Compressor Overcurrent (Terminal Relay Operation)

What does UA mean?

The compressor has experienced an overcurrent condition, specifically detected via the terminal relay. This indicates an electrical overload or fault related to the compressor's power circuit or the relay itself.

1. 1

   Measure compressor running current on all three phases using a clamp meter — compare to nameplate FLA.

2. 2

   Inspect the compressor terminal relay for signs of damage, overheating, or pitting on its contacts.

3. 3

   Check for loose connections at the compressor terminals and at the terminal relay itself.