INTRODUCTION

WABCO

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INSTRUCTION PAMPHLET U-5824

STYLE SS-1 OVERSPEED DETECTOR

* * * * * * * * *

The SS-1 Overspeed Detector is an electronic device used in conjunction with cab signal equipment to provide overspeed protection. The unit is designed to permit maximum allowable speeds in accordance with cab signal indications.

A block diagram of the overspeed system is shown in Figure 1 and will be referred to in the following description.

MAGNETIC PICK-UP

ZERO ~--..,. VELOCITY

& SHAPER

0 \

DRIVE GEAR

LIMITER

LOW PASS Fl L TERS

LOW PASS Fl LTERS

PRINTED IN U.S.A. B0.68-500-1221.2

180 CODE I I I

120 CODE I I I I I I

75 CODE I I I I I L--------..1 CAB SIGNAL RELAY CONTACTS

Figure 1

LEVEL DETECTOR

RELAY DRIVER

WESTINGHOUSE AIR BRAKE COMPANY SIGNAL & COMMUNICATIONS DIVISION Swissvale Post Office, Pittsburgh, Pa. 15218

OSR

~

Dec., 1968

WABCC ~

A pick-up device, sensitive to the passage of ferrous metal through its magnetic field, delivers an output when the drive gear is in motion. The output approximates a sinusoidal waveform and the frequency is proportional to vehicle speed. A shaper-limiter circuit, by means of a flip-flop and a specially designed clipper, produces a square wave output of one-half the input frequency and limited to a precise amplitude. With the amplitude and waveshape precisely defined, it is possible to set the overspeed detection speeds statically. The low pass filters that follow have a frequency vs. output voltage characteristic as shown in figure 2.

I

OUTPUT I VOLTAGE

FREQUENCY OR SPEED - 51 52 53 54

MAXIMUM ALLOWABLE SPEED

Figure 2

_ DETECTION POINT OF LEVEL DETECTOR

It is to be noted that the general characteristic of the filters is a rela­tively constant output at low and moderate speed and a rapidly declining output when the speed approaches the overspeed detection point.

Cab signal relay contacts select the output of a particular filter in ac­cordance with the maximum allowable speed. In figure 1 for example, with all relays deenergized, the lowest speed (Sl) is selected.

With a particular filter thus selected, the vital level detector monitors the filter output voltage to detect when the overspeed point has been reached. As long as the speed is below the selected filter's range, the vital level detector will deliver a -de output to the relay driver which maintains the OSR energized. When the speed is greater than the selected filter's range the output of the level detector goes to zero and the relay driver de-energizes the OSR, indicating an overspeed condition exists and braking action is to be taken,

When the vehicle is stopped, there is no output from the magnetic pick-up which would normally cause the OSR to de-energize. This lock-out condition is prevented by the Zero Velocity and Shaper Limiter board. Using the inductance of the magnetic pick-up, a coded oscillation is developed which simulates a speed satisfactory to the speed filter and keeps the OSR energized. Once the vehicle is moving, the oscillation stops and the circuitry acts on the output of the pick-up as previously described.

U-5824, p. 2

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CIRCUIT DESCRIPTIONS AND TESTING

ZERO VELOCITY AND SHAPER LIMITER (UN451043-4301)

Circuit Description

The Zero Velocity and Shaper Limiter circuit performs three (3) functions. The input from the magnetic pick-up is on pin H. The output to the speed filters is on pin C., When stopped, a coded signal is present on pin H. It is demodulated, divided in half and limited to 5. 6 volts peak-to-peak square wave at pin C. When the vehicle is in motion, a frequency proportional to speed is present at pin H. This is then amplified, divided in half, and limited to a 5. 6 volts peak-to-peak square wave on pin C. An 18 volts peak-to-peak square wave is available on pin P which can be used to operate a speedometer circuit. A + 10 volts available on pin M is used to turn the speedometer circuit off at zero speed.

Testing

With the test setup below, the output at pin C should be a 5. 6 volts peak­to-peak square wave at a frequency of 11 to 15 Hz, and the voltage at pin M should be +10 volts.

Close Sl, with an input of 5 to 40 volts peak-to-peak at frequencies from 20 Hz to 3 KHz. The output at pin C should be 5. 6 volts peak-to-peak at one-half the input frequency.

