TLBI HANDLE TYPE - CIRCUITS PART 6

3. TRAIN ENTERING INTO BLOCK SECTION- AUTO TRAIN ON LINE CODE TRANSMISSION AND ACKNOWLEDGEMENT.

Step 1: Authority to proceed is given to train by LSS(Advance Stater) 'OFF' aspect. (AT STN A)

Step 2: Train enters into the block section .As soon as FVT track is occupied 1TPR drops.(AT STN A)

Step 3: With TRSR up, 1TPR down , Handle at 'L' position proved by 'LB' contact. (AT STN A)

• TOLR picks up 
• Train On Line indication 'TOLK' picks up.
• BZ1 sounds simultaneously as soon below . On hearing Buzzer LSS Control lever/Switch is made normal. However BZ1 continue till acknowledged by Station A .   

Step 4: TOLR , TOLK, and BZ1 gets strick path through TRSR, NR down and TOLR up.(AT STN A)

Step 5: Handle at L position . NR down and with TOLR up, feed automatically extended to transmitter.

Step 6: Withh TOLR up , power is connected with trasmitter.(AT STN A)

Step 7: Loop between F2 and C is completed through 'L' contact and TOLR up , modulated F2 flows to line.(AT STN A)

Step 8: Automatic TOL code F2 on line.

Step 9: Auto TOL code . F2 received by the receiver . Feed to receiver is connected through handle 'R' contact and '2R' Down. (AT STN B)

Step 10: As receiver receives F2 frequency CR2 picks up.(AT STN B)

 Step 11: With CR2 up, NR down through Handle 'RD' contact(AT STN B)

• TOLR picks up
  
• With TOLR up , TRSR and NR down TOLK and BZ1 picks up 
• TOLK up gives TOL indication.

Step 12: BZ1 continue to sound at Both Stations.(AT STN A and B)

Step 13: On Observing TOL indication and buzzer continue to sound , Station B acknowledges the Auto TOL by pressing PB1 .(AT STN B)

Step 14: On this special occasion with PB1 alone pressed through TOLR up and Handle RD contact , PBPR picks up at STN B

Step 15: With PBPR picks up at STN B , Positive On Line ,NR relays picks up at STN A.

Step 16: NR picks up causes stick path to break the TOLR ,TOLK and BZ1 circuit. Buzzer stops at Station A.(At STN A)

Step 17: Through Feed to TOLK is cut OFF , TOL indications remains as it was magnetically latched.(At STN A)

Step 18: Frequency F2 Stops

Step 19: With TOLR down feed to transmitter is cut off. Transmission of F2 gets stopped. (AT STN A)

Step 20: As F2 Stops , CR2 drops .CR2 drop cuts feed to TOLR . TOLR drops.(AT STN B)

Step 21: TOLR dropping causes feed to TOLK indication and BZ1 to cut Off .This makes buzzer to stop at STN B(AT STN B)

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.

TLBI Handle Type - Circuits Part 4

TLBI CIRCUITs:

In This lesson we will be learning about TLBI circuits.

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

1.NORMAL POSITION

- Normally  Block handle is at Line Closed Position

- SM key - IN

- SH key -IN

- S1(Normal Cancellation) and S2(Push Back Cancellation) - Normal Position

- TOL and Time release indication - White 

- Galvometer- Zero current position.

- All the relay except 1R and 1TPR are in de-energized condition

2. DISPATCHING TRAIN - Part 1

- Bell code transmission to give CALL ATTENTION from station A to Station B

Step 1: PB1 Button is Pressed(At Station A) , Negation On Line , BLR picks up and sounds the bell (At Station B)

Step 2: PB1 Button is Pressed(At Station B) , Negation On Line , BLR picks up and sounds the bell (At Station A)

Step 3: Verbal Communication for grant of Line Clear take place between SM of station A and Station B over Block Telephone.

Step 4: For Sending a train from Station A to Station B

            - TCF code transmission from Station A to Station B

            - PB1 and PB2 Pressed simultaneously (At Station A)

            - PBPR picks up proving 1R up (At station A)

            - Positive On Line (+ve On L1 and -ve on L2)

            - Galvo Deflects, NR picks up and bell sounds(At Station B)

           - With PBPR up power is connected to transmitter.(At Station A)

           - The Modulating frequency F1(85 Hz) is selected as loop between F1 

              and C is completed by Handle 'N' contact is the transmitter.(At STN A)

           - FM Code 'F1' on Line

           - Input Circuit to receiver of same station is isolated by PBPR back 

             contacts. (At STN A)

           - On Getting the Bell and Galvo deflection at STN B, SM Turns the block 

             Handle as far as Y Point. Further rotation is Not Possible as the handle
             is in locked position.(At STN B)

             - At Station B

                - Feed to receiver is connected through DY contact, 

                - CR1 picks up at station B on receipt of modulating current F1 

                  by receiver.

              - Lock Magnet picks up at Y to release the Block handle and Now 

                turned to right position('Train coming From' position)

             - While the Block Handle is being turned from Normal Position to R 

               Position, The circuit controller contact (XY-RD-LB) of the handle in the

               line circuit , in series with the relay NR is opened between the Y and 

               D points.(At STN B)

           - On Opening circuit controller contact in Line circuit, the resistance R3 

             in parallel to 'XY-RD-LB' and in series to line circuit results in reduction

             in the volume of the line current (which is greater than the line drop

             away current of NR).This cause a click on Galvo needle at both stations

             ,from this click SM of button pressing station comes to know that the

             block handle at other station has been turned.(At STN B).

          - Knowing Block Handle has been turned from the click on the Galvo 

             needle , PB1 and PB2 at station A are released.

