Yale MPB040-E, Manual

Page: 126 / 130

Troubleshooting
PROBLEM POSSIBLE CAUSE PROCEDURE OR ACTION
Heavy streaks and fine grooves
(see Table 2). Operation in a dirty or abrasive en-
vironment. Clean commutator more fre-
quently.
Continuous operation of motor with
a light load. Increase load on motor from time
to time.
Brush pressure is too low. Increase brush pressure.
Worn brushes. Replace brushes.
Grooves and lines following heavy
streaks. The armature must be re-
placed or the brushes will wear rap-
idly (see Table 2). Operation in a dirty or abrasive en-
vironment. Clean commutator more fre-
quently.
Continuous operation of motor with
a light load. Increase load on motor from time
to time.
Brush pressure is too low. Increase brush pressure.
Worn brushes. Replace brushes.
Grooves the width of the brushes
(see Table 2). Operation in a dirty or abrasive en-
vironment. Clean commutator more fre-
quently.
Wrong type of brushes for this mo-
tor and operation. Replace brushes with correct type.
Brush pressure is too high. Adjust brush pressure.
Copper drag occurs when copper
from the commutator is pulled into
the slot between the commutator
bars. This problem will cause a
short circuit between the commuta-
tor bars (see Table 2). Operation in a dirty or abrasive en-
vironment. Clean commutator more fre-
quently.
Brush holder is not correctly adjus-
ted electrically for the motor. Adjust brush holder.
Wrong type of brushes for this mo-
tor and operation. Replace brushes with correct type.
Brush pressure is incorrect (too
high or too low). Adjust brush pressure.
Troubleshooting 0620 YRM 0294
28