51

AUDIO OSCILLATOR

FREQ. COUNTER

+2s voe lA M

H

MAGNETIC PICKUP ( UJ738109)

ZERO VELOCITY & SHAPER LIMITER (UN451043-4301)

U&V

c

OSCILLOSCOPE

U-5824, p. 3

c I

C,Jl (I) Nl ..i:.

"Cl . ..i:.

H

Rl4

~._, ~ 25·45-, +uov

ILJL.i.v

'Dt·5Z!o DS

OV

M~_,,-...._,.,.,.,._ __ -\'---,--,-+oo>---,

"'

\

I I ov •• I J I ~• ,-25-45 ~11v

l25'.':isJ

~+'ZSY

l-z5.:j'5...j +8v ------ov _nrr~::·;~ ~

_ .... , - '"' + 14 ~

- - .!' i~ - - - .. - ,'l.,

~ ~--=!~~v p~ LJ L ov.

----~-.----+---------~~_....-,--------.. •+2av

~ +z 8

-+zt.sv

06 l)I·!tlS

l>13

<lO

Ill( 111(,

'"' RU IOK

Schematic of Zero Velocity and Shaper Limiter

.,. ,., . RlB 10•

Rl1 300 "· R10

c

/~R1Z li ~3.':!tl<:.

_.......__ ____ ~--+-...._--~N"o ..n...Il...::.- - + ...... ,,

-•+!J.OV

~I

LOW PASS FILTERS UN451043-09XX

Circuit Description

(There are a variety of filters and the last two numbers of the piece number suffix determine the frequency for which the filter is designed.)

R.ESISTORS &. CAPAC.\,-ORS W\''TH '/ALOE. OrvH'TTE..t) VAR'/ Wl'TH 5=REQUENc..._,, 5££. 5UFF'IX. "'fASULA"ttON,

Schematic Diagram of Low Pass Filters

As shown in the schematic diagram, there are two low-pass filters and two audio amplifiers on each printed circuit board. The filter consists of four

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RC networks each separated by an emitter follower to prevent loading of one section on another. To insure safety of the overspeed detection system, it is im­portant that no component failure can occur to increase the output. Four terminal capacitors are used so that if any lead becomes detached, it will open the signal path.

Each filter is followed by an adjustable low gain amplifier; gain adjust­ment is used to set the overspeed detection point at the time of manufacture and to provide a means of compensating for wheel wear over the years that the equipment is in service.

U-5824, p. 5

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Testing

2.0 MFD IO : I -r <~ ,,NPUTI

I 10 K

+28V DC

A p

~>' OUTPUT

~M

VTVM

> OUTPUT

I

1'

LO\/./ PASS Fl L TER

UNDER TEST

l U&V

With an input of 2. 6V rms, the output at terminal B and terminal M shall be adjustable to 1. 75V rms over the frequency range stamped on the printed circuit board. The outputs .at B and M are adjustable by R29 and R 16 respectively.

LEVEL DETECTOR UN451043-1402

Circuit Description

The Level Detector is used to detect the amplitude of the ac signal output of the low pass filters and provides a de output for ac inputs greater than 1. 5V rms and no output whenever the input is less than 1. 5V rms. Circuit operation is as follows:

+2BV A ?---<>----e~~--.-~~~~~~~~~~~-.~-.-~-.--~-.-~~~~~--.~--.~-.-~~-.-~~-,

(\ (\ '1,u \J

1.75 V. Rcv,s

u-v G.ND.

R'Z IOOK

U-5824, p. 6

RH 15K

R4 !.SK

1) I D1525

DI-52$ D'l

C3 + 210 MFD

---- GND .

JiLJ1 3V

. 7 \.

Schematic Diagram of Level Detector

1.l'c,~

RZI

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The ac input is rectified to produce a de voltage proportional in amplitude to ac input and to power a 125 Hz multivibrator. Output from the multi vibrator is, in turn, amplified to operate a neon bulb raysistor. The raysistor's resistance variations are converted to a voltage variation which is power amplified and rec­tified to deliver a de output voltage. The circuit is intended for operation over a frequency range of 10 to 4 KHz but response time of the raysistor is not fast enough to operate directly 4 KHz and, therefore, the input is converted to a 125 Hz frequency via a multivibrator; 125 Hz is well within the switching capability of the rays is tor. Circuit safety is based on the fact that a neon bulb cannot be made to turn on at a lower voltage and all the amplification ahead of the raysistor is linear. Therefore, if the power supply voltage increases or decreases, the sen­sitivity will not increase and any component failure will not result in an increased sensitivity.

