Cooling Tower : Tips for Troubles
Cooling Tower : Tips for Troubles
Cooling Tower : Tips for Troubles
Problem
Probable Cause for The Problem
Solutions
Motor will not start
Unusual motor noise
Motor Runs hot
Noise
Power not available at motor terminals
Motor running single phase
Motor leads connected incorrectly
Ball bearings
Rotor unbalance
Electrical unbalance
Cooling fan hitting guard
Air gap uniform
Wrong voltage or unbalanced voltage
Gear reducer bearings
Gears
Overload
Wrong motor rpm
Bearings overgreased
Rotor rubs stator bore
Wrong lubricant in bearings
Poor ventilation
One phase open
Winding fault
Bent motor shaft
Insufficient grease
Deterioration of or foreign material on grease
Bearings damaged
Incorrect fan blade pitch
Wrong connections
Low Voltage
Open circuit in motor winding
Motor or fan drive stuck
Rotor defective
Check power at starter. Correct any bad connections between the control apparatus and the motor.
Stop motor and attempt to start it. Motor will not start if single phased. Check wiring, controls and motor.
Check motor connections against wiring diagram on motor.
Check lubrication, replace bad bearings.
Rebalance.
Check voltages and currents of all three lines. Correct if required.
Reinstall or replace fan.
Check and correct bracket fits or bearing.
Check voltage and current of all three lines against nameplate value.
If new, see if noise disappears after one week of operation. Drain, flush and refill Gear reducer. See Gear reducer service manual, if noisy, replace.
Correct tooth engagement. Replace badly worn gears and imperfect tooth spacing or form.
Check fan blade pitch. Check for drag in fan drive train as from damaged bearings.
Check nameplate against power supply. Check rpm of motor and gear ratio.
Remove grease reliefs. Run motor up to speed to purge excessive grease.
If not poor machining, replace worn bearings.
Change to proper lubricant. See motor manufacturer’s instructions.
Clean motor and check ventilation openings. Allow ample ventilation around motor.
Stop motor and attempt to start it. Motor will not start if single phased. Check wiring, controls and motor.
Check with ohmmeter.
Straighten or replace shaft.
Remove plugs and replace bearings.
Flush bearings and Re lubricate.
Replace bearings.
See fan service manual for blade pitching instructions.
Check starter contacts and control circuit. Reset overloads.
If power is not on all leads at starter make sure overload and short-circuit devices are in proper condition.
Check motor and control Connections against wiring diagrams.
Check nameplate voltage against power supply. Check voltage at motor terminals.
Check stator windings for open circuit.
Disconnect motor from load and check motor and Gear reducer for cause of problem.
Look for broken bars or rings.
Problem
Probable Cause for The Problem
Solutions
Motor will not start
Unusual motor noise
Motor Runs hot
Noise
Power not available at motor terminals
Motor running single phase
Motor leads connected incorrectly
Ball bearings
Rotor unbalance
Electrical unbalance
Cooling fan hitting guard
Air gap uniform
Wrong voltage or unbalanced voltage
Gear reducer bearings
Gears
Overload
Wrong motor rpm
Bearings overgreased
Rotor rubs stator bore
Wrong lubricant in bearings
Poor ventilation
One phase open
Winding fault
Bent motor shaft
Insufficient grease
Deterioration of or foreign material on grease
Bearings damaged
Incorrect fan blade pitch
Wrong connections
Low Voltage
Open circuit in motor winding
Motor or fan drive stuck
Rotor defective
Check power at starter. Correct any bad connections between the control apparatus and the motor.
Stop motor and attempt to start it. Motor will not start if single phased. Check wiring, controls and motor.
Check motor connections against wiring diagram on motor.
Check lubrication, replace bad bearings.
Rebalance.
Check voltages and currents of all three lines. Correct if required.
Reinstall or replace fan.
Check and correct bracket fits or bearing.
Check voltage and current of all three lines against nameplate value.
If new, see if noise disappears after one week of operation. Drain, flush and refill Gear reducer. See Gear reducer service manual, if noisy, replace.
