If any of these voltages appear to be gradually decreasing from the initial value (with constant supply voltage) the associated power transistor may be deteriorating and should be checked more frequently.

U.S.&S. - 32 - U-5725

Make the following checks at regular intervals of approximately six months.

I. Using a D. C. milliammeter, check the line current at the test jack on the Line Pulsing Panel to determine that there is no appreciable change in the line current since installation. (See Part IV - A - 18).

2. Using a D. C. voltmeter, check the voltage at each test jack on each Indication Panel for 6 - 8 volts D. C. to determine that there has been no appreciable decrease in this voltage. If voltage is less than 5 volts D. C., adjust potentiometer Rl to raise the voltage to 6 - 8 volts D. C.

At yearly intervals, substitute a spare unit for each of the office units and return the office units taken from service to the repair shop for cleaning and checking.

,-~ . '·

U.S. & S. - 33 - U-5725

VI. SHOP MAINTENANCE AND TEST FACILITIES

Power Requirements

The following power sources are required for test operation of the 529 Indication System equipment.

1. 115 volts A. C., 60 cps or 55 volts A. C., 25 cps.

2. 16 volts D. C.

3. 16 volts A.C. (Can be 16 volts D.C.). For indication lights.

Test Equipment and Tools

The following test equipment and tools are recommended for shop testing and servicing the 529 Indication System equipment.

~' 1. A U.S. &s. PD20 code meter with ranges of O - 2. 5 - 10 - 50 volts with a sensitivity of 20, 000 ohms per volt and ranges of O - 10 - 100 - 500 milliamperes. (U.S. &s. Piece Number UJ62262).

2. An ohmmeter capable ofmeasuringfrom 1 ohm to 100, 000 ohms. (A megger must not be used, as the high voltage used could damage electrical components).

3. An A.C. vacuum tube voltmeter with 0.1 megohm minimum input impedance and with ranges of O - 10 millivolts and O - 1 - 3 - 10 - 30 volts.

4. An audio frequency oscillator with a range up to 3.25 KC.

5. An oscilloscope that can be calibrated.

6. A frequencycountercoveringtherangeof 1 KC through 3.25 KC. This counter will be used to check the frequency of the Tone Receiving Units and the Tone Transmitting Units.

7. A chronograph to measure release time of relays. (U.S. & S. Piece Number UN331542).

8. A transistor checker.

9. A wave analyz.er.

10. A U.S & S. 529 Test Rack(U.S. & S. Piece Number 00383063).

11. Tone Transmitting and Tone Receiving Units of the same fre-quency.

12. A soldering iron.

13. Long nose pliers.

14. A screwdriver.

15. A 6" crescent wrench.

U.S.&S. - 34 - U-5725

A. Tone Transmitting Unit Check and Repair

1. Remove cover and use light air pressure to blow out all dirt and foreign matter. This air must be free of oil and moisture.

2. Examine unit for visible damage, loose connections, broken wires or components.

3. Using the test circuit shown in Figure 17, make the connections shown. Set milliammeter Aoc at the O - 100 milliampere range, voltmeter Vin at the O - 50 volt range, and voltmeter V L at the O - 3 volt range.

4. Close switch SWl and conduct the following tests:

Condition of Test

a. Set potentiometer R30 at : .. ' minimum position.

b. Set potentiometer R30 at maximum position.

2

N12.5

12.5V. DC

IN

L~. 680"'

ELECTRONIC COUNTER

CONNECTOR

Results

VL = 0. 77 - 1.2 volts A.C. Aoc = 10 milliamperes

VL = 0.23 - 0.3 volt A.C. Aoc = 14 milliamperes

TONE TRANSMITTING UNIT

Figure 17 . . . Tone Transmitting Unit Test Circuit

U.S.&S. - 35 - U-5725

5. If the results shown in step 4 are obtained, and the frequency is within ± 5 cps of that shown on the nameplate, return the unit to service or stock.

6. If the results shown in step 4 are not obtained, make the following voltage checks at the indicated check points on the printed circuit boards.

