UNION SWITCH

&

SIGNAL INC.

A member ol thef

ANSALOOj G;oup

5800 CORPORA TE DRIVE

PITTSBURGH, PA 15237

/

SERVICE MANUAL 6051

AF0-11 B

AND

AF0-11 BT

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

AUDIO FREQUENCY OVERLAY EQUIPMENT

INSTALLATION, APPLICATION AND MAINTENANCE

April, 1979

C-7/89-5-2112·3

COPYRIGHT 1989, UNION SWITCH & SIGNAL INC.

PRINTED IN USA

TABLE OF CONTENTS

Section

I

INTRODUCTION

II

A. PURPOSE

DESCRIPTION AND OPERATION

A. GENERAL

1. Track Circuit Operation

2. Equipment

B. AFO-IIB RECEIVER

III

1. Amplifier Demodulator Board

2. Relay Driver Board

C. RECEIVER RELAY

D. AFO-IIB and AFO-IIBT Transmitter

1. Carrier Modulator Board

2. Transmitter Driver Board

3. Transfer Board

E. TRANSFER RELAY (AFO-IIBT ONLY)

F. AFO-IIB AUXILIARY EQUIPMENT

1. Track Coupling Units

2. Blocking Reactor

APPLICATION INFORMATION

A. FREQUENCY SELECTION

B. RECEIVER RELAY

C. TRACK COUPLING UNITS

D. BLOCKING REACTOR

E. TRACK LEADS AND POWER SUPPLY

F. LIGHTNING PROTECTION

1. Track Terminal Protection

2. Battery Line Protection

G. SURGE-RIPPLE FILTERS

H. AFO-IIBT

Page

1-1/2

1-1/2

2-J.

2-1

2-1

2-3

2-3

2-3

2-5

2-6

2-6

2-6

2-6

2-7

2-9/10

2-9/10

2-9/10

2-9/10

3-1

3-1

3-4

3-6

3-11

3-14

3-14

3-15

3-16

3-17/18

3-17/18 i

::

SECTION I

INTRODUCTION

A. PURPOSE

The purpose of this manual is to outline the J?r.i.nciples of

Audio Frequency Overlay (AFO-IIB) track circuits and to provide information to assist the user in applying AFO-IIB equipment.

This information is essential for planning AFO-IIB installations, and includes track circuit data necessary for laying out track circuits, along with frequency allocation rules which are necessary to provide optimum efficiency and safety of operation.

The AFO-IIB electronic circuits have been designed in accordance with the Failsafe principles as set forth by the A.A.R.

(Association of American Railroads). These circuits perform the vital train detection which does not require insulated rail-joints, and can be used for highway crossing application or as continuous train detection in signal systems.

The AFO-IIB Transmitters are available in both high and low power models to allow a flexible range of train uetection.

The transmitter's signal is pulse-modulated to provide a high degree of immunity to noise in the rails.

All AFO-IIB Transmitters and Receivers are completely transistorized and operate from a DC power supply ranging from 8.8 to 16.2 volts.

WABCO AFO-IIB Transmitters, Receivers, and Track Coupling Units use the same size and· style case (only the internal circuitry differs). The case is constructed of sheet steel.

The AFO-IIBT transmitters provide the automatic transfer feature.

6051, p. 1-1/2

SECTION II

DESCRIPTION AND OPERATION

A. GENERAL

Audio frequency overlay (AFO) equipment was created in order to fill the need for vital train detection: (a) in addition to provisions already present in a signaling system, and {b) with detection which does not require insulated rail joints.

AFO-IIB equipment is designed to satisfy the above conditions using standard signaling power (8.8 to 16.2 VDC actual) and equipment.

The term "audio frequency" has been applied to this type of equipment because i t makes use of frequencies within the audio range (20-20,000 Hz). The term "overlay" is applied to its name because the APO signal is superimposed or overlaid on the existing track circuit.

1. Track Circuit Operation

An AFO track circuit is composed of a transmitter, receiver, and receiver relay. The transmitter and receiver require a DC power source for operation.

The transmitter introduces an audio signal of a specific assigned frequency into the track through two wires that are connected directly to the rails. The point at which the wires are connected defines one end of the AFO track circuit.

The receiver only responds to a specific assigned frequency. The receiver is also connected to the rails with.two wires and.this point defines the other end of the AFO track circuit. Upon receiving the proper frequency, the receiver detects, amplifies, and rectifies the signal to provide an output to operate an external relay.

The contacts of the relay are then employed in the same fashion as conventional track relay contacts.

The APO track circuit detects the presence of a train through loss of the audio frequency signal which is shunted by the train wheels. This is depicted in Figure 2-1.

A series of AFO-IIB track circuits, as shown in Section III, can be superimposed on a track section. Each track circuit will operate independently without interference from the operation of other AFO-IIB or DC track circuits. This is particularly important where adjacent highway crossings have overlapping approach limits. Also, i t allows an overlap at the crossing for an island circuit,as shown in Figure 2-2.

6051, p. 2-1

UNOCCUPIED TRACK CIRCUIT OCCUPIED TRACK CIRCUIT

~,

~

..................

,

..

,

.................. u

..-ct'\:.OcPcA,•••

ENERGIZED

AFO SIGNAL

SHUNTED

RECEIVER

DC POWER

SOURCE RELAY

I

~

CCIRCUITS

Nd

DEEN ERG I ZED

Figure 2-1. Typical AFO-IIB Track Circuit Operation

1 Track Signal

• Transmitter

#1

2 Track Signal

I·

Transmitter #2 FreguenvY

Freguenc"I

J

L

1 TRACK 2 TRACK

AFO-IIB

TRANSMITTER

'1

AFO-IIB

RECEIVER

'2

TRACK

RELAY

12

(!)

0

""

>-

1

::c

(!)

:i:

AFO..-IIB

~·

TRACK

,,

AFO-IIB

TRANSM1Tr1:R

'2

Figure 2-2. Typical AFO-IIB Highway Crossing Layout With Overlapping Track Circuits

6051, p.

2-2

2. Equipment

All circuitry in the transmitter and receiver is of printed circuit board construction. The P.C. boards are hard wired and enclosed in a sheet steel housing designed for shelf, wall or rack mounting. AAR terminal strips are provided for ciruit connections.

Surge protection is provided within the receiver and transmitter for both the DC line and track lead inputs. See Section

III-F for lightning protection requirements.

Reverse polarity protection is also included. If battery polarity is accidentally reversed, a protective fuse will blow which disconnects the unit from the battery supply. This also helps to prevent the possibility of power loss to other equipment.

B. AFO- I IB RECEIVER

Because highway crossing control circuits are vital, the AFO-IIB

Receiver circuitry has been designed according to the failsafe principles of operation; whereby a failure of a component or a change in the value of a component will reduce the power supplied to the receiver relay. Thus, the relay will not be energized due to a component failure. ·

The receiver will operate over a DC battery voltage range of

8.8 to 16.2 volts. In case of battery failure, the receiver will not be damaged from the battery charger rectifier, nor will the receiver relay be falsely energized.

A sensitivity adjustment is built into the receiver unit to obtain the proper shunting characteristics for each track circuit.

The AFO-IIB Receiver is housed with all circuit components mounted on two printed circuit boards: Amplifier-Demodulator and Relay Driver. Both boards are mounted to the top plate and enclosed within the housing.

1. Amplifier Demodulator Board N451522-03XX {Refer to Figure 2-3)

The signal from the track is applied to a low impedance, series-tuned filter which rejects DC or low frequency

AC voltages present from any existing track circuit.

The filtered AFO signal is then applied to a variable gain input amplifier. The gain is adjusted on installation with the "Relay Volts" potentiometer to establish the track circuit shunting sensitivity. The signal is further amplified and filtered with a high selectivity band-pass filter before being demodulated.

An envelope detector recovers the modulation signal, which is again filtered to pass only the assigned modulation frequency.

6051, p. 2-3

AFO-IIB

TRANSMITTE

I .

rr=--

1

,...._...._ ________

~

LOW Z

I

SERIES

RESONANT

I

I

CIRCUIT

I

I

I

I l

I

I

I

I

MODULATION

FREQUENCY

BANDPASS

FILTER

L - - r t

L -

COMPLEMENTARY

SYMMETRY

POWER

AMPLIFIER

VARIABLE

GAIN INPUT

AMPLIFIER

"RELAY

VOLTS"

AFO RECEIVER

-

HIGH SEL.

BANDPASS

FILTER

-

--,

I

I

ENVELOPE

-·

-

DETECTOR

AMPLIFIER DEMODULATO

_ _ ·-·· _ _

..J

-

-

-

+DC -DC t :

-

-

- -

-

-·

- -

1

I i

RELAY DRIVER BOARD

-DC

BATTERY

LINE

SURGE

FILTER

I

I

I

I

I

I -

.J+Battery

+

'-----------Battery

AFO

TRACK RELAY

400-500£2

PN-lSOBH or

DN-22BH

Figure 2-3. AFO-IIB Receiver Block Diagram

6051, p. 2-4

Critical bias voltages are decoupled from the DC power buss with a special four terminal capacitor to prevent false relay energization from battery ripple, and will open the DC supply in the case of a lead breaking off of the capacitor.

2. Relay Driver Board - N451522-0202 (Refer to Figure 2-3)

The Relay Driver Board contains no frequency selective circuitry and is identical for all AFO-IIB Receivers.

Output from the Amplifier - Demodulator Board is applied to a complementary symmetry power amplifier to provide sufficient power to operate a 400 or

500 ohm vital relay. The amplifier output is transformer coupled to a full wave bridge rectifier which converts the AC signal to a DC voltage appropriate to the class of relays mentioned.

Also included on the Relay Driver Board is a batterv line surge filter to protect the solid state circuitry against voltage spikes such as might be caused by relays or motors on the same battery line.

TABLE 2-1. AFO-IIB RECEIVER CHARACTERISTICS

Input Voltage

Input Current

Output Voltage ( 400 ohm load)

Signal Sensitivity

Input Impedance (Track)

Output Load

Bandwidth

Operating Frequencies

Temperature Range

Surge Protection

8. 8 - 16. 2 VDC

O.

15 amp. at 12 VDC

6

VDC minimum ( with 5 m V rms input signal and

8. 8 volts battery )

5 millivolts rms minimum detectable signal ( during on-time of modulation cycle)

1 ohm at center of assigned frequency

(nominal)

400 or 500 ohm Relay ( PN150BH or

DN22BH Relay, respectively)

-6 db ~t

±3.

0% of assigned frequency

See Table 3-1

-40°C to +71 °C ( -40°F to+ 160°F)

Built-in

6051, p.

2-5

C. RECEIVER RELAY

The Receiver Relay should be a WABCO DN-22BH (shelf} or a

PN-lSOBH (rack} relay.

See Section III-B for application characteristics.

D. AFO"."'IIB and AFO-IIBT TRANSMITTERS

The AFO-IIB as well as the AFO-IIBT Transmitter have a fixed output. The transmitter will operate on a DC battery voltage range of 8.8 to 16.2 volts. The modulated signal provides noise immunity of the circuit and reduces battery consumption by the transmitter.

The AFO-IIB Transmitter contains two printed circuit boards mounted within the housing: The Carrier-Modulator Board and the Transmitter Driver Board. The AFO-IIBT Transmitter contains besides the above boards, a third board mounted within the housing: The Transfer Board.

