GETTING STARTED WITH ROUTE RELAY INTERLOCKING - PART 5

BUTTON CIRCUIT

2) UNR AND UNCR CIRCUIT

- Full Form: Route button Relay and Route Button Checking Relay

- UNCR is normally an energised relay provided that no Route button is in  
  pressed condition(All route button are normal) . UNCR सामान्य रूप से एक एनर्जेटिक
  रिले है, बशर्ते कि कोई रूट बटन दबाए स्थिति में न हो /

- Whenever any route Button UN is pressed then UNCR dropped.
   जब भी कोई रूट बटन UN दबाया जाता है तो UNCR गिरा दिया जाता है।

- Take an example that we pressed Route button number D-6 then the flow of 
   current is shown below.

- Normally UNR -> Dropped 

- When UN    -> Pressed 
           UNR  -> Energises, Provided that the following condition are meet:-

• No Route button is in pressed condition
• SM's Key is IN( i.e SMR picked up condition)
• No point button is in pressed condition (i.e WNCR picked up condition)