Bpac With Mux For Iriset07

BLOCK PROVING BY AXLE COUNTER WITH MUX-COMBINER

Central Electronics Limited

BPAC with Mux-Combiner 

Specification: Approved by RDSO 1. 2.



RDSO Drg No. S32001 for Double Line 1990 RDSO Drg No. S32010 for Single Line

2000

System Requirement: 1. 2. 3. 4. 5. 6.

1 ½ PET Quad cable between stations 4/6 Quad cable to Adv and Home locations. 24V DC N power R supply. N R Advance , & Home , lever connections. Q type, 24V relays (QNA1, QNN1, QL1 type). 3RL track circuit for D/L & 5RL track circuit for S/L. for trolley suppression.

2

BPAC with Mux-Combiner

(Contd …)

Equipment details:

 S. No.

Name of the Equipment

Qty for S/L

Qty for D/L

1.

SM’s Panel

2 Nos.

2 Nos.

2.

Axle Counter (ACS-55, 2D) 4/2 wire EJB 4/4 wire EJB

1 No.

2 Nos.

1 No. 1 No.

2 Nos. 2 Nos.

3.

Relay Rack

2 Nos.

2 Nos.

4

i. Tx-Mux ii. Rx-Mux iii. Combinerconverter

2 Nos. 2 Nos. 2 Nos.

2 Nos. 2 Nos. 2 Nos.

Function

Provides controls and indications for block operation Monitors UP/DN lines for occupancy. Combines channel A & B of axle counter at advance. Standard EJB used at home locations. Houses Tx-Mux, Rx-Mux, combiner-converter & interlocking relays. Transmits and receives block relay information from Station A to B and vice versa. Interface equipment between PET Quad cable & Tx-Mux, Rx-Mux & 4/2 wire.

3

BPAC with Mux-Combiner-Yard Layout (S/L)

4

BPAC with Mux-Combiner-Yard Layout (D/L)

5

BPAC with Mux-Combiner-System View

6

BPAC with Mux-Combiner

(Contd …)

Universal Axle Counter:   

RDSO specification – IRS S-42/85. Models available – 2D/3D/4D. Section length to be used (max) – 15 km. (20 dB loss)

Features:    

Track devices operating frequency at 5 KHz (Tx, Rx Coils). 210 Bit counter (1024 counts). EVR, SUPR drive for QS3, 12V, 1000 ohm relays. Modular design.

System suitable for block section

-

2D

If 3D/4D system is available, it has to be converted into 2D model before use in block section. If not converted, the floating LSTTL input of E/F and G/H channels of 3D/4D are likely to receive noise and system may have random failure. 7

BPAC with Mux-Combiner

(Contd …)

Multiplexer: Designed as per technical requirement given in RDSO Drg No. S32001. Block Section length to be used (Max) – 12 Km.





Features: Time Division Multiplexer (TDM). 12 Channel multiplexer. Dual clock circuits in synchronization used for

v. vi. vii.  

viii.

Packet formation in Tx-Mux. Packet verification in Rx-Mux.

Odd parity checking.

Note: Number of channels used in S/L -

D/L - 7 channels. 7 channels. 8

BPAC with Mux-Combiner

(Contd …)

Modem Signal Levels: Modem IC’s used: XR-2206: Modulator IC



Recommended Transmit level



-

3V p-p

-

10mV rms. to 3V. > 200mV (as per

XR-2211: Demodulator IC

  

S. No.

Recommended input signal level Composite input level manual)

1.

Gain in Combinerconverter card (Card2) Normal Card

2.

High Gain Card

Transmit Signal in dB (At Station -1.76 A)

Line 12 Kms

Receive Signal in dB (At -10.20 Station B)

3.62

12 Kms

-4.80

9

BPAC with Mux-Combiner

(Contd …)

Improvements: Improvement for reliability of axle counter and axle counter block system was carried out as per Dr. Vinod Chandra, Prof. IIT Delhi & RDSO’s recommendation dated 08.01.1998 STS/E/AC/Consultancy.

A. Multiplexer: Status 5.

Modification in relay driver (RD) card 1999

- improved RD provided -

2. 3.