Transmitter characteristics are given in Table 2-2. See

Section VII for parts listing.

1. Carrier-Modulator Board - N451522-05XX (Refer to Figure 2-4)

This board accomplishes four functions: generation of the basic carrier frequency, generation of· the modulation rate frequency, summing of the carrier and modulation signals, and voltage amplification.

The fundamental carrier signal is generated at the carrier oscillator and is coupled to a summing circuit. A modulation oscillator generates the modulating signal and is also coupled to the summing circuit where it causes the carrier signal to increase and decrease in amplitude at the modulation rate. Because the signal is at a very low energy level it is coupled first to a Darlington amplifier and then to an emitter follower amplifier for voltage amplification. The signal is now at a sufficient voltage level but lacks the .power required to perform its function, so i t is coupled to the Transmitter Driver

Board.

2. Transmitter Driver Board - N451522-06XX (Refer to Figure 2-4)

The output from the Carrier Modulator Board, since it does not have sufficient power to overcome losses encountered traveling through the rail as well as losses through the ballast to provide sufficient voltage at the receiver, is coupled to the Transmitter Driver Board. The Transmitter

Driver Board provides final power amplification of the modulated carrier signal by coupling the High impedance output of the emitter follower and providing low impedance coupling to the track through a two transistor push pull power amplifier which has at its output a series resonant circuit. The series resonant circuit allows easy passage

6051, p. 2-6

.. of the carrier frequency signal and inhibits passage of any unwanted signals, such as harmonics.

3.

Transfer Board (AFO-IIBT Transmitters Only)--N451522-1402

(Refer to Figure 2-5)

This board monitors the center tapped primary of the output transformer to compare its level with a factory predetermined calibration level. The normally sufficient modulation carrier

·signal is fed into the two-channel input of the transfer board, rectified, and "AND" gated into a Schmitt trigger. The output of the trigger circuit is amplified and drives the transfer relay which will be energized when the output of the primary AFO-IIBT exceeds the calibration level and connects the unit to the track through the front contacts of the relay. An insufficient output level of either half of the center tapped primary output transformer causes deenergization of the relay, and transfers the output from the primary AFO-IIBT unit to the stand-by AFO-IIB unit by means of the back contacts of the relay. Both polarities of the

DC power supply are also switched by the transfer.

The system will continue to operate in the stand-by mode until the malfunctioning primary AFO-IIBT transmitter is repaired.

TABLE 2-2. AFO-IIB TRANSMITTER CHARACTERISTICS

AFO-IIB

AFO-IIBT

Input Voltage a.a -

16.2 VDC Same

Input Current:

Output ( 2n Load)

Output Voltage

(2Q load, 12. OV battery)

0.28 Amp.

@

12V input

4.2V P-P during period of mod.

"ON

II

.30 Amp@ 12V input

Same

1 ohm Same Output Impedance

(Norn. at center of assigned Freq.)

Operating Freq.) See Table 3-1 Same

Temperature Range Same

Surge Protection

Min. Ballast

Resistance

-40°C to +71°C

(-40°F to 160°F)

Built-In

3 ohm/1000 Ft.

Same

Same

6051, p. 2-7

AFO

RECEIVER

T

I \

-

I

I

I

I

I

I

I

I

I r - - - - - - - - - - - - -

- - - - ,

!

I

I

I

I

: r------,

I

I !

I

SERIES

RESONANT

CIRCUIT

PUSH-PULL

I l

Transfer j

To t-----,--:

M Board ~Transfer

T

I

Relay

I

AMPLIFIER

I

I

TRANSMITTER DRIVER

BOARD

/ \

L - - - - - - - - - - - - r -

1

-

I I

I L _ _ _ _ _

I

.J

I

_J

Used

On

AFO-IIBT

Only

--------------------,

I

EMITTER

FOLLOWER

AMPLIFIER

I

I

I

I \

I

I

I

I

DARLINGTON

AMPLIFIER

I

I

I

1·

,

\

I

I

I

CARRIER

OSCILLATOR

SUMMING

CIRCUIT

MODULATION

RATE

OSCILLATOR

I

I

I

I

I

.

I

I

I

: CARRIER MODULATOR BOARD

I

L -- -

..J

6051, p. 2-8

Figure 2-4.

AFO TRA.~SMITTER

AFO-IIB and

AFO-IIBT

Transmitter Block Diagram

E. TRANSFER RELAY - AFO-IIBT

The Transfer Relay should be a WABCO DN-11 -400 ohm.

It is connected to the AFO-IIBT as shown in Figure

2-5.

F. AFO-IIB AUXILIARY EQUIPMENT

1. Track Coupling Units

A coupling unit is used when the AFO signal must be passed around insulated joints, and the existing track circuit energy must be blocked. This unit uses transformer coupling to pass the AFO signal to the next track section.

Redundant blocking of DC passage is accomplished in the track coupling unit by both the transformer and the series components to provide vitality of the system. (See

Section IV, Figure 4-3 for details).

Two coupling units are available: one for each class of AFO-IIB frequencies. Since each unit has tuned taps for each frequency in its class, one unit is required for each frequency to be passed around the insulated joints.

The frequency-determining taps are located inside the unit and must be connected to the proper taps as determined by the selected operating frequency.

The Track Coupling Unit has the same dimensions and utilizes the same housing, for shelf/wall or rack mounting, as the receiver and transmitter.

Table

7-1,

Section VII, contains part number references for the Track Coupling Units. Figure 4-3 (contained in Section IV) shows typical wiring arrangements for

Track Coupling Units.

2. Blocking Reactor

The purpose of the Blocking Reactor is to block the

AFO signal while passing DC and low frequency AC.

A reactor recommended for this application is blocking reactor, N451036-0302, which has a DC resistance of

0.01 ohm and a current rating of

7 amperes. This reactor may be mounted on a relay rack in a PN-250 space or on a wall or shelf. Dimensions are 8" x

5

11 mounting plate with a depth of 3-5/8".

See "Blocking Reactor" Section III-D for various applications to AFO-IIB track circuits.

6051, p. 2-9

°'

Ul

...

.....

"O

.

N

I

.....

0

AFO-Il BT PRIMARY UNIT

. . - -...... OTHER CIRCUITRY

- -TIU\NsFERBOAOD i

I

DN-11

AND

I

GATE ~ A M ~

I s

_(DC~\-1

I ~

I ~

L - -

I

----------..J

OTHER CIRCUITRY

3 4

J 4

AFO-IIB

STAND-BY UNIT l

B+

2

Figure 2-5. Transfer Unit Schematic Diagram and System Interface

SECTION III

APPLICATION INFORMATION

A. FREQUENCY SELECTION

The AFO-IIB system provides transmitter and receiver units

.in sixteen different frequencies shown in Table 3-1, and

·divided into two groups of eight each:

These two· ·gl!'oups of freque·ncies are defined as Class 1 and

_Class 2. · Corresponding frequencies in each class use the same modulation rate.

Class 1 frequencies are intended for use in single track areas and for the first track of a double track area. class 2 frequencies are used on the second track of a double track area. .

If more than two parallel tracks are involved, the frequency classes must be alternated with respect to adjacent tracks to reduce the possibility of inductance coupling between parallel tracks.

AFO-IIB frequencies have been computer selected within each

Class to:

1. Obtain optimum separation from the sum and difference frequencies of assigned AFO-IIB frequencies.

2. Avoid h-armonics up to the fifth harmonic of AFO-IIB frequencies.

3. Minimize harmonic mixing and the mixing of harmonics with the assigned AFO-IIB frequencies.

4. Obtain uptimum separation from the 60 cycle power frequency and'its harmonics and the mixing of these with .AFO~IIB frequencies.

COMPATIBILITY WITH MOTION MONITOR

Table 3-2 shows the frequency compatibility between the

AFO-IIB and Motion Monitor. Frequency allocation must be made in accordance with this table.

6051, p. 3-1

TABLE 3-1. AFO-IIB FREQUENCIES

FREQUENCY

DESIGNATION

CLASS 1

FREQUENCY

CLASS 2

FREQUENCY

MODULATION

RATE

Fl·

F2

F3

F4

F5

F6

885 Hz

1050 Hz

1330 Hz

1860 Hz

2540 Hz

3360 Hz

930 Hz

1120 Hz

1420 Hz

2140 Hz

2720 Hz

3410 Hz

18 Hz

22 Hz

27 Hz

39 Hz

49 Hz

68 Hz

NOTE: The two

AFO-ll track coupling wlits are tuned only for those frequencies shown above and cannot be used with frequencies shown below.

F7

F8

4565

Hz

6180 Hz

5090 Hz

6330 Hz

94 Hz

139 Hz

TABLE 3-2. FREQUENCY ALLOCATION FOR WABCO VITAL AFO-II EQUIPMENT

AFO-II Frequency

930 and

3410

1050 and 3360

885 and 1860

1330 and 3360

1050 and 2540

1120 and 2720

2140 and 1420

930 and 3410

Hz

Hz

Hz

Hz

Hz

Hz

Hz

Hz

Motion Monitor Frequency

207

230

390 and 570

390 and 570

390 and 570

405 and 630

405 and 630

405 and 630

Hz

Hz

Hz

Hz

Hz

Hz

Hz

Hz

6051, p. 3-2

Fr~quencie~ n~t comp~tible with the AFO-IIB track coupling units, as indicated in Table 3-1, must be applied in a track section where it is not necessary to bypass an insulated joint.

Certain basic rules, listed under "Applidation Rules", must be followed in the application of AFO-IIB track circuit equipment to ensure maximum effectiveness and security.

APPLICATION RULES

1. Do not repeat the same frequency on the same track unless the track circuits are separated by two pairs of insulated joints. a) If a coupling unit is used to bypass a set of insulated joints, these joints may not be counted in applying Rule 1 above.

2. Do not mix frequencies from both classes on orie track. However, after exhausting the frequencies of one class, the other class may be used on the same track when one pair of insulated joints separates the two classes.

3. The same AFO-II frequency must not be located adjacent on parallel tracks.Frequencies must be staggered.

4. Select frequencies for track circuits on the same track in the following orders.

Class 1: Fl, F4, F6, F3, F5, F2, F7, F8

Class 2: F2, F5, F3, F4, F6, Fl, F8, F7

Frequencies F7 and FB may be used at random with other frequencies within their class. Adjacent track circuits, on adjacent parallel tracks, should be assigned from different classes and be paired as shown above and in Figure 3-1. For example:

F6 of Class 1 would be next to F3 of Class 2.

5. When more than one highway crossing is involved in an AFO layout, a ripple-free power supply must be provided for the transmitters. Surge-Ripple Filters

N451036-0701 for low power, and N451036-0702 for· high power, are available for insertion between the transmitter and the power supply. See Paragraph

"E" "Track Leads and Power Supply."

6051, p. 3-3

MULTIPLE HIG.HWAY

CROSSINGS

',

,,

''

"TRACK NO. l

CLASS l FREQ.

TRACK NO. 2

CLASS 2 FREQ.

T-Fl

-

-

T-F2

-

-

T

R

F

T-F-4 T·F6 R-F3 R-F6

R-F2 R-F5

R-F-4 R-Fl

-

-

T-F3 T-F5

-

-

-

-

-

-

-

-

R-F5 R-F2 T-FS T-F3 R-F4 R-F3

R-Fl R-F6

-

-

-

-

-

-

T-F4 T-F6

-

-

-

-

.....