TOKENLESS BLOCK INSTRUMENT (HANDLE TYPE) FOR SINGLE LINE - PART 3

Operation or Testing Procedure for TLBI

1. Normal Condition

- Handle in Line Close position

- SM key, SH key, S1, S2 are in Normal position.

- TOL, TRI indication - Normal

- Needle indicator - zero position

- All relay except 1R and 1TPR are in drop condition.

This condition is indicated by Signal  Normal indication LED ON

2. When A train is Leaving Station A to Station B

 1)PB1 pressed for Audio Call Signal

At Station A

- SM key- On

- PB1 - Pressed

- A DC(-ve) flow to stn B to pick up BLR at Stn B.

- At Stn A, Y Relay picks up, X Replay picks up .

- The DC Line supply B30 flows through circuits to Stn B  to Pick up BLR with returning path to Stn A to N30.

At Station B

- BLR picks up , with BLR picking up the bell rings even if the SM key is in OFF/ON.

- At Stn B , upon received of a CALL ATTENTION SIGNAL, SM key is turned ON.

- PB1 is pressed to issue an answering call to stn A.

 2)Transmission of TCF CODE & Other Station Handle Go to N to R.

- At Station A, 

- PB1 an PB2 button Pressed together.

- PBPR  Relay - Picks up

- X, Y Relay - Picks up

- With PBPR picks up, Line current Flow through terminal (25, 26) to Stn B to picks up NR relay with returning path to Stn A.

- With NR picks up a bell rings at Stn B.

- BLR doesn't picks up as current flow in opposite direction.

- As PBPR picks up at Stn A, A Voltage applied to FM Transmitter , As RB(1 & 2) are shorted for Normal R handle position making Coupler Pin 5 & 6 of Tx shorted, it generates a modulated signal F1(85 Hz) as per its internal circuitry and flows to stn B to terminal (34,24) and (37, 27) via VF transformer. 

- On receipt of the modulated signal at Stn B, Handle turned to Y position to feed DC voltage to receiver , thus giving Receiver output to pick up CR1 Relay 

With CR1 & NR picking up at Stn B, LOCK MAGNET COIL is energized ,thus LOCK magnet is released enabling the Handle to rotate from N to R(TCF).

When BLOCK HANDLE is being turned from N to R

  - RB(33,34) is open at Y position 

  - And a Resistance R5(470 ohms ) is added in the circuit resulting a reduction in the line current.

  - This causes the Galvonometer to show flick making it possible to know at Stn A that Block 

    Handle has been turned to R at Stn B.

  - Then PB1 and PB2 at Stn A may be released causing CR1 to drop at Stn B.

 3)Transmission of TGT CODE & Other Station Handle Go to N to L.

At Stn B,

- Galvo is at Zero position

- PB1 and PB2 pressed together to send signal code to stn A.

- X and Y Relays and PBPR relays picks up at Stn B

- NR picks up at Stn A.

- As PBPR picks up at Stn B, A Voltage applied to FM Transmitter ,As BLOCK HANDLE is already in R- Position, RB(1 & 2) are shorted making Coupler Pin 5 & 7 of Tx shorted, it generates a modulated signal F2(65 Hz) and flows to Stn A to terminal (34,24) and (37, 27) via VF transformer. 

- On receipt of the modulated signal at Stn A at Pin 1 through terminal 34 and Pin 2 through terminal 37, Handle turned to X position to feed DC voltage to receiver (Pin 3) , thus giving Receiver output to pick up CR2 Relay 

- When CR2 picks up, TRSR picks up.

- As TRSR picks up, LOCK MAGNET COIL get voltages and BLOCK HANDLE turned to X' position from X position allowing TRSR relay to stick through its own contact .

- With TRSR and CR2 picking up handle can be turned to L (TGT) position.

- Confirming for Galvanometer flick at Stn B.

- PB1 and PB2 may be released from Stn A.

TOKENLESS BLOCK INSTRUMENT (HANDLE TYPE) FOR SINGLE LINE - PART 2

Relay Nomenclature:

Tokenless Block Instrument (Handle Type) for Single Line - Part 1

HANDLE TYPE TOKENLESS BLOCK INSTRUMENT 
FOR SINGLE LINE IRS SPECIFICATION NO. IRS-S-98-2001

Before we start TLBI Handle Type , We Should Know the Disadvantage Of Single line Token instrument over TLBI OR Need of TLBI in signal Line.

1. Tokens are to be exchanged between Station staff and Train driver.
2. This required more operating time when train is already standing inn the station, because tokens has to be collected from the incoming train and then put that token into the block instrument for closing the block section and to take fresh line clear and token.
3. More physical strain  as token are to be exchanged.
4. Problem like token missing , token balancing etc frequently encountered.
5. Unwanted detentions because of token system.
6. Less section capacity.

Introduction :

- The Signal Standards Committee in the 29th Report recommended the introduction of Tokenless working on the Indian Railways to increase the single line capacity and the same was accepted by the Railway Board.

-  The first pair of Tokenless instruments supplied by the Diado Signal Company of Japan was introduced in 1959-60 on the Khurda Road - Ratang Section of the South Eastern Railway(Presently East Cost Railway). 

- The Last Stop Signal is Authority to proceed with TLBI.

- DC Current or Voltage are not used for signalling to the other station by TLBI to avoid other interference by extraneous currents.

- TLBI uses Modulated Carrier frequencies for Setting the instrument to TGT, TCF, TOL and Line Closed Condition.

- Transmitter and Receiver are used to transmit or receive carrier frequency .

- The instruments are designed to work either on 1800 Hz or 2700 Hz Carrier frequencies.  The Modulating frequencies are 85 Hz and 65 Hz and these are common for all the instruments.


COMPONENTS OF TLBI: