SPX Cooling Technologies 98-1514E user manual Troubleshooting, Trouble Cause Remedy

Troubleshooting

Trouble	Cause	Remedy
		• Check power at starter. Correct any bad connections
		between the control apparatus and the motor.
		• Check starter contacts and control circuit. Reset overloads,
	Power not available at motor terminals	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 Geareducer
		for cause of problem.
	Rotor defectve	Look for broken bars or rings.
	Motor running single-phase	Stop 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 bell 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 Manual. Check for
		drag in fan drive train as from damaged bearings.
	Wrong motor RPM	Check nameplate against power supply. Check RPM of motor.
	Bearings overgreased	Remove grease 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 start if single-
		phased. Check wiring, controls, and motor.
Motor Runs Hot
	Dirty motor	Clean motor.
	Winding fault	Check with Ohmmeter.
	Bent motor shaft	Straighten or replace shaft.
	Insufficient grease	Remove plugs and regrease bearings.
		Limit cumulative acceleration time to a total of 30 seconds/hr.
	Too frequent starting or speed changes	Set on/off or speed change set points farther apart. Consider
		installing a Marley VFD drive for fine temperature control.
	Deterioration of grease, or foreign	Flush bearings and relubricate.
	material in grease
	Bearings damaged	Replace bearings.
	Voltage too low at motor terminals	Check transformer and setting of taps. Use higher voltage on
		transformer terminals or reduce loads. Increase wire size or
Motor Does Not Come Up	because of line drop
		reduce inertia.
To Speed
	Broken Rotor bars	Look for cracks near the rings. A new rotor may be required.
		Have motor service person check motor.
Wrong Rotation (Motor)	Wrong sequence of phases	Switch any two of the three motor leads.

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