Transistors Ql and Q2 form a Darlington amplifier to increase the power level of the input signal. This stage is followed by a half-wave voltage doubler that develops a negative de voltage proportional to the input amplitude, and is used to power a 125 Hz multivibrator consisting of Q3, Q4 and Q5. Transistors Q6, Q7 and QS form a power amplifier. Adjustable emitter degeneration by means of Rl4 is used on Q6 and is used to fix the gain to establish an operating sensitivity of 1. 5V rms. The output of Q8 is coupled through a transformer to increase the voltage to the firing point of the neon raysistor (approximately 68V). The trans­former output is referenced to ground via D5 so that the raysistor is switching at 125 Hz instead of 250 Hz because of its poor frequency response. A voltage divider is formed by the resistive element of the raysistor and Rl8 to convert the resistance variations into an ac signal. Transistor Q9 is a switching stage based on the base to emitter breakdown voltage; it will switch when the collector voltage of Q9 exceeds 9V p-p. This stage was added to reduce hysteresis because it requires a specific level to operate. At voltages very near the operating point of the neon bulb, the resistance variation of signal at the divider is erratic. Thus, by adding the switching stage, it insures positive action only when the resistive element is changing dramatically. An emitter follower Qll then operates a half­wave doubler to produce a negative de output.

Testing

With the test setup shown below, the output shall be -25 ±2V de when the input is increased above J. 5V rms at any frequency between 100 Hz and 4 KHz. The output shall be zero when the input is reduced to less than 1. 3V rms.

U-5824, p. 7

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INPUT

N

At28V DC

LEVEL DETECTOR UNDER TEST

UN451043-1402

yu&v RYT r--------,

I I F GI I I I I

I

C OUTPUT

10 K 1/2 W

UNMARKED TERMINALS TRANSFORMER REFERENCE UTC SPECIAL SERIES TYPE S-5 WABCO PART NO. UJ731300

RELAY DRIVER UN451043-ll02

Circuit Description

The relay driver consists of a phase shift oscillator and power amplifier. The oscillator requires -25V de supplied to terminals E and F from the level detector. It may also be used as an AND gate by supplying the voltage at each terminal from separate sources. The output of the oscillator is applied as an input to an ac power amplifier. The output of the power amplifier is rectified and filtered to drive a GJ relay.

The phase shift oscillator comprises transistors Q l and Q2, and associa­ted components. Transistor Q2 is an emitter follower amplifier. Resistors R5, R6, R7 and capacitors C2, C3 and C4 form a low pass filter. Transistor QI is a voltage amplifier and inverter. In order for the circuit to oscillate, the input to the base of Q2 must be in phase with the output at its emitter. This is achieved by shifting the phase of the output of Q2 by 360 ° and feeding it back to the base. The phase shift is accomplished in two steps. At one particular frequency, there is a 180 ° shift across the low pass filter, This particular frequency is the fre­quency at which the circuit oscillates, The output of the filter is applied to the base of Q 1. Q 1 amplifies this signal and inverts it providing the additional 180 °

shift required. The oscillator has an output of 22V p-p at approximately 3 KHz.

The oscillator output is capacitively coupled by C5 to the base of Q3. Q3, Q4, Q7 and associated components comprise a driver stage for a complemen­tary emitter-follower power amplifier. Q3 and Q4 are connected to provide a voltage gain of about l. 7. This is sufficient voltage gain to drive Q4 into clipping on both positive and negative peaks of the cycle, but not enough to operate it as a switch. This adequate gain for reliable operation over the temperature range is assured, but problems due to strong regeneration between Q3 and Q4 are

U-5824, p. 8

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avoided. Q7 is a switching transistor which insures that base of Q5 is pulled up to +28V de during the half cycle when it conducts.

Q5 and Q6 comprise a complementary emitter follower to provide suffi­cient power for a GJ relay. The output of Q5 and Q6 is rectified and filtered by a half wave voltage doubler connected between the emitters of Q5 and Q6 and the +28V de output is approximately +23V de across the GJ relay.

Testing

E -5Vt F

+28V DC

A

RELAY DRIVER UNDER TEST

U N45 1043-1102

U&V

300 \! 0-50 V

B

With the above setup, there should be 23V ±lV de across the 300 ohm load resistor. With the voltage at E and F decreased to -15V ±lV, the voltage across the load resistor should decrease to OV.

