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ALr 19 - How the 'Terminal Alarm' works

If the compressor in a cooler has run continuously for the configured time without reaching the setpoint temperature, the SCS Controller can switch off all the outputs to protect the asset and trigger an alarm (ALr 19). 

Review the fault logic for the "Terminal" or "Refrigeration Failure" alarm in the following graph:

AL19 alarm logic

Possible causes and actions

The compressor has run continuously for the configured time without reaching the setpoint temperature. There are multiple possibilities preventing the system from achieving temperature.

  1. There are two actions: