Troubleshooting Chart - Siemens PolyBlend PB600-4.5 Installation, Operation And Maintenance Manual

Section 1
General Information
Symptom Symptom
Motor will not start Usually caused by line trouble, such
as, single phasing at the starter.
Excessive humming g High Voltage.
Eccentric air gap.
Motor Over Heating Overload. Compare actual amps
(measured) with nameplate rating.
Single Phasing.
Improper ventilation.
Unbalanced voltage.
Rotor rubbing on stator.
Over voltage or under voltage.
Open stator winding.
Grounded winding.
Improper connections.
Bearing Over Heating g g 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.
Rotor out of balance.
Resonance.
Noise Foreign material in air gap or
ventilation openings.
Growling or whining Bad bearing.
MN400
Table 3-5 Troubleshooting Chart
Possible Causes Possible Causes
g
29
Possible Solutions Possible Solutions
Check source of power. Check overloads, fuses,
controls, etc.
Check input line connections.
Have motor serviced at local Baldor service center.
Locate and remove source of excessive friction in
motor or load.
Reduce load or replace with motor of greater capacity.
Check current at all phases (should be approximately
equal) to isolate and correct the problem.
Check external cooling fan to be sure air is moving
properly across cooling fins.
Excessive dirt build-up on motor. Clean motor.
Check voltage at all phases (should be approximately
equal) to isolate and correct the problem.
Check air gap clearance and bearings.
Tighten "Thru Bolts".
Check input voltage at each phase to motor.
Check stator resistance at all three phases for balance.
Perform dielectric test and repair as required.
Inspect all electrical connections for proper
termination, clearance, mechanical strength and
electrical continuity. Refer to motor lead 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 rotor balance checked are repaired at your
Baldor Service Center.
Tune system or contact your Baldor Service Center for
assistance.
Remove rotor and foreign material. Reinstall rotor.
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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