W.Tech RAA Series Installation And Maintenance Manual - page 15
Pag 1
9. TROUBLESHOOTING CHART
DEFECT
POSSIBLE CAUSE
ACTION TO BE TAKEN
MOTOR ROTATES IN OPPOSITE DIRECTION
Error in connection.
Change two phases in the power supply to the motor.
ABNORMAL VIBRATION IN MECHANICAL
EQUIPMENT
Fan / fan motor.
Check state of blades and that they are correctly secured. Clean deposits from blades,
eventually verify ice formation in winter.
Check motor bolts and eventually tight.
BAD HOT WATER DISTRIBUTION
Nozzles are blocked, broken or lost.
Remove the nozzles and clean them. Eventually replace it.
BAD THERMAL EFFICIENCY OF THE TOWER
Drift eliminator is blocked.
Remove the drift eliminator, clean and eventually replace it.
Incorrect water distribution.
Remove the nozzles and clean them. Eventually replace it.
Check recirculation pump (wiring, rotation, flow)
Fouling coil.
Contact water treatment specialist for an appropriate clean.
Air intake grids are obstructed.
Clean. Eventually replace.
Basin water filter
Inspect and clean.
THE MOTOR DOES NOT START, STARTS WITH
DIFFICULTY OR DOES NOT REACH ITS RATED
SPEED AND OVERHEATS.
Bad switch connection.
Interruption in connection or in winding.
Short circuit in the field winding.
The rotor or the fan is jamming.
Short circuit to the casing or to earth.
Excessive number of motor starts.
Connect the motor correctly.
Find and eliminate the interruption.
Find and eliminate the short circuit in the windings (rewind the motor).
Find and eliminate the mechanical defects.
Find and eliminate the short circuit between the turns or the short circuit to the casing.
Extend the duration of stops in motor operation or reduce the number of starts.
ASYMMETRY OF THE CURRENT STRENGTH IN
THE SUPPLY WIRES
Interruption in connection or in winding.
Short circuit in the field winding.
Short circuit to the casing or to earth.
Find and eliminate the interruption.
Find and eliminate the short circuit in the windings (rewind the motor).
Find and eliminate the short circuit between the turns or the short circuit to the casing.
LACK OF CURRENT IN ONE OF THE WIRES
Interruption in connection or in winding.
Find and eliminate the interruption.
TEMPERATURE RELAY CUTS OFF CURRENT
WHEN MOTOR IS CONNECTED OR DURING
OPERATION
Excessive number of motor starts.
Bad switch connection.
Interruption in connection or in winding.
Short circuit to the casing or to earth.
Temperature relay is incorrectly adjusted.
Motor prepared for triangle connection and star connected.
Extend the duration of stops in motor operation or reduce the number of starts
Connect the motor correctly.
Find and eliminate the interruption.
Find and eliminate the short circuit between the turns or the short circuit to the casing.
Correctly adjust the temperature overload relay.
Connect the motor correctly.
THE MOTOR RATTLES
Interruption in connection or in winding.
Short circuit in the field winding.
Short circuit to the casing or to earth.
Find and eliminate the interruption.
Find and eliminate the short circuit in the windings (rewind the motor).
Find and eliminate the short circuit between the turns or the short circuit to the casing.
PUMP MAKES NOISE
Particles or elements inside pipes.
The pump and/or pipe are not well assembled/fixed.
Inspect basin, filter and pipes. Clean and remove.
Fix the pipes and/or electric pump correctly.