+28 A~~~~~~~------<1>--~~~~~~--+-~--<1>----.~----------41---.---.---~

-'2.S

E----- R4 27K

-'2.5

F

DX-525

1)1

C7 100

+ Ml'D

+

ce ,o""""D Cl

\ U·V~--<>--+---e----_..---+----4---1----+-4-~-4>--~.._---\-___..----\----..--J GNI>.

GND.-ri'T

-1.tv.J v

Schematic Diagram of Relay Driver

U-5824, p. 9

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VOLTAGE REGULATOR UN451043-1502

Circuit Description

GtJl)

+2BV ,---------~---------~,,___.,. A

MRI032B

DI

21(. 'R \

~ Q\

I I 1 +1 cJ 2BV. 100!'111'1> T 2 3000 Pl' '-..::>'I'-;;=--:-'

C.I Ml'D C.3

l5C rt,_

351/, R3

D3 150 .n.

IH30'l.4A

2N3055 Q3

-+ J ;noo RCo ·..1... f

C.41MFD 510 .J'-

1

------ 21 v.

R7 (,.13.l>)

1Nl358A

u-v~--------------------.-----------+-------~

Schematic Diagram of Voltage Regulator

The Voltage Regulator is designed to deliver up to one ampere at 28V de with input voltages ranging from 30 to 42V de.

Transistor Q3 is the series regulating element; its base current is supplied through R3 and R4 in parallel. The reference diode D4 sets the emitter voltage of Q4 at 20V. A variable shunt is provided by Q4 to the base current of Q3. If the 28V output tries to increase, Q4 will be driven toward saturation because its base voltage will become more positive. Driving Q4 toward saturation will shunt more current away from Q3 to ground and cause the output voltage to remain close to 28V. If the output tries to decrease, Q4 will come out of con­duction and allow more base current to flow into Q3 and thus maintain the output at 28V.

During normal operation Q 1 is in saturation and is the base current source for Q3. Q2 controls the base current of QI to keep it in saturation. The emitter voltage of Q2 is referenced at about 27V which is 8V less than the collector voltage of Ql during normal operation. The 28V output is fed back through D2 to the base of Q2 to keep it in conduction. If the output is shorted, the output voltage goes to zero and there is no voltage fed back to Q2. Transistor Q2 goes out of conduction which cuts off Ql which in turn cuts off Q3. Thus under a shorted condition the regulator will not deliver any appreciable current into the short.

Overvoltage and surge protection are provided in the following manner: The regulator is expected to operate over a normal voltage range of 30 to 42V. If an abnormally high voltage is applied, Q2 will become reverse biased cutting off base current to Ql which in turn will cause the output voltage to decrease. Surge protection is provided by the low pass filter consisting of Ll, Cl, C2 and C3. The inductor offers significant impedance to impulse spikes appearing at the input and the capacitors offer a shunt path to ground preventing high voltage transients from entering the regulator and destroying the semiconductor components. Diode Dl is

U-5824, p. 10

included to prevent the application of the wrong polarity from causing damage to the regulator.

R7 is a factory determined resistor that is used to set the output at 28V and will vary in value from one unit to another; its nominal value is 1. SK.

Testing

INPUT

+ POWER SUPPLY OT040V, lA

s

VOLTAGE REGULATOR UNDER TEST

UN451043-1502

U &V

A OUTPUT

(LOAD) 50 !2 25W

DC VOLTMETER

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With input variations of 32 to 42V de the output shall be within 27. 5 to 29. 5V de under no load and with a 50 ohm resistive load. Shorting the output shall not result in damage to any component and the output shall recover when the short is removed.

Should it be necessary to readjust the output voltage for any reason, the following procedure is recommended:

1. Remove R7.

2. Insert a decade resistor box in place of R7 with its value initially set at 5K.

3. Reduce the decade resistor until the proper valve is found to produce a 28V output with a 36V input.

4. Solder in the nearest commercially available l/2W carbon resistor.

It is important to start with too high a value of R7 and work down. If the initial value of R7 is selected too low it can cause C4 to short.

U-5824, p. 11

WABCO 'V':'V'

INSTALLATION AND ADJUSTMENTS

INSTALLATION OF ELECTROMAGNETIC PICK-UP

The electromagnetic pick-up should be mounted . 015 to . 040 inches from the outer edge of the gear. A convenient means of positioning the pick-up is to advance it until it touches the outer surface of the gear, and then turn it back one­half turn. Tighten the lock nut, making sure the pick-up does not turn. The thread size is . 625-18 UNF, therefore, each full turn will move the pick-up . 0555 inches.

