9.9 times out of 10, this is the result of the load on the motor being too light.
Most soft starters on the market require that the current flowing through the current sensors inside of it be at least 20-30% of the rating of the unit (varies by mfr.). That's how they determine phase loss, because they do not actually measure voltage, only current. So if AT LEAST one phase current is below that threshold, it means you have a phase loss somewhere. But if ALL 3 phases are below that threshold, the condition is still true, so it ASSUMES this is a phase loss.
You have most likely:
A) not yet connected the motor,
B) left the motor disconnect switch open
C) left a valve closed somewhere so no water is flowing and since water flow = load on a pump, the motor is unloaded and not drawing enough current to satisfy the Phase Loss trip condition.
D) a SERIOUSLY clogged filter!
I almost guarantee it...
Last edited by Jraef; 04-23-13 at 04:47 PM.
Many people are shocked when they discover I am not a good electrician...