14
Malfunction Remedy
Possible causes
Remedy
Air output of the fan too
low
Direction of rotation of impeller incorrect
Change the direction of rotation if
possible. Otherwise, please contact
Walpol.
Incorrect connection wiring (e.g. star instead of
delta).
Check the connection wiring and
correct it if necessary.
Pressure losses too high.
Optimize the channel routing.
Volume flow controllers are not or only partially
open.
Check opening position on site.
Inlet or pressure paths blocked.
Remove blockage.
Grinding noises during
start-up or operation of
the fan
Check whether the duct connections on the fan
are braced.
Loosen and realign duct connections.
Thermal contact/ PTC
thermistor tripped
Direction of rotation of impeller incorrect
Change the direction of rotation if
possible. Otherwise, please contact
Walpol.
Missing phase
When using a 3-phase motor (no EC),
check that all 3 phases are present.
Engine overheating
Check impeller cooling (if present),
check resistance of motor windings (if
possible) / contact Walpol.
Capacitor (if used) not or not correctly con-
nected
Connect the capacitor correctly.
Motor blocked
Contact Walpol
Fan does not reach
nominal speed
Defective motor winding
Contact Walpol
Drive motor misaligned
Contact Walpol
Control devices (if used), such as frequency
converter or transformer are set incorrectly.
Set control devices correctly.
Mechanical blocking
Remove blockage.
Motor does not rotate
Incorrect supply voltage
Check supply voltage, restore voltage
supply.
Connection defective
Disconnect from power supply, correct
connection according to wiring diagram
Temperature monitor has responded.
Allow the engine to cool down. Deter-
mine and eliminate the cause of the
error.
Electronics/motor
overheated
Cooling insufficient
Improve cooling.
Motor overload
Check that the correct fan is used for
the application.
Ambient temperature too high
Check that the correct fan is used for
the application.
