3-7
MN605
Table 3-6 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.
Loose pole pieces.
Torque the bolts as specified in Table 3-1.
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.
Improper ventilation.
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.
Armature rubbing on stator.
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.
Field over voltage.
Check input voltage.
Full voltage on field with motor stopped.
Reduce field voltage to 60% with field economy circuit in the control.
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 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.
Armature out of balance.
Have armature 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 armature and foreign material. Reinstall armature. 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.
Reflash Instructions
Instructions to reflash the residual magnetism for Lifting Magnet Generators only. These generators are self−
exciting. If voltage will not build up, it is possible the residual magnetism is insufficient to initiate excitation. This
procedure is to restore sufficient residual magnetism to self excite.
Note: Loss of residual magnetism can be caused by misconnection (reversing the connections) of F1 and F4.
1. Disconnect F1 and F4. All other leads may remain connected.
2. Connect 24 to 40VDC power source positive lead to F1 and negative to F4.
DC source may be batteries, a DC welder (not AC) or rectified AC.
3. Drive generator at rated RPM.
4. Measure the voltage across A1 and A2. Voltage should be 150 to 200% of F1 to F4 voltage. When A1 to A2
voltage level reaches this level (approximately 30 seconds) carefully remove the source leads, an arc may be
present during disconnect.
5. Stop the generator.
6. Reconnect F1 and F4 as shown in the DC Generator Connection Diagram. Rotation is viewed from opposite
drive end (commutator end) A1 is positive for CCW rotation. A2 is positive for CW rotation. S1 is always
negative.
Shown for CCW (counterclockwise) rotation, (viewed from opposite drive end or
commutator end). For CW (clockwise) rotation, interchange leads A1 and A2.
DC Generator Connection Diagram
Compound Wound Short Shunt Connection
Shunt Fields
ARM
COMM Field
Series Field
Содержание MN605
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