RRI LAYOUT WITH ALL BUTTONS FOR SIGNALS POINTS & ROUTES
SIGNAL BUTTON CIRCUIT
Any button pressed, the concerned signal button relay will pick up providing all other buttons relays are dropped and no button remain pressed.
ROUTE BUTTON CIRCUIT
Required route button is pressed to energize the route button relay
POINT BUTTON CIRCUIT
When the point button WN is pressed concerned WR will pick up proving all other point buttons are normal.
COMMON GROUP BUTTONS CIRCUITS
NNR is a normally energized relay and proves that the signal is at `ON’ and normal.
* NRR picks up through conf. NNR’s pick up and GNRR(GNR) & UNR pick up. The button relay contacts are bypassed with its own pick up contact.
* On the negative side it picks up through EGGNR drop contact bypassed by GNRR drop contact. The sequential route release relay UYR2/UYR3/UYR4 drop is also proved on the negative side.
* NRR drops as soon as train passes the signal and UYRs pick up or when GN & EGGN button are pressed simultaneously to pick up GNRR & EGGNR to cancel the signal .
All this NRR’s of all signals and overlap are used to pick up concerned point NLR/RLR relays for operating of points to the required position as per the signal Route.
Every point will have one NLR and RLR each.
NLR and RLR are numbered with concerned point No. and they pick up WNR or WRR which in turn initiates point control and operates the point to normal or reverse respectively.
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