rimcanyon
Diamond
- Joined
- Sep 28, 2002
- Location
- Salinas, CA USA
New 15 HP RPC in a new shop with 100A service, everything new. This is attached to a subpanel fed from the original garage subpanel, with #2 copper wires run about 70'. I have two problems I would appeciate some help with.
First, when the RPC is started, it blows two other circuit breakers (20A GFCI), even though there is no load on those breakers. The RPC is serviced by a 50A GFCI breaker, and that breaker has no problems. All 3 beakers are new Homeline tandem GFIC breakers (HOM 220GFIC and HOM 250GFIC). The RPC is basically a Fitch Williams design, and it evolved from a 5HP RPC that never had any issues.
Second problem: I added 1500k ohm bleed resistors to each run cap circuit (AC and BC), and both resistors blew after about 10 minutes. They went with a loud bang and really smoked the garage. No other damage was done; after removing the remnants of the resistors and the AB and start cap resistors, the phase converter runs fine. AC voltage was 289 and BC voltage was 287 originally, but I removed one 45mfd cap from each leg and now AC is 269V and BC is 267V. I must have misunderstood the articles I read that recommended bleed resistors on each capacitor leg. Can someone set me straight?
Dave
First, when the RPC is started, it blows two other circuit breakers (20A GFCI), even though there is no load on those breakers. The RPC is serviced by a 50A GFCI breaker, and that breaker has no problems. All 3 beakers are new Homeline tandem GFIC breakers (HOM 220GFIC and HOM 250GFIC). The RPC is basically a Fitch Williams design, and it evolved from a 5HP RPC that never had any issues.
Second problem: I added 1500k ohm bleed resistors to each run cap circuit (AC and BC), and both resistors blew after about 10 minutes. They went with a loud bang and really smoked the garage. No other damage was done; after removing the remnants of the resistors and the AB and start cap resistors, the phase converter runs fine. AC voltage was 289 and BC voltage was 287 originally, but I removed one 45mfd cap from each leg and now AC is 269V and BC is 267V. I must have misunderstood the articles I read that recommended bleed resistors on each capacitor leg. Can someone set me straight?
Dave