'

=

AFO-IIB Transmitter

=

AFO-IIB Receiver

=

Frequency Designation (Per Table 3)

.

..

T-F2

-

-

T-Fl

-

-

Figure 3-1. Typical Track Circuit Frequency Layout For

Parallel Tracks

In selecting and applying the frequencies, the required length of the track circuit must also be considered, since the AFO signal attenuation in the track circuit is directly proportional to the frequency.

Figure 3-2, a block length versus frequency curve, shows the maximum effective block length permitted for the AFO-IIB equipment.

NOTE

For each coupling unit used in an AFO-IIB track circuit, the effective length of that track circuit is reduced by 500 feet.

Figure 3-2 represents the maximum lengths for adjusting the track circuit at 20 ohms ballast resistance and does not consider the increase in receding ringing distance resulting from a drop in ballast·resistance. The use of this chart in conjunction with Figures 3-3, 3-4, 3-5 and 3-6 is recommended.

After selecting the frequencies, the receivers _and transmitters may be ordered from Table

7-1 in Section

VII".

B. RECEIVER RELAY

In order to utilize the optimum shunting characteristics of the AFO-IIB equipment, the use of the WABCO DN-22BH or PN-

150BH relay is recommended. These relays have a high releaseto-working voltage ratio which results in closer tolerance between the shunting and pick-up values of the track circuit.

6051, p.

3-4

6500

6000

5500

5000

N

.µ

)-1

Q)

::c:

4500

s::

4000

H

O'I s::

·~

.µ

111 l-1

Q)

0..

0

~

l')

i::

Q)

::s

O"

Q)

)-1

µ,.

3500

3000

2500

2,000

1500

'

\

Maximum track ci rcuit length to obtain SmV at the receiver with 0.060 shunt and 20Q per

1000 feet ballas t.

88.S

'

\

\

\

\

~

\

[\.._

,......._

1000

\

2

'

•

TRACK CIRCUIT LUIGTH IN THOUSAND FUT

Figure 3-2. Maximum Block Length

6051, p. 3-5

This feature is especially significant when considering the

"receding ringing" distance, the distance by which a train must be beyond the receiver track connection (when leaving the

AFO track circuit) in order for the Receiver Relay to pick up.

This distance should be as short as possible for the best utilization of the track circuit.

Other 400 to 500 ohm relays can be used with AFO-IIB, but longer "receding ringing" disti;inces will result. See Figures

3-3 through 3-6, and compare the "Receding Ringing Uistance in Feet" versus "Track Circuit Length" for the effect that ballast resistance and the type of relay have on the "receding ringing" distance. Also, compare the difference in "receding ringing" distance for each frequency - 885Hz, 1050Hz, 1860Hz, and 3410Hz.

Each set of curves is based on:

1. Setting the receiver sensitivity with INFINITE BALLAST

RESISTANCE using an 0.06 OHM RESISTIVE TRACK SHUNT at the receiver connections.

2. Checking the "receding ringing" distance with a ZERO OHM

SHUNT at the BALLAST RESISTANCE INDICATED on the curve.

These parameters are valid since (a) the AFO circuit must always be adjusted with an 0.06 ohm shunt at the best obtainable ballast condition and (b) the actual ballast resistance will be changing randomly with variations in weather conditions.

The curves indicate the following:

1.

Lower frequencies inherently have a longer "receding ringing" distance than the higher frequencies.

2. Optimum ballast condition will result in the shortest

"receding ringing" distance for the frequency and length of track circuit.

3. The type of relay used with the receiver is an important factor affecting "receding ringing" distance.

C. TRACK COUPLING UNITS

The AFO-IIB Track Coupling Unit is used for passing the AFO signal around a pair of insulated rail joints, while blocking

DC or other frequency AC used on the same track section. There are two track coupling units to readily pass any one of the six frequencies in the class for which it is tuned and connected, and reject all other frequencies. See Table 3-1 for classes of frequencies.

6051, p. 3-6

150

.... w w

...

~

UJ z

....

11'1

0

C> z a z ii

C> z

0

UJ u

~

100

50

FREQUENCY 885 Hz

I .

CURVE A - STYLE PN-1508H RELAY

CURVE 8 - STYLE DN-11, 4 POINT

CURVE C - STYLE PN-1508

A

MINIMUM

BALLAST IN

OHMS PER

THOUSAND

FEET

3 ohms

5 ohms

10 ohms

20 ohms

0 2

3

TRACK CIRCUIT LENGTH IN THOUSAND FEET

4

Figure 3-3. 885 Hz Receding Ringing Distances

6051, p. 3-7

150

(.!) z

0

UI

u w

"'

..... w

.... z w z

.,..

0

(.!) z

(.!) z

100 ii.:

FREQUENCY - I 050 Hz

I

CURVE A STYLE PN-150BH RELAY

CURVE B - STYLE DN-11,

4

POINT

CURVE C - STYLE PN-1508

MINIMUM

BALLAST IN

OHMS

3 ohms

5 ohms

10 ohms

0 2 3

TRACK CIRCUIT LENGTH IN THOUSAND FEET

4

6051, p. 3-8

Figure 3-4.

1050 Hz Receding Ringing Distances

150 w z

,_

v,

0

<., z

<., z a:

0 z

0 w

...

c,:

,_ w w u. z

100

FREQUENCY - 1860 Hz

I

CURVE A - STYLE PN-150BH RELAY

CURVE B - STYLE DN-11,

4

POINT RELAY

CURVE C - STYLE PN-1508 RELAY

3 ohms

MINIMUM

BALLAST IN

OHMS

3 ohms

5 ohms

10 ohms

20 ohms

0

2

3

TRACK CIRCUIT LENGTH IN THOUSAND FEET

4

Figure 3-5.

1860 Hz Receding Ringins Distances

6051, p. 3-9

... u.

.., u z

...

VI

Q t., z z ii t.,

~

.....

..... a:

100

50

I

FREQUENCY - 3410 Hz

I

CURVE A STYLE PN·l SOIH RELAY

CURVE 8 STYLE DN-11, '4 POINT RELAY 3 ohms

CURVE C STYLE PN-150I REL•Y

3 ohms

3ohmi

s

ohm,

0

2

3

TRACK CIRCUIT LENGTH IN THOUSAND FEET

Figure 3-6. 3410 Hz Receding Ringing Distances

6051, p. 3-10

NOTE

Since each unit has tuned internal taps for each frequency in its class, one unit is required for each frequency passed around the insulated joint pair.

Each time an AFO-IIB signal is coupled around insulated joints, the effective length of the AFO track circuit is reduced by 500 feet.

Due to severe restriction of effective track circuit lengths, coupling units cannot be used to bypass the following AFO-II frequencies: 4565, 5090, 6180, 6330 Hz. See Figure 4-3 (Section

IV} for wiring connections and Table 7-1 (Section VII) for

Part No. References.

D. BLOCKING REACTOR

In some applications, to prevent shunting the AFO signal through the battery, a ~locking Reactor must be installed in series with one lead of an existing DC battery rail connection which occurs near an AFO-IIB track circuit.

The purpose of the reactor is to block the AFO signal while passing DC and low frequency AC. See View "A", Figure 3-8.

This is not necessary if an AFO-IIB track circuit occurs near the relay end of an existing DC track circuit. The coils in the relay will provide the necessary impedance to block the AFO signal.

The need for the reactor depends upon the impedance presented by the existing DC equipment, their leads, their distance from the AFO-IIB track circuit, and the AFO-IIB frequency employed. One reactor is effective for all AFO frequencies.

Figure 3-7 shows the relationship between minimum impedance,

AFO-IIB frequency, and distance. For example, if the AFO frequency is 1330 Hz and the distance is 200 feet, a reactor must be installed if the impedance in path A, B, C, and Dis less than 0.7 ohm.

Blocking Reactors may also be used for applications as shown in Views "Bu to

»0

11

,

Figure 3-8.

View "B" - Allows the DC track circuit to be shunted by a switch circuit controller without shunting the AFO signal.

View "C" - Defines the AFO track circuit at a specific point with insulated joints and allows the DC circuit to pass.

View "D" - Keeps the AFO signal out of the fouling circuit at a turnout.

6051, p. 3-11

~

I i

2.0

MINUMUM REQUIRED IMPEDANCE IN OHMS

OF

CIRCUIT A-1-C-O

TO APPROXIMATE EXISTING IMPEDANCE,

ADD RESISTANCE OF A-1- AND C-D •

1.0

TRACK

BATTERY

AFO..... TRACK

---+----1

AFO

TRANSMITTER

OR RECEIVER n

•

885 Hz f2

•

930 Hz f3 • 105> f,4

Hz

• 1120 Hz fS f6

• 1330 Hz

• 1"'20 Hz fl

• 1860 Hz f8

• 21'10

19 • 25'10

Hz

Hz

no •

2120 Hz

F11. • 3360

Hz

. f12 • 3"'10 Hz f13 • ,4565 f1"' • 5090 f15 • 6180 f16 • 6330

Hz

Hz

Hz

Hz

0.5

0

DISTANCE "d" IN FEET

Figure 3-7. Requirements for Blocking Reactor

6051, p. 3-12

600

TRACK

AFO ANO DC -

11~ y:

DC BATTERY j

1

I

REACTOR

2~

VIEW "A"

AFO-IIB

TRANSMITTER

OR

RECEIVER

AFO AND D C -

TRACK

2

VIEW "B"

AFO

AND DC

DC

ONLY

TRACK OR

AFO AND

DC

~~LY TRACK

REACTOR

VIEW "C"

AFO AND DC

AFO

AND DC.

DC ONLY

TRACK

REACTOR

VIEW "D"

Figure 3-8. Applications of Reactor to AFO-IIB Track Circuits

6051, p. 3-13

E. TRACK LEADS AND POWER SUPPLY

Leads from the AFO-IIB units to the track should be arranged to minimize their series inductance. Unsheathed single wires may be used in pairs, provided that they are twisted, or kept together within the same conduit. Metal-sheathed single wires may not be used. Sheathed wire or conduit is not required for AFO-IIB wiring within the wayside housing. A

Transmitter and Receiver Unit of the same frequency should have its owri leads to the track.

The battery charger rectifier leads should be wired directly to the battery and then to the power busses or equipment to prevent the battery from being removed from the circuit due to a broken wire and to ensure a ripple-free power supply.

A resistor should never be placed in the power lead to a transmitter or receiver, since the total power lead resistance should be less than 0.15 ohm for transmitters and 0.5 ohm for receivers. If either of these values is exceeded, or if a signal (or ripple) greater than 0.5 volt peak-to-peak exists on the power leads, a Surge-Ripple Filter must be employed.

The following total lead wire resistances are the maximum permissible for maximum track circuit length and minimum

"receding ringing" distance:

1.

2.

3.

4.

5.

Transmitter to Rails

Receiver to Rails

Receiver to Relay

Battery to Receiver

Battery to Transmitter

0.15

0.15

25.00

0.5

0.15 ohm ohm ohms ohm ohm

F. LIGHTNING PROTECTION

Particular attention must be given to lightning protection during installation.

In order to limit the surge voltages, it is necessary to employ suitable arresters between any points of exposure, best.accomplished using a shunt arrester between the track leads to each unit and the series arresters from each track lead to a common ground bus, connected directly to the housing, signal poles, and all grounds at the location in order to limit the surge voltage between any connections on the equipment or between the equipment and the housing.