As vvas mentioned in the Introduction, for reasons of safety, the pick-up should not be used without a pressure switch that opens the output leads if the pick-up moves.

ADJUSTMENT OF OVERSPEED DETECTION POINTS

The output frequency of the pick-up is related to car speed by the following equation:

F/MPH

where

5. 61 N D

F /MPH = cycles/sec. /mph

N number of teeth on the axle gear

D diameter of wheel in inches.

The above equation applies equally well whether or not the pick-up is sensing the axle gear or the motor gear because the number of teeth that pass the pick-up per unit of time is the same in either case. As a convenience in solving the above equation, refer to figure 3 where F /MPH is plotted against the number of teeth and various wheel diameters. As an example, in determining the frequency I MPH, assume 100 teeth on the axle gear and 36 inch diameter wheels. From the graph of figure 3, it can be seen that this combination of gear teeth and wheel diameter results in a constant of 15. 6 cycles/MPH. The output frequency of the pick-up at any speed is then the speed in MPH times 15. 6.

A further examination of figure 3 will reveal that as the wheel diameter de­creases from wear and periodic grinding, the frequency per MPH will increase. Since the overspeed detection points are based on a fixed frequency, the speed at which overspeed is detected will decrease proportionately as the wheels wear. To compensate for wheel wear, an adjustment is provided on each filter. The procedure is to measure the wheel diameter and determine the frequency /MPH from figure 3. As an example, assume a train with the constants described above - 15. 6 cycles/MPH. If the overspeed detection point is 30 MPH, the fre­quency at which overspeed is detected is 30 x 15. 6 or 468 cycles. If the wheel diameter wears to 34 inches, the new constant is 16. 5 cycles/MPH and the over­speed point would now become 468 divided by 16. 5 or 28. 4 MPH. If it is desired to compensate for the wheel wear, the overspeed must be set to operate at 16. 5

U-5824, p. 12

J: 0..

~ "-v, LU ..... u >-u z >-u z LU ::::, CJ LU 0:: u.

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32 l/ v / ,,v

30 v /1 A' .% .Y

28" /30" v 32''./ 34,Y 36':,.,0 38":,

28

26

D (WHEEL DIA.) v v v v / ~ .. v / v v ., v .... v v v v / , ..... I/ 4?.>'

- r-

_ 5.6 IN .... / /

F/MPH - -D- / / ,,,,, / / / ,,v .... v,j4.:.:.,

24 I v v /"" i/ / .,v ./ ... / v

/ _)' / / ,

./ / / .. ,,, ...... / ., _.,

22 I v I/ ,,V / / /

... / / / _,,

v / v ,,,, / ,,,v / v ./ _.,

20 ' / /

... v / .... v / _.,v / ... v .,

/ / v v , / v v / / /

18 v / .,v / I/ ,.,",, / / __.,.,

v / /, / / I./ / _.,/ /

16. v v / I' / / ./ / /.,. / ,,

v / :/ I/ / / .,,,,. ., / / _., ...

14 v v v v I/ I/ v ./ /"

v v v v. v ~ ~ ~ / 12

v v v v .... ...._.,., ~ [...-". /'

V, v ~ ~ ~ V, ~ .....

