POINT CONTROL CIRCUIT: (Combined
WLR/WNR/WRR)
A point can be operated only when,
i) The point is not engaged in Route or Overlap of any Signal i.e., WLR is up.
means Point is free and ready to operate.
ii) The Track Circuit of Point zone are free and track circuit is not failed i.e.,
ATR and BTR up.
iii) SM’s key is `in’.
Concerned LR should pick up with point button in for automatic operation. The point button should be turned to the required position (N/R) with all LRs dropped for individual operation.
NCR/RCR CIRCUIT
- A two position point button is provided with two relays,
- NCR (normal control relay) : NCR is energized for normal operation of point when point button is turned to normal.
- RCR (Reverse Control Relay) : RCR is energized for reverse operation of the point when point button is turned to reverse.
- The N and R contacts of button are bridged by SMR back contacts,
thereby point remains in last operated position when the SM locks the panel.
- Either NCR or RCR always remains in energized position till the point button is turned to the other side.
POINT LOCK RELAY(WLR)
- WLR is normally a de-energized relay. So normally the point is locked
electrically.
- During route setting, after LRs picking up WLR picks up.
- WLR relay gets energized whenever
- the point button is turned from R to N i.e.NCR energized or
- Point button turned from N to R i.e. RCR energized, provided all other conditions are satisfied.
- When the point is set and indication relay is energized, drops the WLR and
locks the point electrically.
NOTE
- WLR Route ke Point ko Lock karta hai
- See the yard diagram and try to check point 51 and 52 kis kis route k signal
me padega .
- Kiska kiska Overlap me aayega
- If sandhum is present then write it overlap example 6AOVSR .
- Normal Overlap also write .example 4/6 OVSR
- If any Shunt signal is present in starter then dont take it overlap because shunt signal ka overlap nahi hota hai.
- Overlap hota hai Home signal ka but Naming Starter ka ho jata hai.
NWR/RWR CIRCUIT and POINT OPERATION CIRCUIT, POINT INDICATION CIRCUIT AT LOCATION (WNKR/WRKR) & AT RELAY ROOM (NWKR/RWKR)
- Whenever the point button is pressed, NCR/RCR picked up, Provided SM’s key is in.
- With NCR/RCR picked up, WLR is picked up
- With WLR picked up, PCR1 picks up
4. PCR1 picked up, 110 V DC for point operation is extended to
location.
5. With WLR, RCR/NCR picked up, NWKR/RWKR drops. Thereby all
indication relays& its repeater relays (NWKPRs, RWKPRs, NWKSRs,
RWKSRs) drop.
6. With WLR up, all indication relays drop, NCR/RCR up, NWR/RWR will pick
up at location
7. With NWR/RWR picks up, WJR picks up. There by WXR picks up and
sticks with its own front contact. With WXR picking up, normal feed to
WJR removed but WJR held in pick up through time delay condenser
circuit
8. With WXR, WJR, NWR/RWR up and WNKR/WRKR drop, WCR (QBCAI
relay) picks up
9. With WCR & NWR/RWR up, 110V DC available on bus bar is extended to
point machines at A end & B end parallelly. Both points are set to Normal
or Reverse.
10. There by WNKR/WRKR picks up
11. Energisation of WNKR/WRKR results in dropping of WJR, WCR, and
NWR/RWR
12. With WJR dropping, WXR drops.
13. Due to all controlling relays (WCR, WJR, WXR, NWR, RWR) at location
dropping and WNKR/WRKR picking up, energizes indication relay
NWKR/RWKR at relay room.
14. Energisation of NWKR/RWKR results in dropping of WLR and locks the
point electrically.
15. De-energisation of WLR in turn drops PCR1 /PCR2, thereby 110V DC is
withdrawn from the location bus bar
16. In nutshell it can be concluded that point operation initiated, point
unlocked, point operated & set, all point controlling relays de-energized,
point indication obtained and point locked again.
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