tryoung
Plastic
- Joined
- May 10, 2010
- Location
- Oklahoma USA
i was using a 7.5 hp RPC to run my 5 hp 3 phase table saw. I acquired a 7.5 hp 3 phase radial arm saw. When I first tried to start it using the RPC, the contactor in the motor starter sparked and chattered. I replaced the contactor, and the saw motor started, but slowly.However, there was no sparking or chattering from the contactor. I decided I needed a bigger RPC, so I built and tuned a 10 hp RPC. Now when I try to start the saw, the contactor that worked before sparks and chatters. I tried a different motor starter rated for 7.5 hp 3 phase, but that contactor sparks and chatters as well. So, the question is, do I need a contactor with a higher amp rating? Or is this a problem possibly related to the RPC? I'm really stuck on this one. Thanks in advance for the help.