Troubleshooting Chart - Baldor Reliance CDX7150 Installation & Operating Manual

Section 1
General Information
Symptom
Motor will not start Usually caused by line trouble, such
as, single phasing at the starter.
Excessive humming High Voltage.
Loose pole pieces.
Motor Over Heating Overload. Compare actual amps
(measured) with nameplate rating.
Improper ventilation.
Armature rubbing on stator.
Field over voltage.
Full voltage on field with motor
stopped.
Grounded winding.
Improper connections.
Bearing Over Heating Misalignment.
Excessive belt tension.
Excessive end thrust.
Excessive grease in bearing.
Insufficient grease in bearing.
Dirt in bearing.
Vibration Misalignment.
Rubbing between rotating parts and
stationary parts.
Armature out of balance.
Resonance.
Noise Foreign material in air gap or
ventilation openings.
Growling or whining Bad bearing.
MN605
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Troubleshooting Chart

Table 3-6
Possible Causes Possible Solutions
Check source of power. Check overloads, fuses,
controls, etc.
Check input line connections.
Torque the bolts as specified in Table 3-1.
Locate and remove source of excessive friction in
motor or load.
Reduce load or replace with motor of greater capacity.
Check external cooling blower to be sure air is moving
properly across cooling fins.
Check blower for proper direction of rotation.
Check motor brush covers to ensure they are solid on
the commutator end and that they are not louvered.
Check filter for dirt, clean or replace.
Excessive dirt build-up on motor. Clean motor.
Check air gap clearance and bearings.
Tighten "Thru Bolts" that hold the endplates to frame.
Torque the pole bolts as specified in Table 3-1.
Check input voltage.
Reduce field voltage to 60% with field economy circuit
in the control.
Perform dielectric test and repair as required.
Inspect all electrical connections for proper
termination, clearance, mechanical strength and
electrical continuity. Refer to connection diagram.
Check and align motor and driven equipment.
Reduce belt tension to proper point for load.
Reduce the end thrust from driven machine.
Remove grease until cavity is approximately
Add grease until cavity is approximately
Clean bearing cavity and bearing. Repack with correct
grease until cavity is approximately
Check and align motor and driven equipment.
Isolate and eliminate cause of rubbing.
Have armature balance checked are repaired at your
Baldor Service Center.
Tune system or contact your Baldor Service Center for
assistance.
Remove armature and foreign material. Reinstall
armature. Check insulation integrity. Clean ventilation
openings.
Replace bearing. Clean all grease from cavity and new
bearing. Repack with correct grease until cavity is
approximately / filled.
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Maintenance & Troubleshooting 3-9
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