Rockwell Automation 1325R Small DC Motors User Manual - Manual (Page 7)

Small DC Motors 7
General
The following should be checked at regular intervals:
•
Windings should be dry and free of dust, grease, oil, and dirt. Windings
may be cleaned by suction cleaners or by wiping. Nozzles on suction
type cleaners should be non-metallic. Gummy deposits of dirt and grease
may be removed by using a commercially available low volatile solvent.
Do not use gasoline or other inflammable solvents.
•
Terminal connections, assembly screws, bolts and nuts should be tight.
They may loosen if motor is not securely bolted and tends to vibrate.
•
Insulation resistance of motors in service should be checked periodically
at approximately the same temperature and humidity conditions to
determine possible deterioration of the insulation. When such
measurements at regular intervals indicate a wide variation, the cause
should be determined. Motor should be reconditioned if the motor has
been subjected to excessive moisture, or by rewinding or reinsulating if
necessary. Enclosed motors require very little attention. Be sure that
external air chamber of fan cooled motors does not become clogged with
foreign material which will restrict passage of air.
Troubleshooting If trouble develops in operation of motor, verify that:
1. The bearings are in normal condition and have been properly lubricated
with a high grade, ball bearing lubricant, free of dirt or grit. If dirt enters
bearing, flush and relubricate.
2. There is no mechanical misadjustment to prevent free rotation of moving
parts of motor and drive.
3. All bolts and nuts are properly tightened.
4. Motor instructions have been carefully carried out.
5. The rated voltage is available at the motor terminals.
6. The voltage corresponds to the value stamped on the nameplate.
7. All connections are properly made in all circuits between motor and
control.
8. The overload and low voltage devices in control equipment, fuses or
other protective devices are in proper working order.
9. Brushes are in good condition and are making good con-tact with the
commutator.
10.The commutator is clean and has smooth polished surface.
11.No excessive overload exists on the motor. Compare line amperes at full
load with nameplate stamping.
!
ATTENTION: Internal parts of this motor may be at line
voltage even when motor is not rotating. Disconnect all AC line
connections before contacting any internal part.