Brian and Edison, let me backup. This motor has been on this press for 20 years. It originally had a 120vdc power supply feeding the ABB drive. We had a few problems with terminals on power supply getting hot. About 8 years ago they had me install an upgrade to the 140vdc power supply. So my...
That is what I was getting 2.8 ohms. He said that the 140vdc is what was causing the high current. Have 30 amp fuses on field supply. Field was pulling 51 amps. Motor is a siemens 1GG6206-0ZZ90-6jV1-Z.
The field was burnt. Had an ohm reading, But was not correct. They rewound the field and installed new brushes. They have the motor back at their shop. He said that the 140vdc field power was to high.
We have a 180kw siemens motor. The tag on the motor has 90vdc at 27 amps for the field. The power supply for the field voltage is 140vdc. Getting 138vdc at the motor. We have been running this way for years, but we just had the motor at a shop and now the field is drawing high current, 51 amps...
