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Service
3ADW000195R0501 DCS800 Service Manual e e
DC-Motor neutral zone adjustment
Types concerned
DC-Motors
Summary
Procedure to adjust the neural zone of a DC-motor
General
Loosen the bolts holding the brush bridge.
Connect a scope or a voltmeter between two adjacent brush-holder assemblies
(holders with different polarity).
Set the scaling on the scope or voltmeter to mV AC.
Disconnect the excitation cables and connect 110 – 240 VAC between F+ and
F- (a normal extension cord is sufficient).
Start moving the brush bridge slowly in one direction and watch the scope or
voltmeter. If the voltage is increasing move the brush bridge in the other
direction.
Try to get the voltage down to less than 50 mV AC. The smaller the better.
When this is achieved, start tightening the brush bridge bolts and watch the
voltage. Sometimes you have to do a little offset to compensate for movements
during tightening.
Finally, mark the correct neutral zone position in case the motor will be taken
apart in the future.
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