Correct tooth engagement. Replace badly worn gears and imperfect tooth spacing or form.
Check fan blade pitch. Check for drag in fan drive train as from damaged bearings.
Check nameplate against power supply. Check rpm of motor and gear ratio.
Remove grease reliefs. Run motor up to speed to purge excessive grease.
If not poor machining, replace worn bearings.
Change to proper lubricant. See motor manufacturer’s instructions.
Clean motor and check ventilation openings. Allow ample ventilation around motor.
Stop motor and attempt to start it. Motor will not start if single phased. Check wiring, controls and motor.
Check with ohmmeter.
Straighten or replace shaft.
Remove plugs and replace bearings.
Flush bearings and Re lubricate.
Replace bearings.
See fan service manual for blade pitching instructions.
Check starter contacts and control circuit. Reset overloads.
If power is not on all leads at starter make sure overload and short-circuit devices are in proper condition.
Check motor and control Connections against wiring diagrams.
Check nameplate voltage against power supply. Check voltage at motor terminals.
Check stator windings for open circuit.
Disconnect motor from load and check motor and Gear reducer for cause of problem.
Look for broken bars or rings.
Problem
Probable Cause for The Problem
Solutions
Motor will not start
Unusual motor noise
Motor Runs hot
Noise
Power not available at motor terminals
Motor running single phase
Motor leads connected incorrectly
Ball bearings
Rotor unbalance
Electrical unbalance
Cooling fan hitting guard
Air gap uniform
Wrong voltage or unbalanced voltage
Gear reducer bearings
Gears
Overload
Wrong motor rpm
Bearings overgreased
Rotor rubs stator bore
Wrong lubricant in bearings
Poor ventilation
One phase open
Winding fault
Bent motor shaft
Insufficient grease
Deterioration of or foreign material on grease
Bearings damaged
Incorrect fan blade pitch
Wrong connections
Low Voltage
Open circuit in motor winding
Motor or fan drive stuck
Rotor defective
Check power at starter. Correct any bad connections between the control apparatus and the motor.
Stop motor and attempt to start it. Motor will not start if single phased. Check wiring, controls and motor.
Check motor connections against wiring diagram on motor.
Check lubrication, replace bad bearings.
Rebalance.
Check voltages and currents of all three lines. Correct if required.
Reinstall or replace fan.
Check and correct bracket fits or bearing.
Check voltage and current of all three lines against nameplate value.
If new, see if noise disappears after one week of operation. Drain, flush and refill Gear reducer. See Gear reducer service manual, if noisy, replace.
Correct tooth engagement. Replace badly worn gears and imperfect tooth spacing or form.
Check fan blade pitch. Check for drag in fan drive train as from damaged bearings.
Check nameplate against power supply. Check rpm of motor and gear ratio.
Remove grease reliefs. Run motor up to speed to purge excessive grease.
If not poor machining, replace worn bearings.
Change to proper lubricant. See motor manufacturer’s instructions.
Clean motor and check ventilation openings. Allow ample ventilation around motor.
Stop motor and attempt to start it. Motor will not start if single phased. Check wiring, controls and motor.
Check with ohmmeter.
Straighten or replace shaft.
Remove plugs and replace bearings.
Flush bearings and Re lubricate.
Replace bearings.
See fan service manual for blade pitching instructions.
Check starter contacts and control circuit. Reset overloads.
If power is not on all leads at starter make sure overload and short-circuit devices are in proper condition.
Check motor and control Connections against wiring diagrams.
Check nameplate voltage against power supply. Check voltage at motor terminals.
Check stator windings for open circuit.
Disconnect motor from load and check motor and Gear reducer for cause of problem.
Look for broken bars or rings.
FAQ
FAQ
FAQ
What is a cooling tower?
Why and where cooling towers are needed?
Why Repair / Service Cooling Towers?
What MELFRANK will do for you?
How MELFRANK does it?
What services can MELFRANK provide?
What MELFRANK has Improved ?