Troubleshooting

Trouble

Cause

Remedy

 

 

 

 

 

Check power at starter. Correct any bad connections between the

 

 

control apparatus and the motor.

 

 

 

 

Power not available at motor terminals

Check starter contacts and control circuit. Reset overloads, close

 

contacts, reset tripped switches or replace failed control switches.

 

 

 

 

 

 

 

If power is not on all leads at starter, make sure overload and short

 

 

circuit devices are in proper condition

 

 

 

Motor will not start

Wrong connections

Check motor and control connections against wiring diagrams.

 

Low voltage

Check nameplate voltage against power supply. Check voltage at

 

motor terminals.

 

 

 

 

 

 

Open circuit in motor winding

Check stator windings for open circuits.

 

 

 

 

Motor or fan drive stuck

Disconnect motor from load and check motor and fan drive for cause

 

of problem.

 

 

 

 

 

 

Rotor defective

Look for broken bars or rings.

 

 

 

 

Motor running single-phase

Check motor and attempt to start it. Motor will not start if single-

 

phased. Check wiring, controls and motor.

 

 

 

 

 

 

Motor leads connected incorrectly

Check motor connections against wiring diagram on motor.

 

 

 

 

Bad bearings

Check lubrication. Replace bad bearings.

Unusual motor noise

 

 

Electrical unbalance

Check voltages and currents of all three lines. Correct if required.

 

 

 

 

 

Air gap not uniform

Check and correct bracket fits or bearing.

 

 

 

 

Rotor unbalance

Rebalance

 

 

 

 

Cooling fan hitting end belt guard

Reinstall or replace fan.

 

 

 

 

Wrong voltage or unbalanced voltage

Check voltage and current of all three lines against nameplate values.

 

 

 

 

Overload

Check fan blade pitch. See Fan User Manual. Check for drag in fan

 

drivetrain as from damaged bearings.

 

 

 

 

 

 

Wrong motor RPM

Check nameplate against power supply. Check RPM of motor and drive

 

ratio.

 

 

 

 

 

 

Bearing overgreased

Remove bearing reliefs. Run motor up to speed to purge excessive

 

grease.

 

 

 

 

 

 

Wrong lubricant in bearings

Change to proper lubricant. See motor manufacturer's instructions.

 

 

 

 

One phase open

Stop motor and attempt to start it. Motor will not stat if single-phased.

 

Check wiring, controls and motor.

 

 

Motor runs hot

 

 

Poor ventilation

Clean motor and check ventilation openings. Allow ample ventilation

 

 

around motor.

 

 

 

 

 

 

Winding fault

Check with ohmmeter.

 

 

 

 

Bent motor shaft

Straighten or replace shaft.

 

 

 

 

Insufficient grease

Remove plugs and regrease bearings.

 

 

 

 

 

Limit cumulative accelerations time to a total of 30 seconds/hour. Set

 

Too frequent starting or speed changes

on/off or speed change set points farther apart. Consider installing a

 

 

Marley VFD drive for fine temperature control.

 

 

 

 

Deterioration of grease or foreign material in grease

Flush bearings and relubricate.

 

 

 

 

Bearings damaged

Replace bearings.

 

 

 

 

Voltage too low at motor terminals because of line

Check transformer and setting of taps. Use higher voltage on

 

transformer terminals or reduce loads. Increase wire size or reduce

Motor does not come up to

drop

inertia.

speed

 

 

 

Broken rotor bars

Look for cracks near the rings. A new rotor may be required. Have

 

 

motor service person check motor.

 

 

 

 

 

Wrong motor rotation

Wrong sequence of phases

Switch any two of the three motor leads.

 

 

 

32

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SPX Cooling Technologies Marley MH Fluid Cooler user manual Troubleshooting, Trouble Cause Remedy
Page 31 Page 33

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