Reflash Instructions - Baldor MN605 Installation And Operating Manual

Symptom Possible Causes
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.

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.
MN605
Table 3-6 Troubleshooting Chart
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 3/4 filled.
Add grease until cavity is approximately 3/4 filled.
Clean bearing cavity and bearing. Repack with correct grease until cavity is approximately 3/4 filled.
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 3/4 filled.
DC Generator Connection Diagram
Compound Wound Short Shunt Connection
Shunt Fields
COMM Field
ARM
Shown for CCW (counterclockwise) rotation, (viewed from opposite drive end or
commutator end). For CW (clockwise) rotation, interchange leads A1 and A2.
Series Field
3-7