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TROUBLESHOOTING AND REPAIR | ||
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DRIVE MOTOR TEST (continued)
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To further check the drive motor:
12.Remove input power (115VAC) from the
13.Locate and remove leads #539 and #541 from the control board, see Figure F.5.
14.Locate and remove leads #626 and #627 from the relay board.
15.Using the ohmmeter, measure the resistances per Table F.3.
16.If the motor resistance test is good, proceed to the Motor Applied Voltage Test.
3.Apply field voltage first (leads #626 and #627) to the motor. Then slowly apply the armature voltage at leads #539 and #541.
4.The motor should run and the speed should vary with changes to the armature voltage.
5.If the motor does NOT run and change speed correctly, the motor or gear box may be faulty.
6.To stop the motor, remove the armature voltage first, leads #539 and #541.
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| AFTER TESTING |
MOTOR APPLIED | 1. Replace motor leads. |
VOLTAGE TEST |
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1.Carefully connect the isolated 120VDC supply (supply turned off) to motor leads #626 and #627, see
Figure F.5.
2.Carefully connect the variable 0 to 120VDC supply (supply turned off) to motor leads #539 and #541.
2.Install the screws that secure the left side cover assembly.
3.If disengaged, engage the drive rolls.
4.If removed, feed the electrode back into the wire drive unit.