NOTE

Ground wires should be short and without sharp bends.

6051, p. 3-14

Each of the series arresters should limit the surge voltage across itself to less ·than 1500 volts (peak) in order to prevent the voltage between any two points from exceeding

3000 volts (peak).

Lightning damage can occur from surges entering the AFO-IIB units either through the track terminals or through the battery terminals. These terminals must be protected as follows:

1. Track Terminal Protection

The track terminals of each AFO-IIB Transmitter and

Receiver should be protected by both series and shunt lightning arresters as shown in Figure 3-9 and the coupling unit as shown in Figure 3-10.

Reference 1 should be a WABCO USGA Arrester with a minimum breakdown rating of 500 peak volts and a maximum rating of 1300 peak volts.

Reference 2 should be a WABCO USGA Arrester with a minimum breakdown rating of 75 peak volts and a maJcimum rating of 200 peak volts.

Ground connections, reference 3, should be made to the common low voltage ground bus system that includes grounds at cases or houses. Make ground connections and jumpers with #6 AWG wire. Messenger wire or metallic sheath of cable, if used, may serve as tie-in between cases or houses.

TRACK

©

AFO-IIB

TRANSMITTER

AFO-IIB

RECEIVER

(j)

N451552-0302, USGA ARRESTER (WITH TERM. BLOCK)

@

N451552-0101, USGA ARRESTER

Q)

GROUND BUS

Figure 3-9. Track Lead Lightning Protection - Transmitters and Receivers

6051, p. 3-15

~TO TRANSMITTER

TO RECEIVER

~

CD

z

COUPLING UNIT

3

3

1'1451552-0302 USGA ARRESTEP. WITH TERM. BLOCK

N451552-0101 USGA ARRESTER

GROUND BUS

Figure 3-10. Track Lead Lightning Protection - Coupling

Units and Connections

. 2. Battery Line Protection

The AFO-IIB Transmitters and Receivers, although they have built-in surge suppression, will require additional protection across the power supply. This is accomplished by using the USGA Shunt Arrester, reference 2, across the power leads to the AFO-IIB equipment as illustrated in Figure 3-11.

+

DC POWER BUSS

AFO-B

..:::::@

AFO-N } TO

AFO-IIB UNITS

(2)

N451552-0301, USGA ARRESTER (WITH TEAM BLOCK)

Figure 3-11. Power Supply Lightning Protection

6051, p. 3-16

G. SURGE-RIPPLE FILTERS

Normal operation of AFO-IIB Transmitters and Receivers directly from a rectifier is not recommended since reliability of filter components will decrease.due to excessive ripple.

If the battery supply has a ripple or an AC signal greater than o.sv peak-to-peak, a Surge-Ripple Filter must be used.

If more than one filter is required because of current capacity, all transmitters should be connected to one filter and all receivers to another filter.

A transmitter and receiver of the same frequency should not be connected to the same surge-ripple filter nor should they be connected to the same battery unless a surge-ripple filter is employed to isolate their power leads. This requirement is satisfied by placing a Surge-Ripple Filter in the power leads to either unit, but preferably the receiver. When more than one transmitter/receiver pair is powered from the same source, connecting all the receivers to one filter (up to the filter's current capacity) will satisfy the requirement.

See Table 7-1 in Secti~n VII for.Surge-Ripple filter part numbers.

H. AFO-IIBT

The AFO-IIBT is a transmitter unit which is the same as the

AFO-IIB but contains additional circuitry to operate a transfer relay.

Figure 2-5 and Figure 4-2 shows how the transfer relay, AFO-IIBT, and AFO-IIB units are interwired to provide an automatic transfer feature in the event that the main (AFO-IIBT) transmitter should fail to operate.

6051, p. 3-17/18

SECTION IV

INSTALLATION AND ADJUSTMENTS

All AFO-IIB equipment must be installed in accordance with approved application plans.

Leave DC power for all AFO-IIB equipment disconnected until initial equipment adjustments are to be made as outlined under

"Equipment Adjustments", Paragraph "F".

Connect all wires to the AAR Terminals on top of the unit as follows:

A. AFO-IIB TRANSMITTER (Refer to Figure 4-1)

1. Connect the positive and negative power supply to terminal #1 and #2 respectively. Observe correct polarity. (+DC #1, -DC #2).

2. Connect the track leads to terminals #3 and #4.

B. AFO-IIBT TRANSMITTER (Refer to Figure 4-2)

1. Connect the positive and negative power supply to heel #4 and heel #3 respectively.

2. Connect the Front 3 to Terminal #1 and Front 4 to terminal #2 of the primary unit.

3. Connect the Back 3 to Terminal #1 and the Back 4 to Terminal #2 of the stand-by unit.

4. Connect the track leads to heels #1 and #2.

5. Connect Front 1 and Front 2 to Terminals #4 and #3 of the primary unit respectively.

6. Connect the Back 1 and Back 2 to Terminals #4 and

#3 of the stand-by unit respectively. c.

RECEIVER (Refer to Figure 4-1)

1. Connect the positive and negative power supply to terminals #1 and #2, respectively. Observe correct polarity. (+DC #1, -DC #2).

2. Connect the track leads to terminals #3 and #4.

3. Connect the+ and - relay leads to receiver terminals

#5 and #6, respectively. Observe correct polarity

6051, p. 4-1

O"I

0 u,

...

......

"O

.

.i:,,.

I

N

TRACK

BATTERY POSITIVE

BATTERY NEGATIVE

ARRESTERS

BATTERY POSITIVE

BATTERY NEGATIVE

!-ffRESTERS

AFO-IIB

TRANSMITTER

AFO-IIB

RECEIVER

TRACK RELAY

Figure 4-1. Typical Wire Connections for Transmitter and Receiver

D. TRACK COUPLING UNITS (Refer to Figure 3-10, 4-2, and 4-3)

A Track Coupling Unit is used when the AFO signal must be passed around insulated joints and the existing track circuit energy must be blocked. Figure 4-3 shows how it is used in a track circuit.

The Track Coupling Unit selection, Class 1 or Class 2, is based on the class of the frequency for which it is used.

Total track lead resistance should be kept below 0.15 ohms per pair.

Coupling units should not be used within 100 feet of a receiver or transmitter.

One unit is required for each frequency to be passed around the insulated joints.

Before connecting a coupling unit to the track, do the following to set it for the proper frequency.

1. Remove the unit from the sheet metal cover.

2. Within the housing cover there are four wires on terminal strips which must be properly connected to assign the desired frequency. See Table 4-1 and Figure 4-3.

3. Connect the BLACK and BROWN wires to one of the assigned frequencies as indicated on terminals one to eight.

4. Connect the WHITE and BLUE wires only when one of the first three·frequencies are assigned. When not ass.igned, the slate and blue wires should be connected to the spare terminal 4.

5. Reassemble the unit in its sheet metal cover.

After making the proper internal connections, connect the unit to the track as follows: (See Figure 3-10).

1. Connect track leads from terminals 1 and 2 to the rails on the transmitter side of the insulated joints.

2. Connect track leads from terminals 3 and 4 to the rails on the receiver side of the insulated joints.

6051, p. 4-3

E. BLOCKING REACTOR (Refer to Figure 3-8)

According to application requirements, connect the Blocking

Reactor in series with one side of a circuit or track lead using terminals 1 and 2. See "Blocking Reactor" under

"AFO-IIB Auxiliary Units" and Figure 3-8 for various applications to AFO-IIB track circuits.

F. EQUIPMENT ADJUSTMENTS

After ALL TRACK CIRCUIT EQUIPMENT HAS BEEN CONNECTED, initial adjustments must be made using the following outlined procedure:

1. Using a voltmeter, check the DC supply that will be used at the transmitter and receiver for correct voltaqe

(8.8 - 16.2 volts).

2. Connect DC power to all AFO-IIB equipment.

3. The AFO-IIB equipment with the automatic transfer feature must be initialized by turning the transfer relay over momentarily to allow the battery to operate the primary

AFO-IIBT Transmitter.

NOTE

The equipment will not be damaged if DC power is applied with the wrong polarity, but the protective fuses will be blown and must be replaced before further operation.

4. Connect a DC voltmeter {minimum 10,000 ohms/volt sensitivity and a 0-10 volt range) across the relay terminals.

5. When power is applied, a DC voltage of at least 6 volts should be developed across the receiver relay terminals.

If the relay does not pick up, loosen the lock nut on the sensitivity adjustment on the receiver and turn the shaft clockwise until the relay picks up. Then lightly tighten the loc~ nut.

NOTE

If the relay fails to energize, check all connections on the transmitter, receiver, track coupling units, and reactors. Also check that the block lengths have not exceeded specifications shown in Figures

3-3 through 3-6 inclusive.

6051, p. 4-4

TRACK

ARRESTORS

Hl

H2

AFO-II8T

TRANSMITTER

(Pria,ary)

4

AFO-II8

TRANSMITTER

(STAND-SY)

BATTERY POSITIVE

BATTERY NEGATIVE

Figure 4-2. Typical Wiring Connections of AFO-IIB

Transmitter Equipment with the Automatic

Transfer Feature

TABLE 4-1. INTERNAL TERMINAL BOARD CONNECTIONS

FREQUENCY (HZ)

CLASS

885

1050

1330

1860

2540

3360

1

CLASS 2

930

1120

1420

2140

2720

3410

CONNECT

WIRE (COLOR) ON TERMINAL

BLACK BROWN

WHITE

BLUE

To Term. To Term. To Term. To Term.

1

2

3

6

7

8

1

2

3

6

7

8

1

2

3

4

4

4

1

2

3

4

4

4

6.

Connect a 0.06 ohm resistance shunt across the rails at the receiver track connections using rail clamps to insure a good contact.

IMPORTANT NOTE

In no case should the receiver be adjusted for a shunt of less than 0.06 ohm resistance.

If a higher resistance shunt is used, the overlap distance will be increased proportionately.

6051, p. 4-5

TRACK COUPLING UNIT

N451052-1901

..-,:u~C."

11'1 PUT

Ll!PID Z l"zl

L!:.i o .

E

SEC. c:;,_. - - I ~ T'2ACI( CIJTPIJT'

LE.AP

Z c.,Rc.u,T D .. .,.-.. ,-:zA..,. ;: ,.-,

OOA><..0 " ,

N451053-5801

TRACK COUPLING UNIT

N451052-1902

L2.

'-!

. ? •

---1

~,

Cl

R .

3

1RACK OIJ'fPIJT

LEAD 1

(I

-7...;

-1

~Ic+

O\JTPUT ll'IPIJT ci1

TQAC.K OVTr:>IJT'

!J

LE.AD 2.

Figure 4-3.

CIIZC.UIT DtAG.ll.•M FOR l?>O'°' R.D

"2

N451053-5802

Internal Wire Conn~ctions for Track Coupling Units

Class 1 or Class 2 Units

6051, p. 4-6

IMPORTANT NOTE

This adjustment should be made when the ballast is in good condition (20 ohms or higher per one thousand feet). This will avoid any appreciable decrease in shunting sensitivity with any further improvement in ballast. Also, all batteries must be fully charged and

ALL track equipment connected.

7. Loosen the receiver sensitivity adjustment lock nut and adjust the receiver sensitivity so that the relay just drops out with the shunt in place. Observe and record the voltmeter reading.

