Seepex BW 10, Operating And Maintenance Instructions Manual

Page: 77 / 186

Section 1
General Information
3 ‐ 4 Maintenance & Troubleshooting MN400
Table 3 ‐ 5 Troubleshooting Chart
Symptom Possible Causes Possible Solutions
Motor will not start Usually caused by line trouble, such
as, single phasing at the starter. Check source of power. Check overloads, fuses,
controls, etc.
Excessive humming High Voltage. Check input line connections.
Eccentric air gap. Have motor serviced at local Baldor service center.
Motor Over Heating Overload. Compare actual amps
(measured) with nameplate rating. Locate and remove source of excessive friction in
motor or load.
Reduce load or replace with motor of greater capacity.
Single Phasing. Check current at all phases (should be approximately
equal) to isolate and correct the problem.
Improper ventilation. Check external cooling fan to be sure air is moving
properly across cooling fins.
Excessive dirt build
‐ up on motor. Clean motor.
Unbalanced voltage. Check voltage at all phases (should be approximately
equal) to isolate and correct the problem.
Rotor rubbing on stator. Check air gap clearance and bearings.
Tighten “Thru Bolts”.
Over voltage or under voltage. Check input voltage at each phase to motor.
Open stator winding. Check stator resistance at all three phases for
balance.
Grounded winding. Perform dielectric test and repair as required.
Improper connections. Inspect all electrical connections for proper
termination, clearance, mechanical strength and
electrical continuity. Refer to motor lead connection
diagram.
Bearing Over Heating Misalignment. Check and align motor and driven equipment.
Excessive belt tension. Reduce belt tension to proper point for load.
Excessive end thrust. Reduce the end thrust from driven machine.
Excessive grease in bearing. Remove grease until cavity is approximately 3 /
4
filled.
Insufficient grease in bearing. Add grease until cavity is approximately 3 /
4
filled.
Dirt in bearing. Clean bearing cavity and bearing. Repack with correct
grease until cavity is approximately
3 /
4
filled.
Vibration Misalignment. Check and align motor and driven equipment.
Rubbing between rotating parts and
stationary parts. Isolate and eliminate cause of rubbing.
Rotor out of balance. Have rotor balance checked are repaired at your
Baldor Service Center.
Resonance. Tune system or contact your Baldor Service Center
for assistance.
Noise Foreign material in air gap or
ventilation openings. Remove rotor and foreign material. Reinstall rotor.
Check insulation integrity. Clean ventilation openings.
Growling or whining Bad bearing. Replace bearing. Clean all grease from cavity and
new bearing. Repack with correct grease until cavity
is approximately
3 /
4
filled.