10 /. / ,_.,., /. ~ ':""' ......... v. v/ :;..; ~ % ~

8 ~ ~ ~ '.% ~ "/

h th ~ ~ ~

6

4

l.;,:: ~ ~ ~ v

~~~ 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200

NUMBER OF TEETH ON Mil GEAR

Figure 3

x 30 or 495 cycles. To accomplish the adjustment, connect an audio oscillator in parallel with the magnetic pick-up at the main terminal board. Set the oscillator at 495 cycles at an amplitude of approximately 2V rms. Connect a temporary jumper lead at the main terminal board to bridge the appropriate cab signal relay contact and adjust the potentiometer to drop out the OSR relay. In a similar man­ner, the other speeds may be adjusted.

U-5824, p. 13/14

PARTS LIST FOR STYLE SS-I OVERSPEED DETECTOR

PC BOARDS

ORDER BY PIECE NUMBER & DESCRIPTION SHOWN IN BOLD TYPE

Item No. Description

UN451043-1402 Fail Safe Level Detector

Board, printed circuit

Cl Capacitor, 2 mfd. C2 Capacitor, 100 mfd. C3 Capacitor, 220 mfd. C4 Capacitor, .15 mfd. C5 Capacitor, . 15 mfd. C6 Capacitor, 2 mfd. C7 Capacitor, 100 mfd. cs Capacitor, . I mfd. C9 Capacitor, . 01 mfd. CIO Capacitor, 0. 5 mfd. Cll Capacitor, 0. 5 mfd. Cl2 Capacitor, 33 mfd. Cl3 Capacitor, 33 mfd.

Dl Diode D2 Diode D3 Diode D4 Diode D5 Diode D6 Diode D7 Diode DS Diode

Ql Transistor Q2 Transistor Q3 Transistor

WESTINGHOUSE AIR BRAKE COMPANY SIGNAL & COMMUNICATIONS DIVISION Swissvale Post Office Pittsburgh Pa 15218

Piece No.

UM451043-1401

UJ706399 UJ706416 UJ706392 UJ706685 UJ706685 UJ706399 UJ700547 UJ706664 UJ706439 UJ706ll9 UJ706ll9 UJ706159 UJ706159

UJ723555 UJ723555 UJ723742 UJ723742 UJ723555 UJ723555 UJ723555 UJ723555

UJ731281 UJ731186 UJ731288

Used On

U-5824, p. 15

WABCO ~~

ORDER BY PIECE NUMBER & DESCRIPTION SHOWN IN BOLD TYPE

Item No. Description

Q4 Transistor Q5 Transistor Q6 Transistor Q7 Transistor QS Transistor Q9 Transistor QlO Transistor

I Qll Transistor

Rl Resistor, 75K R2 Resistor, lOOK R3 Resistor, 330 ohm R4 Resistor, 1. 5K R5 Resistor, 3. 9K R6 Resistor, 39K R7 Resistor, 39K RS Resistor, 3.9K R9 Resistor, 3.6K RlO Resistor, 180K Rll Resistor, 47K Rl2 Resistor, llK Rl3 Resistor, 4. 3K Rl5 Resistor, lOK Rl6 Resistor, 470 ohm Rl7 Resistor, 68K Rl8 Resistor, 7.5K Rl9 Resistor, 150K R20 Resistor, 820 ohm R21 Resistor, 1. 6K R22 Resistor, 15K

UN451043-1502 Voltage Regulator

Board, printed circuit

Cl Capacitor, 100 mfd. C2 Capacitor, 2 mfd. C3 Capacitor, 3000 pf. C4 Capacitor, 100 mfd.

Dl Diode D2 Diode D3 Diode D4 Diode

Ll Choke, 300 Mh

U-5824, p. 16

Piece Used No. On

UJ731288 UJ731281 UJ731281 UJ731281 UJ731186 UJ731281 UJ731282

I UJ731186

UJ721154 UJ720838 UJ721385 UJ721064 UJ720764 UJ720765 UJ720765 UJ720764 UJ721191 UJ735134 UJ720846 UJ721258 UJ723005 UJ720883 UJ721065 UJ720850 UJ721257 UJ720840 UJ720774 UJ721254 UJ720885

UM451043-1501

UJ706857 UJ706815 UJ706001 UJ706182

UJ723962 UJ723742 UJ723861 UJ723731

UJ706790

WESTINGHOUSE AIR BRAKE COMPANY SIGNAL & COMMUNICATIONS DIVISION Swissvale Post Office Pittsburgh Pa 15218

I

ORDER BY PIECE NUMBER & DESCRIPTION SHOWN IN BOLD TYPE

Item No. Description