8. Tighten the sensitivity adjustment lock nut and check the voltmeter to see that such tightening has not changed the voltmeter reading. If necessary, loosen the nut, readjust the sensitivity and tighten the nut again.

9. Remove the track shunt. The relay should then pick up.

10. Check that the circuit shunts with a .06 ohm shunt at the transmitter end of the circuit.

NOTE

If a transmitter or receiver is ever removed or replaced in service, the circuit must be readjusted.

Multiple receivers are frequently used to provide several track circuits with one transmitter. The shunting of each receiver must ~e adjusted individually. Adjustment of one receiver will not appreciably affect the adjustment of another receiver.

After completing all adjustments, a check should be made throughout the AFO track circuit, end to end, to insure that the track relay will shunt down with a 0.06 ohm shunt anywhere within the limits of the track circuit. (Between the transmitter and all receivers).

6051, p. 4-7/8

SECTION V

FIELD INSPECTION AND SERVICING

This section contains the information necessary for routine inspection and to determine the causes of failure or faulty operation of the equipment in the field. Repairs to transmitters, receivers and other components should not be attempted in the field. A defective unit should be replaced, and then repaired.

AFO-IIB troubleshooting may be accomplished in two ways. The maintainer may take test equipment with him to make input and output voltage measurements of the APO receivers and transmitters. Or, he may carry a spare transmitter and receiver which are in good working order, and substitute these in turn for each unit of an installation, until the faulty unit is found. The use of complete units for the substitution method of troubleshooting is preferable.

NOTE

If, during field servicing, it is necessary to replace a transmitter, a receiver unit, or a receiver relay to correct a malfunction, the circuit should be readjusted in accordance with procedures given in Section IV of this service manual.

A. FIELD TEST EQUIPMENT

A basic equipment requirement for AFO-IIB field inspection and maintenance under either plan noted above is a DC voltmeter for checking the battery supply voltage. Where an extra transmitter and receiver of the proper frequency may be taken to the installation requiring maintenance, no other test equipment will be needed. Where an extra transmitter and receiver are not available, use a multimeter with a 5000 ohms per volt minimum input impedance, a 0-2.5 VAC RMS range, and a 0-50 VDC range.

B. PERIODIC INSPECTION

The inspections shown below are all that are required, and may be performed on whatever schedule the customer deems necessary.

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

2. Check the lightning arresters to determine whether they are in good operating condition.

3. Using a DC voltmeter, check the battery voltage for

8.8 to 16.2 volts.

4. Shunt the track circuit and check the control relay voltage with a DC voltmeter and compare it with the last recorded reading.

6051, p. 5-1

5. In the AFO-IIB systems with the automatic transfer feature, remove the fuse from the primary AFO-IIBT unit and check that: a. Transfer relay is de-energized. b. Mating receiver relay is energized.

6. Reactivate the primary unit by momentarily turning over the transfer relay to allow the battery to operate the primary unit.

C. TRACK UNITS FIELD SERVICING

1. Equipment Substitution Method

Where a spare transmitter and receiver of the correct frequency are available, the following method may be used to determine the cause of failure or improper operation of an

AFO track circuit installation. a. Using a DC voltmeter, check the battery for a reading of 8.8 to 16.2 volts. b. Substitute a spare transmitter for the original transmitter and check for correct operation. If operation is not correct, proceed to Step c below. c. Substitute a spare receiver for the origina.l receiver, and check the correct operation. NOTE Receiver will need adjustment according to Section IVE. If operation is now correct, reconnect the original transmitter and check for correct operation (both receiver and transmitter could be defective). Re-adjust the track circuit again according to Section IVE. d. If neither the battery, transmitter, or receiver are at fault, check the track bootleg connections, and the AFO relay. A defective Track Coupling Unit, where one is used, may be a cause of the difficulty. Check all terminals used in the coupling unit

to

ensure proper connection. See Section IV, C. for typical wiring connections in the coupling unit.

2. Voltage Measurement Method

As an alternative to the foregoing, the receiver and the transmitter output voltages may be measured to determine the condition of these units. Proceed as follows: a. Using a DC voltmeter, check the battery voltage for

8.8 to 16.2 volts.

6051, p. 5-2

b. Using the 10,000 ohms-per-volt DC voltmeter, measure the receiver output voltage at terminals #5 and #6 for a value equal to or higher than the pickup voltage of the

AFO relay. If this voltage is at the pickup voltage or above, the difficulty will be in the AFO relay or the wiring between the unit and the relay. c. If the voltmeter reading at #5 and #6 shows low voltage or no voltage, recheck the track circuit adjustment as outlined in Section IV. d. If the receiver output voltage is not obtained by performing the above check, disconnect the transmitter from the track circuit.

Then, with a 2.0 ohm load resistor across the transmitter output terminals, measure the transmitter output voltage using an AC voltmeter. The signal is modulated, so the reading should be taken with an oscilloscope. The output should be approximately 4.2V P-P during the "on" period of the modulation. If a VOM is. used to read the output,then the voltage should be above 0.8 v rms.

If the voltage is less than these values, the transmitter requires repair and should be replaced by another unit. If neither the receiver nor transmitter is faulty, the problem may be in the track leads or connections, or in the rail bond connections.

WARNING

AFO Equipment is designed to operate over a normally expected variety of environmental conditions, however, electric propulsion equipment employing phase control or chopper control may create an excessive amount of electromagnetie interference in the audio spectrum, thereby causing improper and potentially unsafe operation of AFO receivers.

Proper application of AFO Equipment under the conditions of interference described above requires special engineering an_alysis.

Please contact your sales representative to discuss your application if you should have any reason to believe that your AFO Equipment will be subjected to audio frequency interference.

Addendum

1

6051, p. 5-3/4

SECTION VI

TROUBLE ANALYSIS, TEST POINTS AND OSCILLOGRAMS

A. GENERAL

1. Detailed Circuit Description - Transmitter

(a) Carrier-Modulator Board - N451522-05XX (Refer to top Figure 6-3)

This board consists of a carrier circuit and the modulation circuit. The carrier oscillator uses a conventional Colpitts circuit with frequency determined by adjustable inductor Ll and capacitors C2 and C3. The feedback ratio of

C2 and C3, as well as the L-C ratio of the tuned circuit, insures good frequency stability.

The output of the oscillator is summed with the output of the modulator circuit. The frequency determining components of both the carrier oscillator, as well as the modulation oscillator, are shown in the tabulation of the circuit board.

The generation of the modulation frequency is accomplished by using a Twin-"T" circuit. The sinusoidal output of the Twin-"T" circuit is amplified and coupled by an RC network to an electronic switch QlO where the signal is reshaped into a square wave. The conduct or non-conduct condition of the output of the electronic switch is applied to the output of the carrier oscillator. The combined signal is then capacitive coupled to a Darlington amplifier circuit consisting of Q2 and Q3.

The base of Q2 is biased to about three-fourths the DC supply voltage to ensure proper operating level of the complementary emitter follower stages QS and Q6 in order to avoid distortion of the signal at low battery voltages. The output of the QS, Q6 amplifier is the output of the

Carrier-Modulation Board, and the signal is fed through CS to the Transmitter Driver Board.

(b) Transmitter Driver Board N451522-06XX (Refer to

Bottom Figure 6-3)

The output of the Carrier-Modulator Board is fed to the driver board where the signal is transformer coupled to the push-pull amplifier stage comprised of Ql and Q2. The output of the Ql, Q2 amplifier is push-pull coupled to the output transformer T2.

The secondary of the transformer is in series with

~~e resonant Ll-C2 circuit which couples the signal from the output transformer T2 to the track. The

6051, p. 6-1

DC voltage for the Carrier-Modulator Board is supplied from the Transmitter Driver Board through

L2. L2 in combination with C6, which is located on the Carrier-Modulator Board, filters transient spikes on the incoming battery lines, while D6, also located on Carrier-Modulator Board, clips any spikes exceeding 20 volts peak amplitude. In addition, if the battery is connected with reverse polarity to the Carrier-Modulator Board, D6 will conduct in the forward direction and blow the fuse

Fl on the front panel, thus protecting the internal circuitry.

(c) Transfer Board--N451522-1402, AFO-IIBT Only

(Refer to Figure 6-4)

A modulated carrier signal is applied to both points

Hand I on the transfer board. On channel 1, Diode

Dl and Capacitor Cl rectify the input signal resulting in a DC voltage across load resistors Rl and R2.

Similarly channel 2 input signal is rectified by

Diode D3 and Capacitor C2 resulting in a DC voltage across load resistors R3 and R4. The two channels are fed into an "And" gate consisting of diodes D2,

D4, DS and resistor R6. The Schmitt trigger circuit consisting of transistor stages Ql and Q2 is actuated when the input levels to the 2 input "And" gate is of proper level. The operating point is calibrated by means of TBD resistors Rl and R3 which are selected during initial testing.

When transistor Ql is switched on then transistor Q2 will be off. This in turn will turn the output stage

Q3 on. Zener diode D6 is used as a level shifter to compensate for the high DC level of Q2 collector in the on stage. - DB is used to provide the output stage noise immunity while diode D7 is used as a snubber diode for the external relay coil to be connected to

G and F.

2. Detailed Circuit Description - Receiver

(a) Amplifier/Demodulator Board - N451522-03XX (Refer to top Figure 6-5)

The track signal is applied to the Amplifier/

Demodulator Board through a low impedance, series tuned filter comprised of Cl and Tl, to amplifer

Ql. The filtered AFO signal is then capacitive coupled by C2 to a variable gain amplifier Ql. The gain is adjusted at the time of installation with the Relay Volts potentiometer R4. The signal is further amplified and filtered by a high selectivety band pass filter comprised of Ll, C3 and L2, c4.

The signal is then demodulated and filtered by QS and Q6 to allow only the assigned modulation

6051, p.

6-2

frequency to pass to the Relay Driver Board.

Capacitor C9 provides decoupling of battery ripple from the DC power buss to prevent false relay energization.

(b) Relay Driver Board - N451522-0202

(Refer to bottom Figure 6-5)

The output of the Amplifier/Demodulator Board is resistive coupled to amplifier Ql, where i t is further amplified and fed to a complementary power amplifier comprised of Q3 and Q4. Transformer

Tl couples the AC signal to a full wave bridge rectifier, BR-1, where i t is converted to a DC voltage for the appropriate class relay. Zener diode Dl and capacitor CS are included on the board as a surge filter to protect the solid state components from voltage spikes.

B.

TROUBLE LOCALIZATION OSCILLOGRAMS

Figure 6-1 .provides oscillograms which represent the typical waveforms and voltage levels present at various points within the AFO-IIB Transmitter/Receiver circuitry. Each oscillogram is presented with reference to a particular test point(s).

Figures 6-2, 6-4 and

6-6 show the physical location of the various test point, while Figures 6-3, 6-5 and 6-7 show the test point(s) schematic locations.

NOTE

The oscillograms are used to represent typical waveforms and voltages that can be found in AFO-IIB equipment. Small variations of waveforms and voltages may be present on the particular unit being tested.

Service of the AFO-IIB equipment should not be attempted by unqualified personnel .. Personnel assigned to service AFO-IIB equipment should have had previous experience with the type circuitry found in AFO-IIB equipment. In as much as i t is difficult to predict specific.failure, successful repair will depend on the ability of repair personnel to understand both the overall function of the equipment as well as the function of the individual circuits.

