11-11-2013, 08:40 PM
Hi Ted, I did do some so I'll see if I still have them, if not some of the other guys may have them.
Basically on my system you have a 240 to 415 V autotransformer. This feeds phases A & B of the motor. The 415v overwind is continued to 650v or so and feeds a cap that feeds phase C of the motor.
It is normal to have start and run switching of the cap bank and a "balancer" motor helps if available.
There were commercial versions of this available that used a bank of caps and switched them via contactors and a voltage comparator that looked for voltage balance on all 3 phases,.
Ed
Basically on my system you have a 240 to 415 V autotransformer. This feeds phases A & B of the motor. The 415v overwind is continued to 650v or so and feeds a cap that feeds phase C of the motor.
It is normal to have start and run switching of the cap bank and a "balancer" motor helps if available.
There were commercial versions of this available that used a bank of caps and switched them via contactors and a voltage comparator that looked for voltage balance on all 3 phases,.
Ed