PRINTED CIRCUIT BOARD A

Check Points D. C. Voltage Check Points A. C. Voltage

+ -6 - 5 8.6 3 - 5 6.2 5 - 1 3.6 7 - 6 0.3 6 - 7 1. 7 2 - 5 0.17 2 - 5 7.0 9 - 8 0.056

~ ' 4:.. 3 7.2 4 - 2 0.14

PRINTED CIRCUIT BOARD B


+ -1 - 12 0.195 5 - 4 0.025

12 - 8 12.4 7 - 5 9.4 4 - 7 12.4 7 - 8 9.4 4 - 5 0.14 6 - 2 3.9

If the voltage reading at any point is not consistent with the listed value, check and replace components affecting circuits at check point.

7. If values observed in step 6 are consistent with the listed values, repeat steps 4 and 5.

B. Tone Receiving Unit Check and Repair


2. Using the test circuit shown in Figure 18, make the connections shown and conduct the following tests.

U.S.&S. - 36 -

INPUT (LOW SIDE)

OUTPUT

U-5725

T1[5c 2

1

PART OF TONE RECEIVING UNIT CIRCUIT

CONNECTOR

Figure 18 ... Tone Receiving Unit Test Circuit

Condition of Test Action or Results

a. V DC should be exactly 15 volts D. C. Adjust RX to Aoc should not exceed 200 O ohms. Close switch SW 1. milliamperes.

b. Adjust Rl to maximum clockwise position.

Close switch SW2 and adjust input voltage V 1 to approxi - V L should not exceed 12 mately O. 2 volt A. C. volts D. C.

c. Check unit for specified frequency ± 5 cycles. With switches SWl and SW2 closed, adjust RX until V1 = V2. Note value of RX

d. Adjust RX to O ohms and adjust V l until V L = 14. 5 volts D. C. Note value of V 1

·'

U.S. & S. - 37 -

e. By using the value of RX obtained in step c. , the value of V 1 obtained in step d., and the nomograph shown in Figure 19, determine the sensitivity in DBM.

U-5725

Should be -15to -20 DBM

3. If the calculated sensitivity falls within the limits indicated and the frequency is within± 5 cps of that shown on the name plate, return the unit to service or stock.

4. If the results shown in steps 2 and 3 are not obtained, adjust the test circuit as follows, and make the voltage checks at the indicated check points.

a. Close switches SWl and SW2.

b. Adjust RX to zero

c. Set potentiometer Rl to maximum clockwise position.

d. Adjust VL to 14.5 volts D.C.


+ -6 - 4 0.15 RS - AB 0.07 6 - 5 13.5 2 - 3 0.004

FH - 12 1.45 5 - CD 0.99 9 - CD 0.5 11 - 13 l. 2 6 - 3 0.15 12 - 11 0.16 7 - CD 0.34

NP - 7 0.06 9 - ·7 0,17

If the voltage check at any point is not consistent with the above tabulation, check and replace defective components as necessary and repeat voltage checks. If all voltage checks are then in agreement with the listed values, and the frequency is within ± 5 cps of the proper frequency, return the unit to stock or service.

C. Field Switching Unit Check and Repair

1. Remove cover and use light air pressure to blow out all dirt and foreign material. This air must be free of oil and moisture.


3. Plug unit into the Test Rack field mounting base and plug in the standard Tone Transmitting and Tone Receiving Units.

U.S.&S. - 38 - U-5725

5000 100

4000 +30

3000

20 +20 2000

10

+10'

1000 900

1.0 800 0 ..... 700 ..... .....

600 ' ..... .....

' ...... 500

-10 .......

..... 400 .....

' ' 0.1 ' ....... 300 ...... .......

-20 ' ....... .....

' 200 .......

' .......

' - 30 ' 150 .01 '

100

-40 90 80 70

.001 60

-50 50

40 35

-60 30

.0001 25

20 • -70 NOMOGRAPHIC SOLUTION OF

THE EQUATION 15

DBM:: 10 LOG v1z

-80 .00001 0.001 Rx

10

DBM RMS OHMS ,-VOLTS Vi Rx

Figure 19 . . • Nomograph for Computing dbm from Voltage Measurements

'{". .

U.S.&S. - 39 - U-5725

4. Turn power on Test Rack.

5. Connect a calibrated oscilloscope across unmarked terminals on top of terminal board of field mounting base and adjust potentiometer R29 to obtain a 3-volt reading on the oscilloscope.

6. When the lTP, 2TP, 3TP, and 4TP switches are turned to the ON position the indication lamps should light and stay lit until the TP switches are turned to the OFF position.

