Variable Frequency Drive 3

[design2003]

Can any of you make comments on the following experience that I had with <5.0 HP Variable Frequency Drive?

Supply breaker to Toshiba G7 Inverter in a crane application tripped and blew 20 amp supply fuses (all 3 -phases). The breaker is upstreams of the fuses. At the time, the drive was energized but idle (i.e input, but no output). This happened twice in one week period. I ended up replacing the G7s with an S9 drive.

Thanks.

 

[jbartos]

Suggestion: It is not clear from the original posting if any TVSSs or input reactors are being applied.