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IOM_WPHBA HE-WPHA HE_091a1201_207815_180701_EN
HORIZONTAL WATER-AIR COMPACT PACKAGED UNITS
WPHA HE / WPHBA HE
MAINTENANCE
FAN WITH EC MOTOR
Diagnosis / Failures
Trouble shooting
Type of
failure
Possible Cause
Solution
The fan
does not
rotate
Power supply blackout. Cut of a
phase. Overvoltage or very low
voltage.
Check the power supply.
Short circuit to ground.
Check the motor connections and the power supply.
Short circuit in winding.
Replace the fan.
The thermal protection of the motor
has been switched off (the motor is
overheated).
Check that the air passages; if it is necessary to remove the
foreign bodies "The drive wheel is blocked or dirty" check the
temperature of supply air. Check the voltage.
The drive wheel is blocked or dirty.
Switch off power to the motor and secure against switching
back on.
Check safe isolation from supply.
Remove safety grille.
Remove foreign bodies or soiling.
Remount the safety grille.
The fan
does not
start
The temperature is very low for the
bearing grease.
Insert bearing with cold greasing.
The airflow circulates in the wrong
direction (the motor moves with
many revolutions in the wrong
direction).
Check the air flow.
In cases where the air flow is very strong, it is possible that the fan
will not start up.
The fan
rotates very
slowly
Rotor / blade drags / rubs.
Remove foreign bodies / dirt on the fan, if necessary.
Temperature management
activated. Effective (motor or
electronic system overheated).
Check that the air passages; if it is necessary to remove the
foreign bodies "The drive wheel is blocked or dirty" check the
temperature of supply air. Check the mounting space (air speed
above the radiator).
Very low
flow
The fan rotates very slowly.
Check type of failure
“The fan rotates very slowly.”
Airways blocked.
Check that the air passages
(residual air flap / inlet, filters) "The
drive wheel is blocked or dirty" check the temperature of supply
air.
The pressure loss is different than
projected.
Check the mounting space (air speed above the radiator).
Vibrations
Horizontal swing of the wheel.
Check that the fins / blades are not damaged or dirty or have ice
"Rotor blocked or dirty".
Without vibration damper or with a
false one (radial only).
Install the correct vibration damper.
Strange
noises
Damaged / worn bearing.
Replace the bearing.
With the construction size of the motor 055 "(Z" / "B" with
transverse flow), replace the fan.
Rotor / blade drags / rubs.
If necessary, remove foreign bodies / dirt from the fan. "Impeller
blocked or dirty."
Operation beyond the reference
point (in axial fans).
Check that the air passages
(residual air flap / inlet, filters).
False cover in the duct (in radial
fans).
Check the installation instructions.
