ptonsparky
Tom
- Occupation
- EC - retired
Just a heads up.
Customer called to complain his replacement VFD was tripping the Pushmatic breaker. We had put in a larger breaker when the previous drive was first installed. Well, turns out the previous drive only had to be sized about twice up for single phase input. New one requires four times up. This drive input is rated at 68 amps three phase. We only have a 70 amp single phase service to the building. It is what it is for the moment.
Tech support says new models have smaller capacitors so they have to be upsized 3-4 times vs the 2 it used to be.
Customer called to complain his replacement VFD was tripping the Pushmatic breaker. We had put in a larger breaker when the previous drive was first installed. Well, turns out the previous drive only had to be sized about twice up for single phase input. New one requires four times up. This drive input is rated at 68 amps three phase. We only have a 70 amp single phase service to the building. It is what it is for the moment.
Tech support says new models have smaller capacitors so they have to be upsized 3-4 times vs the 2 it used to be.