7. If one or more sets of indication lamps fail to light, tum the AUTOMATIC - MANUAL switches on Test Panel and Line Pulsing Panel to the MANUAL position and the HAND STEP switch to positions 1, 2, 3, and 4 in order and observe the action of the chain relays.

If chain relays pick up and release in order as the HAND STEP switch,.is tum7d to its four positions, but certain indication lamps do not light when TP switches are all in ON position, check.for trouble as follows:

a. Connect a D. C. voltmeter across circuit points 8 (positive lead) and 1 (negative lead) onprinted circuitboard A and circuit points 9 (positive lead) and 1 (negative lead) on printed circuit board B, and check for 12-14 volts D. C. If no voltage is present, check the D. C. and A. C. voltages at the rectifier terminals and the D. C. voltage across C4 and R31. Replace defective components, if necessary, and recheck.

b. Set all TP switches to the ON position and check that all TPR relays are energized.

c. Set the HAND STEP switch to the position where lamps fail to light.

d. With HAND STEP switch in position 1, connect a D. C. voltmeter (10 volt scale) across the' following circuit points on printed circuit board B and observe the results.

Condition of Test Results Remarks

+ - D.C. Volts

18 - 10 O or approximately 8 If approximately 8 volts adjust con-tact on 1 TPR relay. (See U.S. &S. Service Specification SU -4545.)

17 - 10 0. 3 or approximately 8 If approximately 8 volts check 05 for open circuit.

7 - 10 1. 4 or approximately 8 If approximately 8 volts check R21 for open circuit.

U.S. & S.

15 - 10

9 - 10

checks.

Condition of Test

+ -

6A - 10

: .. \

6 - 10

2 - 10

3 - 10

9 - 10

- 40 - U-5725

1. 4 or approximately 8 If approximately 8 volts check SCl for open circuit.

1. 6 or approximately 8 If approximately 8 volts check Rl 1 for open circuit.

Replace open components and recheck.

e. With HAND STEP switch in position 2, make the following

Results

D. C. Volts

O or approximately 8





Remarks

If approximately 8 volts adjust contact on 2TPR relay. (See U.S. &S. Service Specification SU-4545.)

If approximately 8 volts check D9 for open circuit.

If approximately 8 volts check SCS for open circuit.

If approximately 8 volts check Rl5 for open circuit.

If approximately 8 volts check SC3 for open circuit.

Replace open components and recheck.

Since the circuits for HAND STEP switch positions 3 and 4 are identical to those for positions 1 and 2, the same checks for open circuits should be made for these positions.

8. To check for short circuits in switching transistors, proceed as follows:

Condition of Test Result Remarks

HAND STEP TP Switch Lights Lit Switch Position Position

1 lTP ON #1 Normal 2 lTPON #1 & #2 Check SCl for short circuit 3 lTP ON #1, #2, & #3 Check SCI for short circuit 4 lTP ON All Check SCI for short circuit

1 2TP ON #I Check SC3 and SCS for short circuit 2 2TPON #1 & #2 Check SC3 andSCS for short circuit 3 2TPON #1, #2, & #3 Check SC3 and SCS for short circuit 4 2TPON All Check SC3 and SCS for short circuit

,. .

U.S. &S. - 41 - U-5725

1 3TP ON #1 Check SC2 for short circuit 2 3TP ON #1 & #2 Check SC2 for short circuit 3 3TP ON #1, #2, & #3 Check SC2 for short circuit 4 3TP ON All Check SC2 for short circuit

1 4TP ON #1 Check SC4 andSC6 for short circuit 2 4TP ON #1 & #2 Check SC4 and SC6 for short circuit 3 4TP ON #1, #2, & #3 Check SC4 and SC6 for short circuit 4 4TP ON All Check SC4 and SC6 for short circuit

Replace shorted transistors and recheck.

D. Chain Relay Panel Check and Repair

1. Examine unit for visible damage, loose connections, broken wires or components, or relay contacts out of adjustment.

2. Install panel in Test Rack and make necessary connections.

3. Set the MANUAL - AUTOMATIC switches on Test Panel and Line Pulsing Panel to MANUAL position.

4. Turn POWER switch to ON position.

5. Turn HANDSTEP switch to #1 position.

6. Plug a D. C. voltmeter in the jacks marked F and H on the front of the panel and adjust potentiometer R45 to obtain 3 - 4 volts D. C.

7. 1 CHR relay should pick up, stay up for 100 to 400 milliseconds, and drop out.

