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What cause unbalance current alarm on the DBS unit?

What is current unbalance on the DBS II starter?
Issue: 
What is current unbalance on the DBS II starter?
 
Product Line:
DBS starter
 
Environment:
All units
 
Cause:
Current Unbalance alarm/fault
 
Resolution:
Current Unbalance will be activated when the Current Unbalance % exceeds the Current Unbalance level and the Current Unbalance Delay has expired
 
1). Voltage Unbalance : Check for voltage balance between phases.   Customer must consult power supply if balance is abnormal
 
2).  Abnormal SCR operation : Load balance on customer’s system must be re-distributed
 
3).  Acknowledge Trip : Verify Current unbalance and current run delay set points are adjusted properly.
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