Ql Transistor Q2 Transistor Q3 Transistor Q4 Transistor

Rl Resistor, 2K R2 Resistor, 680 ohm, 2W R3 Resistor, 150 ohm, 2W R4 Resistor, 150 ohm, 2W R5 Resistor, lK, lW R6 Resistor, 510 ohm R7 Resistor, to be determined

UN451043-0904 Thru -0909

A Speed Filter

B Speed Filter

c Speed Filter

D Speed Filter

E Speed Filter

F Speed Filter

Board, printed circuit

Cl Capacitor, . 047 mfd. C2 Capacitor, . 047 mfd. C3 Capacitor, . 047 mfd. C4 Capacitor, . 047 mfd. C5 Capacitor, 2 mfd. C6 Capacitor, . 047 mfd. C7 Capacitor, . 047 mfd. C8 Capacitor, . 047 mfd. C9 Capacitor, . 047 mfd. ClO Capacitor, 2 mfd.

QI Transistor Q2 Transistor Q3 Transistor Q4 Transistor Q5 Transistor Q6 Transistor Q7 Transistor

WESTINGHOUSE AIR BRAKE COMPANY SIGNAL & COMMUNICATIONS DIVISION Swissvale Post Office Pittsburgh Pa 15218

Speed Filters

Piece No.

UJ731291 UJ731186 UJ731263 UJ731230

UJ721080 UJ720815 UJ721587 UJ721587 UJ720851 UJ721081

UN451043-0904

UN451043-0905

UN451043-0906

UN451043-0907

UN451043-0908

UN451043-0909

UN451043-0901

UJ706762 UJ706762 UJ706762 UJ706762 UJ706399 UJ706762 UJ706762 UJ706762 UJ706762 UJ706399

UJ731281 UJ731281 UJ731281 UJ731281 UJ731281 UJ731281 UJ731281

WABCO ~~

Used On

All

All All All All All

A thru E A thru E A thru E A thru E A thru E

All All All All All

A thru E A thru E

U-5824, p. 17

I

WABCO ~~~

ORDER BY PIECE NUMBER & DESCRIPTION SHOWN IN BOLD TYPE

Item No. Description

QS Transistor Q9 Transistor QlO Transistor

Rl Resistor, 300 ohm R2 Resistor, 300 ohm R3 I Resistor, 300 ohm R4 Resistor, 300 ohm R5 Resistor, 300 ohm R6 Resistor, 300 ohm R7 Resistor, 300 ohm RS Resistor, 300 ohm R9 Resistor, 20K RlO Resistor, 20K Rll Resistor, 20K Rl2 Resistor, 20K Rl3 Resistor, 56K Rl4 Resistor, l2K Rl5 Resistor, 2K Rl6 Potentiometer, lK Rl7 Resistor, 7. 5K

Rl8, Rl9, Resistor, l3K R20, R21 Resistor, 3. 48K

Resistor, l lK Resistor, 3. 09K Resistor, 6810 ohms

R22 Resistor, 20K R23 Resistor, 20K R24 Resistor, 20K R25 Resistor, 20K R26 Resistor, 56K R27 Resistor, 12K R28 Resistor, 2K R29 Potentiometer, lK R30 Resistor, 7. 5K

R3l, R32 Resistor, 19. 6K R33, R34 Resistor, 6. 34K

Resistor, 16. 9K Resistor, 5. 76K Resistor, l4K Resistor, 23. 2K

U-5824, p. 18

Piece Used No. On

UJ731281 A thru E UJ73128l A thru E UJ73128l A thru E

UJ721251 All UJ72125l All UJ721251 All UJ721251

I All

I UJ721251 A thru E UJ72125l A thru E UJ721251 A thru E UJ72125l A thru E UJ7212ll All UJ7212ll All UJ7212ll All UJ7212ll All UJ720848 All UJ72082l All UJ721080 All UJ620719 All UJ721257 All UJ735325 A UJ735323 B UJ735100 c UJ735371 D UJ735082 E UJ7212ll A thru E UJ7212ll A thru E UJ7212ll A thru E UJ7212ll A thru E UJ720848 A thru E UJ720821 A thru E UJ721080 A thru E UJ620719 A thru E UJ721257 A thru E UJ735324 A UJ735084 B UJ735076 c UJ735088 D UJ735ll6 E UJ735387 F

WESTINGHOUSE AIR BRAKE COMPANY SIGNAL & COMMUNICATIONS DIVISION Swissvale Post Office. Pittsburgh. Pa 15218

ORDER BY PIECE NUMBER & DESCRIPTION SHOWN IN BOLD TYPE

Item No. Description

UN451043-4301 Zero Velocity and Shaper Limiter