8. If lCHR relay does not pick up, jumper out capacitor Cl and make the following voltage checks.

Check Points Results

Across Coil of 1 CHR 13. 5 to 19 volts D. C. MN -CD 13. 5 to 19 volts D. C. 24 - CD 13.5to 19volts D.C. 26 - CD 13. 5 to 19 volts D. C. 29 - CD 13.5 to 19 volts D.C. 30 - CD 13. 5 to 19 volts D. C.

If indicated voltage is not present at check points, check for defective components in circuit, including diode D5 across the coil of lCHR.

9. Next turn HANDSTEP switch to #2 position and 2CHR relay should pick up, stay up for 100 to 400 milliseconds, drop out. If 2CHR relay does not pick up, jumper out capacitor C3 and make the following voltage checks.

U.S. & S. - 42 - U-5725

Check Points Results

Across coil of 2CHR 13. 5 to 19 volts D. C. MN - CD 13. 5 to 19 volts D. C. 19 - CD 13. 5 to 19 volts D. C. 25 - CD 13. 5 to 19 volts D. C. 27 - CD 13. 5 to 19 volts D. C.

If voltage is not present at check point, check components in circuit.

10. Since the circuits for the 3CHR and 4CHR relays are identical to circuits for the 1 CHR and 2CHR relays they should be checked in the same manner.

11. Adjustments on the CHR relays should be made in accordance with U.S. & S. Service Specification SU-4562.

E. Indicafion Panel Check and Repair

1. Examine the visible signs of damage, loose connections,broken wires, components or relay contacts out of adjustment.

2. Install panel in Test Rack and make necessary connections.

3. Plug in a Tone Transmitting Unit and a Tone Receiving Unit of the same frequency.

4. With the Test Rack in AUTOMATIC position, turn the POWER switch ON and check that the following conditions are met:

(a) Chain relays are operating at the rate of 18 - 22 times per minute.

(b) Indication lamps IA, 18, and lC are lighted when switch 1 TP is turned to ON position.

(c) Indication lamps 2A, 28, and 2C are lighted when switch 2TP is turned to ON position.

(d) Indication lamps 3A, 38, and 3C are lighted when switch 3TP is turned to ON position.

(e) Indication lamps 4A, 48, and 4C are lighted when switch 4TP is turned to ON position.

5. If lights do not light, use a D. C. voltmeter and check for 6 volts D. C. minimum at Test Jack on same side as Tone Receiving Unit. If voltage is present and indication relays do not pick up, check for loose connections or broken wires in cable and connectors between the indication and Chain Relay Panels. Also check proper contact on CHR relays for continuity.

6. Check indication relays in accordance with U.S. & S. Service Specification SU-4562.

. ------

U.S. & S. - 43 - U-5725

F. Line Pulsing Panel Check and Repair

1. Examine unit for visible signs of damage, loose connections, broken wires, or components.

2. Install panel in Test Rack in place of standard panel and position the Test Panel and Line Pulsing Panel switches as follows:

Switch Position

AUTO - MANUAL AUTO HANDSTEP 1 lTP OFF 2TP OFF 3TP OFF 4TP OFF INDICATION TRANSFER LEFT LINE ATTENUATOR Extreme Counterclockwise POWER 1RANSFER RIGHT POWER SWITCH OFF FIELD STATIONS 6 MANUAL - AUTOMATIC AUTOMATIC LINE CURRENT CONTROL Extreme Clockwise

3. On the Field Unit mounting base, adjust potentiometer R29 to obtain approximate 1 y 4. 0 volts across the unmarked terminals on the base.

4. Make the following checks:

Conditions and Check Points Results

Place POWER switch in ON position 22A - 3A (Printed Circuit Board A) 30 volts D. C. ± 10% 3B - lB (Printed Circuit Board B) 30 volts D. C. ± 10%

5. With the same conditions existing as in step 4., connect a calibrated oscilloscope to the following points and observe the pattern, which should be similar to the typical pattern shown.

Check Points Typical Oscilliscope Pattern

1B - 23A

3A - 17B

U.S. & S. - 44 - U-5725

6. With the above wave shape shown on the oscilloscope, adjust CS so that lCHR picks up and releases at the rate of 18 - 22 times per minute.

7. Connect the oscilloscope across terminals lL - 2L on the Test Panel and check that the wave shape and peak voltages are as shown below.

