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What causes the DBS II FU2 fuse to blow at end of ramp up to full speed?

Issue:
What causes the DBS II FU2 fuse to blow at end of ramp up to full speed?
 
Product Line:
DBS II
 
Environment:
Models manufactured after 9/2009
 
Cause:
Cannot get startup to get through transition to bypass contactor
 
Resolution:
The FU2 5A fuse on the board set protects the circuit to the bypass contactor coil.  A blown fuse typically indicates a contactor problem including:
shorted coil
mechanical binding
 
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