Cl Capacitor, .47 mfd. C2 Capacitor, . 022 mfd. C3 Capacitor, l mfd. C4 Capacitor, • 047 mfd. C5 Capacitor, 100 mfd. C6 Capacitor, • 22 mfd. C7 Capacitor, • 0047 mfd. cs Capacitor, • 0047 mfd. C9 Capacitor, . l mfd. ClO Capacitor, . 068 mfd.

Dl Diode, Zener D2 Diode, Zener D3 thru Diode D6 incl.

D7 Diode D8 Diode D9 Diode DlO thru Diode Dl3 incl.

Ql Transistor Q2 Transistor Q3 Transistor Q4 thru Transistor Ql3 incl.

Ql4 Transistor

Rl Resistor, lOK R2 Resistor, lOK R3 Resistor, 2K R4 Resistor, 39K R5 Resistor, 20K R6 Resistor, lK RS Resistor, lOOK R9 Resistor, 51K RlO Resistor, lOOK Rll Resistor, lOOK Rl2 Resistor, 20K Rl3 Resistor, lOK Rl4 Resistor, 240 ohm Rl5 Resistor, 4. 7K Rl6 Resistor, 2.2K Rl7 Resistor, 2.2K Rl8 Resistor, 2.2K Rl9 Resistor, 22K R20 Resistor, 12K R21 Resistor, lOK

WESTINGHOUSE AIR BRAKE COMPANY SIGNAL & COMMUNICATIONS DIVISION Swissvale Post Office. Pittsburgh Pa 15218

Piece No.

UJ709055 UJ706564 UJ706813 UJ706762 UJ706182 UJ706858 UJ709068 UJ709068 UJ706436 UJ706814

UJ726028 UJ726028 UJ723555

UJ723742 UJ723742 UJ726096 UJ723555

UJ731280 UJ731281 UJ731288 UJ731281

UJ731186

UJ720883 UJ720883 UJ721080 UJ720765 UJ7212ll UJ720882 UJ720838 UJ721213 UJ720838 UJ720838 UJ7212ll UJ720883 UJ73733 UJ720892 UJ720842 UJ723434 UJ723434 UJ720843 UJ720821 UJ720883

WABCO

Used On

U-5824, p. 19

WABCO ~

Item No.

R22 R23 R24 R25 R26 R27 R28

I R29 R30 R31 R32 R34

Cl C2 C3 C4 C5 C6 C7 cs C9

DI D2

QI Q2 Q3 Q4 Q5 Q6 Q7

RI R2 R3 R4 R5 R6 R7

U-5824, p. 20

ORDER BY PIECE NUMBER & DESCRIPTION SHOWN IN BOLD TYPE

Description

Resistor, 12K Resistor, 22K Resistor, 2.2K Resistor, lOK Resistor, 2.2K Resistor, 300 ohm Resistor, lOK Resistor, 5. IK Resistor, IOK Resistor, 200 ohm Resistor, 3. 3K Resistor, lOK

UN451043-ll02 Vital "AND Gate"

Board, printed circuit

Capacitor, . 001 mfd. Capacitor, . 01 mfd. Capacitor, . 022 mfd. Capacitor, • 047 mfd. Capacitor, • 22 mfd. Capacitor, 10 mfd. Capacitor, 100 mfd. Capacitor, 10 mfd. Capacitor, 100 mfd.

Diode Diode

Transistor Transistor Transistor Transistor Transistor Transistor Transistor

Resistor, IOK Resistor, 220 ohm Resistor, 110 ohm Resistor, 27K Resistor, 4. 7K Resistor, 2K Resistor, IK

Piece Used No. On

UJ720821 UJ720843 UJ723434 UJ720883 UJ720842 UJ721236

I UJ720883

I I UJ72ll 79 UJ720883 UJ720786 UJ720888 UJ720883

UM451043-1101

UJ701823 UJ701821 UJ706691 UJ706655 UJ706601 UJ706625 UJ706819 UJ706625 UJ700532

UJ723555 UJ723555

UJ731288 UJ731288 UJ731288 UJ731281 UJ731186 UJ731291 UJ731281

UJ720883 UJ720887 UJ723224 UJ720759 UJ720892 UJ721080 UJ720882

WESTINGHOUSE AIR BRAKE COMPANY SIGNAL & COMMUNICATIONS DIVISION Swissvale Post Office Pittsburgh Pa t52t8

ORDER BY PIECE NUMBER & DESCRIPTION SHOWN IN BOLD TYPE

Item No.

RS Resistor, 3. 3K R9 Resistor, 15K RIO Resistor, 30K Rll Resistor, 470 ohm Rl2 Resistor, 680 ohm Rl3 Resistor, l.2K

WESTINGHOUSE AIR BRAKE COMPANY SIGNAL & COMMUNICATIONS DIVISION Swissvale Post Office Pittsburgh Pa 15218

Piece Description No.

UJ720888 UJ720885 UJ721260 UJ721065 UJ720773 UJ720820

WABCO ~

Used On

U-5824, p. 21