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what leads water chiller compressor coil burned?

what leads water chiller compressor coil burned?
Update Time:2017-09-21
Q: what leads water chiller compressor coil burned?
A: There several conditions lead water chiller compressor coil burned: Phase missing, Overload, interturn, inter-phase, 

1. phase missing
Reason: Phase missing(one phase not supply power or supply not enough power) or contactor not closed, wire connection broken, loosing or contact position oxidation;
Features: one or two phases fully turned into black of the winding, and the broken coil is symmetric and regular

 

2. Overload
Normally because the motor is running under over current, over heat,  started frequently and brake.
  Lydia