TLBI HANDLE TYPE - CIRCUITS PART 5

TLBI CIRCUITs:

In This lesson we will be learning about TLBI circuits number 2- Part 2

1. NORMAL POSITION
2. DISPATCHING TRAIN
3. TRAIN ENTERING INTO BLOCK SECTION- AUTO TRAIN ON LINE CODE TRANSMISSION.
4. TRAIN ARRIVAL
5. NORMALIZING OF BLOCK SECTION
6. NORMAL LC CANCELLATION
7. PUSHBACK LC CANCELLATION
8. TELEPHONE CIRCUIT
9. SPECIAL CIRCUIT ARRANGEMENT

2. DISPATCHING TRAIN - Part 2

Step 1 : With Handle at TCF position PB1 and PB2 pressed. Simultaneously to send TGT code a

             code of signal to Station A (AT STN B)

Step 2: PBPR picks up(AT STN B)

Step 3: Positive on Line 1 and Negative on Line 2

Step 4: Galvo deflects , NR picks up and bell sounds.(At STN A)

Step 5: With PBPR up, power is connected to transmitter as shown below.(AT STN B)

Step 6: The modulated frequency F2 (65 Hz) is selected as loop between F2 and C is completed through handle 'R' contact and 2R back contact in the transmitter.(AT STN B)

Step 7: With NR up and F2 is received at receiver input.(At STN A)

Step 8  : FM code F2 on line , with DC.

Step 9: On getting the bell and Galvo deflection at STN B, SM turns the block handle up to X position, further turning is not possible as the handle is in locked position.(AT STN A)

Step 10: Feed to receiver through handle BX contact , SM key IN, 1R up, PBPR and TOLR down is extended as shown below.(AT STN A)

Step 10: CR2 picks up at STN A on receipt of F2 by the receiver.(AT STN A)

Step 11: With NR, CR2 and 1TPR up, handle at XX' contact , TRSR picks up , which is the Line clear receiving relay.(AT STN A)

Step 12: Lock Magnet picks up with TRSR , CR2 and NR up to release the block handle.(AT STN A)

Step 13: Block Handle turned to check lock position at X' and then to Train Going To Position(continuous co operation is required to pass check lock position).(AT STN A)

Step 14: Galvo needle flicks at both stations as line current reduces due to current flow through R3 during the circuit controller contact (XY-RD-LB) of the handle opening between X and B points.
(AT STN A)

Step 15: Galvo flicks . Knowing block handle has been turned from the Galvo needle flick, PB1 and PB2 at station are released.(AT STN B)

Step 16: TRSR up and with Block handle contact 'LA' proving that the handle is in L position Advance starter controlling relay ASR picks up. ASR up LSS can be taken OFF.