9100
Diamond
- Joined
- Nov 1, 2004
- Location
- Webster Groves, MO
A modular 10EE with a 5 hp GE motor I look after needed a brush replaced, which we did with only minor trauma. Now as you bring the speed up running forward, it suddenly reverses, going to a similar speed in reverse. Naturally the tach doesn't work so that is an estimate. Turning the speed control down reduces that speed and around 500 RPM it switches back to forward. We had the motor pulled most of the way out of the base for other maintenance and I concluded that the mechanic who did it got the series field wires reversed, which is known to produce such behavior. Possibly the worn brush wouldn't pass enough current to cause reversal and it didn't show up before. I left the mechanic with instructions to switch S1 and S2. The customer called to say that it still malfunctioned.
I will go back in the morning but meanwhile, does anyone have a suggestion?
Bill
I will go back in the morning but meanwhile, does anyone have a suggestion?
Bill