+ 60V.

t

If the wave shape and voltages are as indicated, return the unit to service or stock.

8., If the Unit does not pulse, make the following checks using the equipment indicated.

Conditions and Check Points Results

Use a calibrated oscilloscope:

3A - 8A 8. 6 volts 2A - lA 0. 79 volt 9A - 22A and 38 - 48 0. 4 volt 12A - 14A and 68 - 88 3. 6 volts 13A - 14A and 98 - 88 0. 79 volt 16A - 18A and 118 - 128 5. 2 volts 18A - 20A and 128 - 158 0. 55 volt 17A - 14A and 88 -138 0. 55 volt 20A - 22A and 38 - 158 1. 2 volts

Use a D. C. voltmeter:

3A - 6A 8.0 - 8.4 volts D.C. 6A - 7A 0. 95 - 1.0 volt D.C. SA - 7A 0.8 - 1.4 volts D.C. (pulsing) 2A - 7A 8. 7 - 9.0 volts D.C. 2A - 3A O. 36 - 0. 39 volt D. C. 3A -4A 0. 0 - 0. 8 volt D. C. (pulsing) 3A - 7A 9.0 - 9.8 volts D.C.

If the voltage reading at any point is not consistent with the listed value, check each component associated with the check points and, if necessary, replace the component.

..

U.S. & S. - 45 - U-5725

NOTES

/

..

..

U-5725 (ADDENDUM)

MARCH, 1962

Addendum Sheet No. 1 to Instruction Pamphlet U-5725, Installation and Maintenance-Instructions for the 529 Indication System.

\

This addendum sheet contains information which is to be added to your copy of Union Switch & Signal Instruction Pamphlet U-5725, dated December, 1960.

Please change your copy in accordance with the following information:

1. On Page 10 Paragraph 1, add the following:

"Listed below are the primary transformer connections (See Figure 5) necessary to operate the Line Pulsing Panel from 55V or 115V A. C. source.''

Volts

115

55

Freq.

60 cps

25 cps

Rack Plug Connector Connect to Source Jumper

1 - 6

1 - 2

5 - 3

1 - 3 2 - 4

2. On Page 10 Paragraph 8, add the frequencies of 0. 85 KG and 3. 4KC.

3. On Page 14 Paragraph 1, ,eliminate the words "and will transmit a signal of +6dbm". '

4. On Page 22 Paragraph 1, add the following: "Listed below are the primary transformer connections (see Figure 14) necessary to operate the Field Switching Unit from 55V or 115V A. C. source.·

Field Base Plug Connector Volts Freq. Connect to Source Jumper

115 60 cps 9 - 16 10 - 15

55 25 cps 9 - 10 9 - 15 10 16

5. On Figure 14, change the wire colors on transformer Tl to the following:

!Pl BRW 1P2 - GW 2Pl - BRY 2P2 - GY Secondary wire - R Secondary win~ - R

Union Switch & Si.gnal, Division of Westinghouse Air Brake Company

..

6. On Page 28 Paragraph 4, eliminate the sentence "Power consumption is 20 watts." and substitute "and requires lOVA."

7. On Page 28 Paragraph 5, eliminate the words "consumes 5 watts" and substitute "requires 1. 8V A. "

8. On Page 28 Paragraph 12, add the following: "For primary connections see Page 10."

9. On Page 28 Paragraph 14, eliminate the words "13. 5 volts D. C., to 19 volts D. C. " and substitute "nominal 16 volts D. C. "

10. On Page 29 Paragraph 2, eliminate paragraph number "6" and substi-tute "7" .

11. On Page 29 Paragraph 3, eliminate paragraph number "7" and substi-tute "6".

12. qJ\ Page 29 Paragraph 4, insert "3 ± . 2" in place of "3. 5''.

13. On Page 29 Paragraph 9, add the following: "For primary connections see page 22. "

14. On Page 30 Paragraph 3, insert "6 to 8" in place of "7".

15. On Page 30 Paragraph 7, insert "250" in place of "180".

16. On Page 31 Paragraph 4, insert "part IV-A-16-f" in place of "part IV-16-f".

17. On Page 33 Paragraph 7, eliminate the words "that can be calibrated" and insert "(Similar to a Hewlett-Packard Model 120-A").

- 2 -

529 indication system for the .. installation and ... · transistorized unit which generates and...

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