Yes there is a DC drive 480vac 3 ph to 0-500DC output going to 250HP DC motor.
1) I will try to figure out how. Delta to Wye no ground.
2) The wye side secondary is NOT grounded
3) we have looked at the output of the Drive and the wave does not seem to have harmonics. As a matter of fact what...
Megged out winding on both pri and sec both were perfect. Pri and sec were open and 0 to ground all legs.
motor windings megged out the same as should be around 40mohms across the armatures to ground.
We believe possible fault maybe comming from the Drive, we have an older relience MAXPac...
We have burned up two 330kva Isolation Delt-Wye 480v transformers. Both transformers had the same primary winding burn up and all other windings were fine. We notice that the xformers would get really hot and then at time run normal temps, the heat was only on the phase a transformer and only...