6051, p.

6-3

When the AFO-IIB units require repair in the service shop, provisions must be made for placing the proper impedance between the AFO-IIB Transmitter output (or function generator output) and the input of the receiver. Figure 6-8 shows a block diagram of the power input and unit interconnections that must be provided while test bench servicing.

If an AFO-IIB Receiver is being bench tested and the matching

AFO-IIB transmitter is not available for producing the required input signal, a function generator can be used as substitute for the transmitter. See Figure 6-9.

The frequency and modulation rate of the function generator will have to be set according to the particular receiver being tested.

Due to the frequency selective characteristics of the AFO-IIB

Receiver, the function generator must produce exactly the required frequency and modulation rate.

6051, p. 6-4

j

)

J

Figure 6-1. Trouble Analysis Oscilloscope Connection

Points

NOTE

The oscilloscope horizontal sweep rate settings required to produce the represented waveforms will vary, dependent on the particular frequency and code rate of the AFO-II unit being tested.

OSCILLOSCOPE CONNECTION POINTS 1 THROUGH 9 - TRANSMITTER

POINTS 10 AND 11- AFO-IIBT Transfer

BOARD

OSCILLOSCOPE comlECTIOU

POINT

CD

VERT. 2V/DIV.

OSCILLOSCOPE CONNECTION

POINT@

VERT. 2V/DIV.

6051, p. 6-5

OSCILLOSCOPE CONNECTIOH

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6051, p. 6-6

OSCILLOSCOPE COtmECTION

Point©

VERT. 2V/DIV.

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POINT

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VERT. 2V /DIV.

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POINT

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VERT. SV /DIV.

6051, p. 6-7

"

Item

23

22

4 or

5

18

6. Track Coupling Unit Parts List for Boards 451053-5801 and -5802.

Refer to Figure 7-9, Track Coupling Unit Circuit Board, for item reference number and component location. Track

Coupling Unit schematic diagram is shown in Figure 4-3.

Description

Cl, C3 Capacitor 1.0 MFD.

C2, C4 Capacitor 2.0 MFD.

Ll, L2 Inductor, Toroidal

(Used on board -5801) or

Ll, L2 Inductor, Toroidal

(Used on board -5802)

Tl Transformer

WABCO Part No.

J701760

J702617

N398916-001

N398816-002

N451039-1202

6051, p. 7-27

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C. Hardware and Wiring

1. AFO-IIB Transmitter hardware parts list and wiring diagrams are shown in Figures 7-4, 7-4a, 7-5, 7-6 and 7-7.

2. AFO-IIB Receiver hardware parts list and wiring diagrams are shown in Figures 7-1, 7-2, and

7-3.

3.

AFO-IIB Coupling Unit hardware parts list and wiring diagrams are shown in Figures 7-8 and 7-9.

4. AFO-IIB Blocking Reactor parts list and wiring diagrams are not shown because this unit is non-serviceable and must be replaced rather than repaired.

6051, p.

7-29

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Test Point Schematic Locations (Transmitter}

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6-9/10

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AFO-IIBT Transfer Board

Schematic Diagram for Transfer Board PCB

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AFO-IIBT Transfer Board

6051, p. 6-11/12

Figure 6-1. (Continued)_

OSCILLOSCOPE CONNECTION POINTS 12 THROUGH 19 (RECEIVER}

OSCILLOSCOPE CONNECTION

POINT

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VERT. lOMV/DIV.

OSCILLOSCOPE CONNECTION

POINT

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VERT. • SV /DIV.

6051, p. 6-13

OSCILLOSCOPE CONNECTION

POINT

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OSCILLOSCOPE CONNECTION

POINT

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VERT. • 2V /DIV.

OSCILLOSCOPE CONNECTION

POINT

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VERT.

2V/DIV.

6051, p. 6-14

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VERT. lV/DIV.

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6051, p. 6-17/18

I

AFO-IIB

3

TRANSMITTER

2

4

MATCHED

PAIR

BY

(FREQUENCY)~

AF0-IIB

RECEIVER

I

2

+

(12VDC)

+

(12VDC)

Figure 6-8. Test Bench Set-Up Using Matched Transmitter and

Receiver

*Adjust potentiometer to provide the receiver with the voltage indicated on oscilloscope connection point

10·

(Figure

6-1).

FUNCTION

GENERATOR ( :.

OUTPUT**

-

AFO-IIB

RECEIVER

+_

(12VDC)

Figure

6-9.

Test Bench Set-Up for Receiver Using Function

Generator

*

**

The frequency and modulation controls must be set according to that of the receiver being tested.

The output amplitude must be set to provide the receiver with the voltage indicated on oscilloscope connection point

10 (Figure 6-1).

6051, p. 6-19

c.

Peripheral Equipment Testing

1. AFO IIB Track Coupling Unit

The Track Coupling Unit is non-serviceable, therfore testing· is not required. A defective unit should be returned to

WABCO for repair or replacement.

2. AFO Blocking Reactor

The Blocking Reactor is also non-serviceable, therefore testing is not required. The reactor is non-repairable and should be discarded.

6051, p. 6-20

SECTION VII

PARTS LOCATION AND LISTING

The parts lists and information presented herein are divided into three groups. These groups and the information they contain are listed as follows:

A. Complete Unit Parts List

B. Circuit Board Component Location and Parts Lists

C. Hardware and Wiring

A. COMPLETE UNIT PARTS LIST

This section tabulates the ordering references for the AFO-IIB units and circuit boards, as well as the peripheral equipment normally associated with AFO-IIB track circuits. They may be ordered directly from Westinghouse Air Brake Company, Union

Switch & Signal Division, Swissvale, Pa. 15218, by specifying the part number and description from the following table.

Operating

Frequency(Hz) carrier-Mod.

885-18

930-18

1050-22

1120-22

1330-27

1420-27

1860-39

2140-39

2540-49

2720-49

3360-68

3410-68

4565-94

5090-94

6180-139

6330-139

TABLE 7-1. AFO-IIB and AFO-IIBT PART NUMBERS

AFO-IIB

Transmitter

N451052-

1601

1602

1603

1604

1605

1606

1607

1608 -

1609

1610

1611

1612

1613

1614

1615

1616

AFO-IIB

Receiver

N451052-

1617

1618

1619

1620

1621

1622

1623

1624

1625

1626

1627

1628

1629

1630

1631

1632

Unit

Coupling

N451052-

1901

1902

1901

1902

1901

1902

1901

1902

1901

1902

1901

1902

AFO-IIBT

Transmitter

N451052-

2601

2602

2603

2604

2605

2606

2607

2608

2609

2610

2611

2612

2613

2614

2615

2616

Blocking Reactor (All AFO-IIB Freq.) N451036-0302

Surge-Ripple Filter, 12VDC, 2.SA

Lightning Arrester, USGA

Lightning Arrester, USGA

Lightning Arrester, USGA

N451036-0702

N451552-0302

N451552-0101

N451552-0301

6051, p. 7-1

B. CIRCUIT BOARD COMPONENT LOCATION AND PARTS LIST

The.parts listed in this section are divided into two categories listed as "Basic Components Parts List" and "Frequency

Determining Parts List." The components that are the same value for all boards of a certain type are listed in the

"Basic Components Parts List." In order to provide a complete circuit board which will operate on the desired frequency with the proper modulation rate, components are added to the "Basic Boards" which vary in value depending on the particular frequency and modulation. The components which vary in value are listed in the "Frequency Determining

Parts List" portions.

In order to select the appropriate value component for a particular frequency circuit board being serviced, the suffix number of that board must be noted. If the component in question is a frequency determining device, its value will depend on the suffix number of the board. (The suffix number of each circuit board is listed in the far left column of each "Frequency Determining Parts List").

6051, p. 7-2

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..._.,._,:t.i:-"':...1:,.:.:i:..-'--~:.-!

11.,1,,1....,:.!11111~_:;;;;;;...,;;.:=~::::!~:;:~;,::,:~I..J

••

Relay Driver

Board #2

N451522-

0202

6051, p. 7-3/ 4

RECEIVER SUBASSEMBLIES

1. Amplifier/Demodulator Board Basic Components Parts List for Boards 451522-0303 through 0318.

Component location is shown in Figure 7-2. Refer to top of Figure 6-5 for Amplifier/Demodulator schematic diagram.

Item Description

Cl,CS

C2

C6, ClO

C7 ca

C9*

Cap.

Cap. 0.56 MFD,

Cap.

5%,

200V

1.0

MFD, 5%, 200V

Cap. 22MFD, 10%, 15V

Cap.

Cap. 47 MFD., 20%, 50VDC

Dl

D2

Diode, 1N4003, lA, 200 PIV.

Diode, HD4418, 20 PIV

Ll, C3

L2, C4

L3

Ql

Q2-Q6

Choke-Pot Core

Choke-Pot Core

Choke, 40Hy., 360 ohms

Transistor, 2N3644, PNP,

Silicon

Transistor, 2N3643, NPN,

Silicon

Rl,R3,R8

R2 ,Rl2

RS

R6,R21,R23

R7-Rl0

R9

Rll

Rl3

Rl4,Rl9,R22

R15,R16

Rl7

Rl8,R20

Resistor, lOK ohm, 5%, l/2W

Resistor, 15K ohm, 5%, 1/2W

TBD

Resistor, ·2K ohm, 5%, l/2W

Resistor, 30K ohm, 5%, l/2W

Resistor, 3.9K ohm, 5%, l/2W

Resistor, 5.6K ohm, 5%, l/2W

Resistor, 4.7K ohm, 5%, l/2W

Resistor, 100 Ohm, 5%, 1/2W

Resistor, 2.7K ohm, 5%, l/2W

Resistor, 6.8K ohm, 5%, l/2W

Resistor, 24K ohm, 5%, l/2W

Tl

Transformer

WABCO Part

No.

See Table

J706848

J706813

J706526

See Table

J709052

J723555

J723742

See Table

See Table

J709032

J731283

J731282

J720883

J720885

J721080

J721260

J720764

J720768

J720892

J721194

J720758

J720893

J721212

See Table

*

C9 is a special safety capacitor selected by WABCO which must be replaced only with an exact type equivalent.

6051, p. 7-5

O'I

0 u,

'U

...J

I

°'

SUF'FJX

USING

UI\SIC

PCB-0302

0 '.103

0.104

0305

0306

0 307

0308

0)09

OHO

0 .ll l

0312

0313

OJ14

0315

0316 o

JI

7

0Jl8

CARRIER MODULATION

FREQUENCY FREQUENCY

IIZ IIZ

-

885

930

1050

1120

1330

1420

1860

2140

2540

2720

3360

3410

4565

39

49

49

68

68

94

18

18

22

22

27

27

)9

5090

6180

6.130

94

139

139

POT CORE CIIOKE

Ll

&

CJ

L2 & C4

UN451030-

-1101

-1102

-1103

-1104

-1105

-1106

-1107

-1108

-1109

-1110

-1111

-1112

-1136

-1137

-1138

-ll39

NOTE fl:

Cl may require a Padding Capacitor.

See Table 7-2.

NOTE B: CB may require a Padding ca::,aci tor.

See 1'able 7-3.

AMPLIFIER/DEMODULATOR FREQUENCY DETERMINING

COMPONENTS PARTS LIST (CONTINUED)

(REFER TO FIGURE 7-2)

-

TRANSFORMER CAPACITOR Cl

(See Note Ill

CAPACITOR CS

Tl

PI\RT rm.

