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ALr 39 – How the 'Grace Time – Lockout Time' alarm works

When the SCS Controller is not connected to an application within the Run – Lockout Time period, and a subsequent keypad password entry grants a grace period that also expires without an application connection, the controller turns off all outputs and triggers an ALr 39 alarm.

What happened?

This alarm occurs in two stages:

  • The controller was not connected to an application within the Run – Lockout Time period, triggering an ALr 38 alarm and shutting off all outputs.
  • The controller was then reactivated via a keypad password, which started an additional grace period (the Grace – Lockout Time).

The controller was still not connected to an application before the grace period expired — so all outputs have been turned off again.

Possible causes and actions

  • The controller has reached the end of its Grace – Lockout Time without receiving a connection from an SCS application. As a result, the controller has turned off all outputs.
  • Connect to the controller using any SCS application (such as Field or Track) to reset the timer and restart normal operation.

Note: Unlike ALr 38, there is no further keypad-based grace period available at this stage. An application connection is required to restore operation.

When the SCS Controller is not connected to an application within the Run – Lockout Time period, and a subsequent keypad password entry grants a grace period that also expires without an application connection, the controller turns off all outputs and triggers an ALr 39 alarm.