Imbalance
Imbalance
(OP)
Small 120/240 Volt 3phase 5hp grinding pump that is triping on overcurrent. FLA = 13.2 Amps/phase. The utility has a
voltage imbalance of 1.8%, but the current imbalance is 28%...Can anyone explain????
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RE: Imbalance
Whenever you get a problem like this it means more energy is being dissipated somewhere and the problem is finding out where. I don't like the imbalance in the currents but under overload conditions it's not a safe evidence of a motor fault. Have you tried running the motor without the pump. That's the easiest way of eliminating one half the possible causes.
Cheers
G
RE: Imbalance
Is the voltage balance the same at the motor terminals?
Search this site for “unbalance” or “imbalance.” It has been extensively discussed here.
RE: Imbalance
RE: Imbalance
Mark Empson
http://www.lmphotonics.com
RE: Imbalance