Combined Indication & control panel

RRI-Free wired Route Setting

Indian Railway Signalling Network Rail Railway Signalling Diagrams

Combined Indication & control panel, RRI-Free wired Route Setting,Station Layout,Point setting and locking sequence,Availability of selected route,Route Lock relays,RLR/NLR circuit,Route controls are mainly three types,Opposing Locking,Point Selection,Route initiation circuit, Relays in point control,Point status,Points called to the required position,Point control and detection circuits

RRI-Free wired Route Setting

Combined Indication & control panel

Combined Indication & control panel

 

Station Layout

Station Layout

Point setting and locking sequence

Point setting and locking sequence

Availability of selected route

Control table specifies the controls required for route setting Generally when route is initiated the following checks are made to confirm that the selected route is free to be called.

Checks-

Points including overlap and flank points are either already set to the required position or free.

Directly opposing route not set.

Conflicting routes are not initiated.

Other routes of the same signal are not initiated.

Any other special conditions required.

 

Route Lock relays

Each route is provided with a pair of route lock relays NLR/RLR

NLR is a magnetically latched relay(BR935) –

It is having two windings.

When route is released PU winding gets feed and relay picks up.

It gets latched in even after the feed is disconnected.

This is the normal condition and indicates the route is free

When route is initiated the other winding gets feed and the relay gets de-latched.

This prevents any other conflicting or directly opposing routes are being set. RLR is a neutral relay

RLR is a neutral relay, normally de-energised

Energises when the route is set.

De-energises when the route is released either by normalisation of route e or by TORR.

 

RLR/NLR circuit

Each circuit comprises two parts

Left side of the coil called positive path

Right side of the coil called negative path

Push button commands (S)R & (D)R etc. are proved on positive path

All route controls and special conditions are proved on the negative path

Route controls are mainly three types –

Opposing Locking – opposing routes with same setting points. Front contacts of opposing routes and front contacts of opposing USR of route section past the signal are proved.

Point Selection  – all points in the route including flank points and points in overlap are either already set to the required position or free to move. other routes starting from the same signal are not locked out.

 

Route initiation circuit

Route initiation circuit

Route initiation circuit

 

Relays in point control

Relay Description
Point NLR Normal Point Lock Relay.  Magnetically latched relay BR935.  point RLR to be de-latched first for latching NLR. When latched calls the point for Normal operation.
Point RLR Reverse Point Lock Relay.  Magnetically latched relay BR935.  point NLR to be de-latched first for latching RLR. When latched calls the point for Reverse operation.
WZR ↓ Points free relay. Slow to release relay BR934. Must be energised to unlatch point NLR and point RLR. De-energised whenever the points are called by route or individual point relay.
NKLPR Points set, Locked and detected Normal
RKLPR Points set, Locked and detected Reverse
NZLPR Points set Normal or free to be set.
RZLPR Points set Reverse or free to be set.
NWKR Points set and detected Normal.
RWKR Points set and detected Reverse.

 

Point status

Points normal or free

Points reverse or free

Points normal and locked

Points reverse and locked

Point status

Points called to the required position

Points called to the required position

Point control and detection circuits

Point control and detection circuits


 

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