MFD. Tol. WVDC PART NC. MFD. Tol. WVDC

J7068l5

J7068 l3

J709054

J70905S

J706812

J706814

J709060

J709039

J709075

N4 3556(,

N435566

N435567

N435567

N435568

N435568

N435569

N435569

N435570

N4J5570

N43557l

H435571

N436442

N436443

N436444

N436444

Part No.

2.0

LO

.68

.47

, 15

.068

.047

.015

.01

,77068)8

5.0 5\ 200V

J7068J8 5.0 5\ 200V

,1706838

5.0

5\ 200V

J706838 s.o

S\ 200V

J706817 4.0 5\ 200V

J706817 4,0 S\

200V

J706815

2.0

5\

200V

J706815 2.0

J706815 2.0 5\ 200V

J706815

2.0

5'1.

200V

J709087

1. s

St

5\

200V

200V

J709087

1.5 5\

200V

J709145-

1.25

5\

200V

007

J706813

1.0 5\ 200V

J706586 .0050

J706585

.OOJ9

J706C.7l

.OOJJ

J70667l

J709037

J709038

,0033

5\ IOOV

5\ IOOV

2\ lOOV

2\ lOOV

,0027 S\ lOOV

.0022 5\ lOOV

J709040 .0018

J709040

J70904l

J709042

St lOOV

.0018 S\ lOOV

.0015

5\ lOOV

.0012 5\ lOOV

J709042

J7090 42

.0012

.0012

St lOOV

5\ lOOV

J709059 ,00082

5\ soov

J702996 .00075 5\ SOOV

.1706813 1.0 5\ 200V

J70681 3

TABLE 7-2

1.0

St

------· ---

200V

J709997 .00062

5\ soov

J709 l 19 .00056 SY, SOOV

TABLE 7-3

MFD. Toi.

WVDC

Part No. MF'D. Toi, WVDC

S\

S\

5\

5\

S\

5\

S\

5\

5\

200V

200V

200V

200V

200V

200V

200V

200V lOOV

J709039

J706814

J706827

,1706812

J709056

,015

5\

.OG8

S\

.10

.15

.33

5\

5\

51

200V

200V

200V

200V

200V

PI\RT NO.

CAPACITOR CS

(see Note Bl

MFD. ·rol.

J709087

J709087

J706813

J706813

J7090 54

J709054

J709087

J709087

J706852

J706852

J709055

J709055

J709l44-

0091

J709144-

0091

J706827

J706827 l.

5 l. 5 l. 0

1.

0

.68

.68

1.5

1.5

,82

.82

.47

.47

.22

.22

.10

.10

5'1, si

5i

51

5\

5\

5\

5\

10\

10\ si

5\

5'1,

5\

51

S\

WVDC

200V

200V

200V

200V

200V

200V

200V

200V sov

50V

200V

200V

200V

200V

200V

200V

I

BU.

ll.

R2

C:J

0(

\__ _j

:

= g

Tl

M... o

5

s

O s c:m

~ n nn

~ o " o

Ill. LG.

Tl'2 o.

11

TP7 c:

u· n·;~unnu

uuu

1

......... o o

~

I ! n,

L

r"""'

t~

I

1 '

_J

L

_J

0

R3 TPJO CZ nnr, n r

1,) n

r,:··

U u ot'

15

U I '- Uu o

(° \

,.

z

l11n u mo L

I l

J

~1:J ~\

8Cu

nucs'-.

/L,

[

-.

f _)

o o,\

A

O

Oen

1..1c1

04f)~D2L

~

ODum

O m cs r

1

L

Jc•

+n 'm

r)

c::i

Ua11 r --, m

I

LJ

OTP!

R15

C

:J ·

I

' - . .

---i

\ cc ·

!

ai

J ... ,,.

/ u

a

Bli ~· no o o

LJl11 Cl

c:::i

112

Figure 7-2. Amplifier/Demodulator Parts Location Diagram

6051, p. 7-7

Item

BR-1

Cl,C3-C6

C2

C7 ca

Dl

02-04

Ll

Ql,Q2

Q3

Q4

QS

RECEIVER SUBASSEMBLIES (Continued)

2. Relay Driver Parts List for Board 451522-0202

Component location is shown in Figure 7-3. Refer to bottom of Figure 6-5 for Relay Driver schematic.

Rl,R6

R2

R3

R4

RS

R7,R8

R9 ,RlO

Tl

Description

Bridge Rect. l.SA, lOOV PIV

WABCO Part No.

J723998

Cap • • 001 MFD, 10%, SOOV

Cap. 22 MFD, 10%, 35V

Cap. 1000 MFD. -10, +75%, 40V

Cap. 100 MFD. +100, -10%, 25V

J706242

J702956

J709036

J070826

Diode, Zener, 1N2984A, 20V, 10%, lOW

Diode, HD4418, 20V PIV

J726117

J723742

Coil, Suppressor N451040-4101

Transistor, 2N3643, NPN, Silicon

60V

Transistor, 2N2270, NPN,

Silicon, 60V

Transistor, 2N4037, NPN,

Silicon, 60V

Transistor, 2N3644, PNP,

Silicon, 60V

J731282

J731186

J731291

J731283

Resistor, 100 Ohm, 5%, 1/2W

Resistor, 2K Ohm, 5%, l/2W

Resistor, 6.2K Ohm, 5%, l/2W

Resistor, lOK Ohm, 5%, l/2W

Resistor, 680 Ohm, 5%, l/2W

Resistor, 47 Ohm, 5%, l/2W

Resistor, 2.7 Ohm, 5%, lW

Transformer

J721194

J721080

J720771

J720883

J720773

J721189

J735362

N451039-0803

6051, p. 7-8

0

N451522-0202

[ BOARD2RE~:url

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Cl

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er

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RI

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R6 u

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OTP2

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RS Cll Cll nR2

05-._..., v

C ::J

C:::J

II: :J

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LJ

-i

0

COMPONENT SIDE

Figure 7-3. Relay Driver Parts Location Diagram

6051, p. 7-9/10

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Complete

N451os2-

Carrier/Mod.

Board

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N451522-

J -

Transmitter/Driver

Board #2

N451552-

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0605

0606

0607

0608

0609

0610

0611

0612

0613

0614

0615

0616

0617

0618

3

·1402

AFO-IIBT Transmitter Main Assembly

Figure 7-4a.

6051, p.

7-13/14

· - - · · · - - - - - - - - - - - - - - - - - - - ·

TRANSMITTER SUBASSEMBLIES

3. Carrier Modulator Basic Components Parts List for Boards

451522-0503 through 0518.

Component location is shown in Figure 7-5. Refer to top of Figure 6-3 for Carrier Modulator schematic diagram for item reference.

Item

Cl

C4

C5,C9,C14

C6

C7

C8

ClO

ClS

Dl-D3,D8

D4,D5,D7

D6

Description

Cap. 100 MFD., 10%, 20V

Cap. 1.0 MFD., 5%, 200V

Cap. 33 MFD., 10%, 20V

Cap. 100 MFD., +100, -10%, 25V

Cap. 580 MFD., +75, -10%, 30V

Cap. 68 MFD., 10%, 20V

Cap • • 001 MFD., 10%, 200V

Cap. 10 MFD., 10%, 20V

Diode, HD4418, 20V PIV

Diode, 1N4003, lA, 200V PIV

Diode, 1N2984, 20V, 10%, lOW

Ql-3,Qll

Q4-Q5

Q6

Q7-Ql0

Transistor, 2N3643, NPN,

Silicon, GOV

Transistor, 2N2270, NPN,

Silicon, lA, GOV

Transistor, 2N4037, PNP,

Silicon, lA, GOV

Transistor, 2N3644, PNP,

Silicon, GOV

Rl

R2

R4

RS

R6

R7

R8,R9

RlO

Rll,Rl2,R26

Rl5, R20

Rl6,Rl8

R19

R21

R22

R23

R24

R25

R27

Resistor, 2.2K Ohm, 5%, l/2W

Resistor, 4.7K Ohm, 5%, l/2W

Resistor, 16K Ohm, 5%, l/2W

Resistor, 33K Ohm, 5%, l/2W

Resistor l.5K Ohm, 5%, 1/2W

Resistor 200 Ohm, 5%, l/2W

Resistor 2.7 Ohm, 5%, 1 W

Resistor, 75 Ohm, 5%, l/2W

Resistor, 22K Ohm, 5%, l/2W

Resistor, 30K Ohm, 5%, l/2W

Resistor, TBD

Resistor, 8.2K Ohm, 5%, l/2W

Resistor, 2K Ohm, 5%, l/2W

Resistor, l.2K Ohm, 5%, l/2W

Resistor, 27K Ohm, 5%, l/2W

Resistor, lK Ohm, 5%, l/2W

Resistor, 100 Ohm, 5%, l/2W

Resistor, 680 Ohm, 5%, ~W

WABCO Part No.

J706416

J706813

J706618

J070826

J706985

J706160

J709035

J706373

J723742

J723555

J726117

J731282

J731186

J731291

J731283

J720842

J720892

J723566

J720889

J721064

J721250

J735362

J723222

J720843

J721260

J720775

J721080

J720820

J720759

J720882

J721194

J720773

6051, p. 7-15/16

CARRIER-MODULATOR FREQUENCY DETERMINING

COMPONENTS PARTS LIST (CONTINUED)

(Refer to Figure 7-5)

0512 osn

0514

0515

0516

0517

0518

V451522-

Board Having

Suffix

0503

0504

0505

0506

0507

0508

0509

0510

0511

Carrier

Frequency

HZ

885

930

1050

1120

1330

1420

1860

2140

2540

2720

3360

3410

4565

5090

6180

6330

94

139

139

49

68

68

94

Modulation

Frequency

HZ

18

18

• 22

22

27

27

39

39

49

Pot Core Chokej

Ll, C2

&

CJ

UN451030-

Capacitor Cll

1 · - - · -

Part No. I MFD. I .Tol. I WVDC

-0927

-0928

-0929

-0930

-0931

-0932

-0933

-0934

-0935

J706810

J706810

3706809

J706809

J706808

J706808

J706807

J706807

J706806

2 .• 0

2.0 l. l. s s

LO

1.0

.68

.68

.47

5'l s,

S'l s,

5'1.

5\

51

51

S\ lOO"v lOOV lOOV lOOV lOOV lOOV lOOV lOOV lOOV

-0936

J706806

.47

SI lOOV

-0937

-0938

J706806

J706806

• -17

.47

5\ s, lOOV lOOV

-1144

J709145-

0021

.22

51 lOOV

-1145

-1146

J70914S-

002l

.22 SI lOOV

-1147

J709145-

002l

.22 s, lOOV

370914 5-

0021

.22

51 lOOV

Capacitor Cl2, Cl3

Pa;~ no.

Resistor RJ Resistor RlJ. Rl4 Resistor Rl7

·1

·;F~·.-·

J

Tol.

I

W\TDC

Part No. K Ohms

I

:i-01.

·I

Watt Part No.

I

K Ohms

I

Tol.

I

Watt. Part No. K Ohms Tol.

I

Watt.

