DC Motor Trouble 1

[ProWinder]

We are working on a Westinghouse motor.
Frame 620-MCA Volts 230 DC
rise 75 Deg C Series Wound
HP 275 RPM 370 Amps 975 Hrs 1
HP 360 RPM 340 Amps 1280 Hrs 5


Looking at the com side of the motor it will run ccw and draws 150 amps
the motor will turn in the cw direction. The motor draws 500 amps.
When the power is turned off it appears that the armature turns ccw about the distance of one bar segment of the comm.
We tried switching A1 and A2 from the test panel. The motor will still only turn ccw. With A1 and A2 in the correct spot, we changed S1 and S2. The motor will now turn in the cw rotation, but not ccw.

We tried connecting the A1 and A2 test panel leads directly to the brush holders and the motor will still only rotate ccw.

We did do a polarity test of the frame. The series fields are correct. The inter poles are also correct. All the brushes are properly seated to the comm.

Any thoughts?

 

[rbulsara]

Yes, thank you for the feedback. I am glad you found the problem and fixed it.