I am building a 10HP 230V RPC. My buddy handed me 20 run caps. They are rated at 60uf 440V. It seems that the start caps should be about 720uf. This makes me think I can gang 12 of these run caps together to get 720uf. They will be soldered together in parallel with 10AWG copper wire. There is a steel enclosure that I will put them in.
Do you think 10AWG wire will do?
In reading, based on 70uf per horsepower, I think that 720uf will be OK. Any comments?
What value of resistor should I use to drain this bank of start caps? Will one large resistor work or should I use a resistor on each cap? I was thinking a single 10K at 5 or maybe 10 watts would drain the bank.
This bank of caps will be activated with a Cutler Hammer 25 amp three phase motor starting contactor. I tied all three terminals together, using 14 AWG copper wire, so that the 3 contacts would all share the load.
I will run the output of this system into my 3 phase panel with 8AWG wire.
My single phase panel will feed this RPC through a 50 amp breaker.
What say ????
THANKS in advance. I have learned a ton of quality information here at Practical Machinist.
Dan Miller
.
Do you think 10AWG wire will do?
In reading, based on 70uf per horsepower, I think that 720uf will be OK. Any comments?
What value of resistor should I use to drain this bank of start caps? Will one large resistor work or should I use a resistor on each cap? I was thinking a single 10K at 5 or maybe 10 watts would drain the bank.
This bank of caps will be activated with a Cutler Hammer 25 amp three phase motor starting contactor. I tied all three terminals together, using 14 AWG copper wire, so that the 3 contacts would all share the load.
I will run the output of this system into my 3 phase panel with 8AWG wire.
My single phase panel will feed this RPC through a 50 amp breaker.
What say ????
THANKS in advance. I have learned a ton of quality information here at Practical Machinist.
Dan Miller
.