J706808

J706808

Ji06807

J706807

J706806

J706806

J706805

J706805

J709145-

0021

J709145-

0021

J709145-

002l

J709145-

002l

J709145-

0015

J70914S-

0015

J709145-

00l5

J709145-

0015

1.0

1.0

.68

.68

.47

.47

.33

.33

.22

.22

.22

.22

.1

.1

.1

.1

51

S\

51

5\

5\

5\

5\

51

51

51

51

S\

5\

5\

5\

51 lOOV lOOV lOOV lOOV lOOV lOOV lOOV lcJOV lllOV rnov lOOV lOOV lOOV lCOV lOOV lOOV

J72J566

J72J566

3723566

J723566

J72)566

J723566

J720821

J723566

J721258

J7JS254

J7231]4

J723134

J723134

J72]1J4

J723134

3723134

16.

16

16

16

16

16

12

16

11

13

9.1

9.1

9.1

9.1

9.1

9.1

SI

S\

51

5%

SI

5\

SI

5\

SI

S\

51

51

S\

51

S'l

SI

1/2

1/2

1/2

1/2

1/2

1/2

1/2

1/2

1/2

1/2

1/2

1/2

1/2

1/2

1/2

1/2

3735100

3735100

3735498

J735498

J735079

J7]5079

J735079

J735079

,17

35106

J735106

J735325

J735325

J735794

J735794

3735119

3735119

11

11

12.7

12.7

15.4

15.4

15.4

15.4

17.8

17.8

13

13

20

20

13~ 7

13. 7 l l n u

1% l l l l

11

11 u l'l

I t

1/8

1/8 n u

I

I

11

I lu

I j u

I

1/8

I

1/8

I

.

I

1/8

I

I

1/8

11/8

1/8

1/8

1/8

1/8

1/8

1/8

1/8

1/8

1/8

J735371

J735371

J73532J

J735323

J735451

J735451

J735450

J735450

J735449

J735449

J735323

J735323

J735082

J735082 j735519-

0012

J735519-

0072

6.81

I

6.81

I

I

I

4.53

I

3.09

3.09

3.48

3.48

4.12

4.12

4.64

4.64

4.87

4.87

3. 48

3.48

4.53

I

. u

11

11

11

1\

1'l u

11

11

11

11 n

11

I

I u

I

I

11

I ju

1/8

I

I

1/8

I

I

I

1/8

I

1/8

1/9

1/8

1/8 l/9

1/8

1/8 l,'IJ

1/8

1/8

1/8

1/8

1/8

605lr p. 7-17/18

COMPONENT SI DE

Figure 7-5. Carrier/Modulator Parts Location Diagram

6051, p. 7-19

Item

Cl

Dl,D2

L2

Ql,Q2

Rl

Tl

T2

4. Transmitter Driver Parts List for Boards 451522-0603 to

0618.

Component location is shown in Figure 7-6. Refer to bottom of Figure 6-3 for Transmitter Driver schematic.

Description

Cap., .068 MFD., 5%, 200V

Diode, 1N4003, lA, 200V

Coil, Suppressor

Transistor, 2N3055, NPN,

Silicon, 15A, lOOV

Resistor, 51 Ohm, 5%, l/2W

Transformer, Driver

Transformer, Output

WABCO Part No.

J706814

J723555

N451040-4101

J731263

J721038

N451039-1001

N451039-0802

6051, p. 7-20

N451522

Board Using

Suffix

0603

0604

0605

0606

0607

0608

0609

0610

0611

0612

0613

0614

0615

0616

0617

0618

Pot Core Choke

Ll

&

C2

Part No. N451030-

-3613

-3614

-3615

-3616

-3617

-3618

-3619

-3620

-3621

-3622

-3623

-3624

-3645

-3646

-3647

-3648

,----,

~

N

=

0 l

II

_J

DI~

I

'------_)

~

COMPONENT _SIDE:

Figure 7-6. Transmitter Driver Board Parts Location Diagram

6051, p. 7-21

TRANSMITTER SUBASSEMBLIES

5. Transfer Board Parts List for Board 451522-1402.

ITEli

Cl, C2

C3

Dl-04

DS,07,08

06

Ql-03

Rl, R3

R2, R4

RS

R6

R7

R8

R9

RlO, Rl3

Rll

Rl2

DESCRIPTION

Capacitor, 15 MFD, 20V

Capacitor, 100 MFD, 20V

Diode, 1N277

Diode, 1N4003, lA, 200V

Diode 1N753A, 6.2V, 5%, \W

Transistor 2N3643, PNP, Silicon

Resistor, TBD

Resistor, 18K ohms, 5%

,

Resistor, 3. 3K ohms, 5%,

Resistor, lOOK ohms, 5%,

Resistor, 2.7K ohms, 5%,

Resistor, 6.2K ohms, 5%,

Resistor, l.2K ohms, 5%,

Resistor, lOK ohms, 5%,

Resistor, 2.4K ohms, 5%,

Resistor, 150 ohms, 5%,

~w

~w

~w

~w

~w

~w

~w

~w

~w

WABCO Part

*

J706891

J706416

J723881

J723555

J723914

J731282

J720826

J720888

J720838

J720758

J720771

J720820

J720883

J721255

J721248

6051, p. 7-22

Component Location is shown in

Figure 7-7. Refer to Figure 6-5 for Transfer Board Schematic.

~

DIR u

__.------,

R9

;L-_J

;L-

C2

_r----,

Ct

__J

C::J

/"

n ' ./

••1,1 " nnFtnn

R2UD2ef

03u

D4ej u u

RBLJ , , , . n.. •• n n n nR10

LJ

/ n r

L

11 n

R13LJ lc3

J

nos

~

08~

LI

/''

'- .,,03

. R4 R&LJUUR11

+

07

I[

:J

O

C:

:JO OC :JO

04 Rt

3

0

2

R3

1 n

I H

R12

C:J

0 0 0

F

D

G

N

'qi

Cl: c

=

N c::,

0 m

.....

Cl:

I

LO

LO

.....

LO

'qi z

""" z c

C")

=

CII: c c::,

CD

;t

4

Figure 7-7. Transfer Board Parts Loca~~on Diagram

60 51, p. 7-23/24

PART NO,

RttMA~"•

80...,,D NO.I

8oA~O No.Z

T1111..-..c.-. OuT .. UT

LLAO I

TAAC.IC.

r ...

~IJT

Llf.AD I

{i)

1

.

I

CO""'PONLNT

:?,.oAltD

111!'.1

... en

11-o

.:.

- - - - - - - - - !!'

~

->··[::::}-~::--!::~::}~--

I

I

I

I

•

I

I

I •

I

'

.......

1:

•.

.

~·

.

!11!~

•!""

--

.

..:.

-----

.............

,

~3~~

JJ

...

T,AC..K. %H•UT

LE.AO

Z.

T-....c."-. 0UT--UT

LEAD Z

'!)-. !):

.!:E!!!!t

T:::..0.1.•

...... "t_.,...G,

OIAG,llA.M

A~o·tt n CouP1...1N6 UN,-r

REF

\

OIA.M'r'6•

HoLIE,.

3

--~b~ ... --- --- - -------- --·-----

I

I

•

.

I

I l

.

~

.

~I.

.

..¢_

I

J

I

"

..

...

~·

-.:i u&

I

.!.

.. it

t

,.

~J:: ... •.:

T9'.l'C.I'\ ZHPU1'

I

r-!~t,

·~···

lh :

'1:

~!

1,:t:!,?

:t

:tl l

, cE::!·

.

I.CAD t

1• i!wAecc

=:..~=a:~=.==

--••>"

- -... - - - -

:~ ~•IIT

HO.lll$IOSZ·--

©

T"~~~:u:PUT ...

;.~~a

~

. :

T":':AC:,U;PUT ::: :

.

•6'.

:~

,;; • ..1

. i

=

AF0-118

COUPLING

.

,,,

- :. ::.• __ ; ::,-.. ·J'

.

1-------------"l!

~

J

T

.

T

~

60AttD~ Afl.&. TtJN&O

MC.AN\ Off GA"'"-C. ev

TC".

~

...

~'

~1.:..

.

..

..

:

...• -----.........---..---....----z

: 'f.!=- '.![:' ·: ~

.l.~~--------'"\,,l __ y •

'P

...

::,

,;;

·--· ···!!····· ....

;·

... ·.··::t"''"• .. ··.

;-:::~~,;~::~=.: .....

..

··-r~:

:~---.. n·.,

.. ..

I

•

:~1.; ....

...

..

------·'6•:

.

....

: : . : I : ::'"

,P

::t

,,,

~= : :

!.! : ·::: :•,

: :

f t . . . . . .,. ..

.J ,,... ........

-LI

: -.-t~:.;:_·_-::.:::

I

.,

...

) ,

-:tr

~

COMf'ONU'fT

,...,TH eo.

MU.aT 8& Mau

!.! ft,f

TH1.S l..Oc.A.,:toN.

11

•

..

..

"

>ll

.

,..,

(0J-

vu:w

·ir

= b

Track

Coupling

Unit Compl.

N451052-

1901

1902

PC Boards

Used

N451053-

5801

5-802

*Note

See Table 3-1

NuT, B•NOI-

ft.0.-=-TL.

-,-.aza

113.lll

,_, 410.ll l1.9o41

4064 l:lsl

1-1a,oa

11!)31"

.Sc.&.9 ~~~2.X ~41itl>,, ~TL•

HA3t4'-"'• 6

.!)M"&"

L)C..~"-

CAl"AC.tT_9•

{r••"'"'-~~l

Wll1£

•:ZO(RlO)

WIRE '*2Df.Oll~ll§J

WIRE •ZOITULOWI

'Wlllf 1'20

(~"JENI

., :.X.,rJ

For

Frequencies

*

Class 1

Class 2

--

u..

..._SJ .. s;

!» .....

11

~

,w.;i ... , ..

~FA._... • .....

1ae11l .... i;J..j:i, iJ..a_ !4.!!f*Eb .1--00:-.:.J:i

:-~~~:.:;_;

:=:-..-=:::-.:

s

a::.:;-g-=.;

:.-:-ft~~=

01_;,:.:::=."::=

-

4.,

f

- - · '

~

I

~ , u . ....

1,,..11u;.u1T L

=.:-··-

-··---....:..._

,,

Figure 7-8.

AFO-IIB Track Coupling Unit Main Assembly

~,;;,,,...._.·

6051, p. 7-25/26

OSCILLOSCOPE COHNECTION

POINT®

VERT.

2V/OIV.

OSCILLOSCOPE CON~ECTION

POINT

@

VERT. lV/OIV.

OSCILLOSCOPE CONNECTION

POINT

@

VERT. • 2V /DIV.

,.

..

I

-----...

~

• a • •

I I f •

..... r...

..

,.L.

'l

.

..

:

..

....

____

':~_

I

I

I

...

.

•

.

.

. .

J

T y r -

..

-

\.

.....

1

~

.

'

.

.

.

.

...

•

.

.

...

I •

.

..

'

..

.

•

.

-

-·

.

I,,

Ae

..

...

-·

:

..

.

-·

--

--

....

...

....

..

..

-

. . .

.

.

.

.

.

.

...

.

.

.

.

.

.

'.

9 J I I

..

-

·E

• i-

..

,

..

'

..

...

....

I-

I,,

• t:

,...

...

..

•

.

..

..

--

. .

.

...

..

..

'

.,

.

.

.

.

I

.

.... p • •

6051, p.

6-8