11.

Year

2003 Provision of push button repeater relays

FET based new RD provided

Provision of attenuator pad at the input with 2 of combiner-converter . provided Replacement of push buttons with dust buttons free push buttons on SM’s panel

TGTNR & BPNR provided attenuator Position -

Siemens provided 10

BPAC with Mux-Combiner

(Contd …)

Improvements (Contd …): B. Axle Counters Status Carried out in

Increase of clock signal from 2KHz to 10KHz card6 5. Increase of RD voltage from 8V dc to 11V dc carried out in card9 minimum. 3. Provision of module type DC-DC converter at provided at th 10 card. 10th slot instead of chasis type. 9. Provision of MOV’s in EJB & Evaluator cards provided 10. Indication of oscillator output in EJB - provided in card1 11. Provision of Euro connectors in EJB - provided In addition to the above the universal axle counter design has been modified in the year 2002 to include m. Preparatory reset n. First out-count reset circuit 11 o. Channel level proving circuit p. Additional filter in trolley suppression circuit. 4.

BPAC with Mux-Combiner Universal axle counter selection/dummy cards: S. No. 1.

4D

(Contd …)

to

2D

conversion

by

jumper

2D (System after conversion) Normal

Card No.

4D (System Available)

Modification to be carried out

Card 1

Normal

Nil

2.

Card 2

Normal

Card 2 to be removed. Insert dummy card.

Dummy 2

3.

Card 3

Normal

Nil

Normal

4.

Card 4

Normal

Card 4 to be removed. Insert dummy card.

Dummy 4

5.

Card 5

Normal with jumpers J1 & J3

Card 5 to be removed. Insert dummy card.

Dummy 5

6a.

Card 6 (with prep reset)

Normal with jumpers J1, J3, J5, J7, J11 & J12

Nil

Normal with jumpers J1, J3, J5, J7, J11 & J12

6b.

Card 6 (without prep reset)

As above in 6a, connect jumper J9 & disconnect resistor R132.

Nil

As above in 6a, connect jumper J9 & disconnect resistor R132.

7.

Card 7

Normal

Nil

Normal

8.

Card 8

Nil

9.

Card 9

Normal with jumpers J1 & J3 Normal with jumpers J1, J3, J5 & J8

Normal with jumpers J1 & J3 Normal with jumpers J2, J4, J7 & J10

Remove jumpers J1, J3, J5 & J8. Connect jumpers J2, J4, J7 & J10

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BPAC with Mux-Combiner Universal axle counter selection/dummy cards: S.

3D

(Contd …)

to

2D

conversion

by

jumper

2D (System after conversion) Normal

Card No.

3D (System Available)

Work to be carried out

Card 1

Normal

Nil

2.

Card 2

Normal

Card 2 to be removed. Insert dummy card.

Dummy 2

3.

Card 3

Normal

Nil

Normal

4.

Card 4

Normal

Card 4 to be removed. Insert dummy card.

Dummy 4

5.

Card 5

Normal with jumpers J2 & J4

Card 5 to be removed. Insert dummy card.

Dummy 5

6a.

Card 6 (with prep reset)

Normal with jumpers J2, J4, J6, J8, J11 & J12

Remove jumper J2, J4, J6, J8, J11 & J12. Connect jumpers J1, J3, J5, J7, J11 & J12

Normal with jumpers J1, J3, J5, J7, J11 & J12

6b.

Card 6 (without prep reset)

As above in 6a, connect jumper J9 & disconnect resistor R132.

Nil

As above in 6a, connect jumper J9 & disconnect resistor R132.

7.

Card 7

Normal

Nil

Normal

8.

Card 8

Normal with jumpers J2 & J4

Remove jumper J2 & J4. Connect jumpers J1 & J3

Normal with jumpers J1 & J3

9.

Card 9

Normal with jumpers J1, J3, J6 & J9

Remove jumpers J1, J3, J6 & J9. Connect jumpers J2, J4, J7 & J10

Normal with jumpers J2, J4, J7 & J10

No. 1.

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