DC circuit breakers VS semiconductor fuses high speed.

[Ironbones]

We had a MCC panel fed by 400A BS88 fuses. Part of this panel had a 100HP GEC traction motor inverter drive. We changed the original GEC drive to a Eurodrive regenerative unit. The new unit originally had 500A semiconductor fuses. It worked fine on acceleration, the fuses blew on deceleration? We were replacing the semiconductor fuses several times during a ten hour shift, it was costing a small fortune. To keep the plant running we eventually fitted 750A semiconductor fuses (remember the incoming supply was still via 400A fuses).


There are occasions where semiconductor fuses are a damned menace, they’re too quick. Eventually I got around the problem by changing the PID deceleration algorithm.

Thanks for the reply, real time example great help.