How to balance voltage on 3 phase?
OK, I finally got the phase converter running. Had the 110v leads hooked up to the wrong wires. I'm currently reading the following voltages:
Lead 111 to 112 = 241 volts
Lead 112 to 113 = 211 volts
Lead 111 to 113 = 224 volts
My CNC calls for 230 volts, so how do I balance these out so the CNC works properly???
I had to connect the 110volt leads to 111 and 112 wires. Now that the phase converter is putting out the higher voltages do I then come off these three leads #'s 111,112 & 113 to feed the machine? I know this sounds dumb, but I had to ask. Do I use caps to adjust the voltages so they are all the same and I've read somewhere about one of the legs being like nutural(for lack of the proper word) and how do I know which one that is? Are there any special ways the three leads get attached to the machine?
I know these all sound dumb, but I have no expereince in phase converters or using three phase.
ben
Use oil filled run capasitors.
Put the capasitors between the two powered legs and the 3rd generated leg. look on this site for several plans showing where to connect them and the starting values for your application. the desired result is to be within 10% on all legs.
balancing my phase converter
Hi All,
Powertoolman (Rick)
I have also built a 20 hp phase converter and have it starting and running but my voltages are way off. L1= 120 volts to ground, L2= 121 vtg, and L3= 240 vtg. Also the idler motor starts very loud and vibrates stuff off shelves. I hooked up the idler according to the nameplate for 220 V i.e. L1 connected to motor wires 1-7-6, L2 to 2-8-4, and L3 to 3-9-5. One article I found said to hook op the idler differently. Please Help!
balancing my phase converter
Thanks Al
Well that didn't work. I was not able to read voltage because the motor made such a loud noise I shut it down. I'm thinking that perhaps I have a bad motor. I bought it from a reputable dealer so I wonder if maybe it was re- wound in the past. Also the voltages that I noted earlier are consistent if you go phase to phase. Phase 1-2 =241, 1-3 = 351, 2-3 =350.
Thanks
Chris