Troubleshooting And Repairs - Multifan Panel Fan V2E Séries Instructions D'installation Et Mode D'emploi

Panel Fan
8

Troubleshooting and repairs

Fault
Airflow too high
Airflow too low
Excessive vibration
Fan does not start
Fan does not start
(supply voltage at fan motor terminals is present)
Fan motor overheats while running
Fan rotates in wrong direction
Fan speed (rpm) is too low
High power consumption
Unusual or excessive noises
INS00015-C Original instructions
Possible cause
Fan speed (rpm) too high
System resistance lower than specified
System resistance higher than specified
Impeller imbalance -> impeller damaged
Impeller imbalance -> impeller dirty
Bearings are damaged or worn
No power supplied to fan
(If present) VFD (Variable Frequency Drive) defect-
ive
Thermal protection activated
(Fan motor has overheated)
Impeller blocked
Only for 1~ fan motors: wrong or defective capacitor Replace the capacitor
Temperature too low for the bearing grease
Fan is overloaded
Fan motor overheated due to dirt in cooling fins.
Supply voltage too high or too low
Incorrect supply frequency
Only for 3~ motors: phase voltage imbalance
Only for 1~ motors: wrong or defective capacitor
1~ fan motors: capacitor incorrectly connected
3~ fan motors: supply incorrectly connected
Supply voltage is too low
Incorrect supply frequency
Only for 1~ fans: wrong or defective capacitor
Only for 3~ fans: STAR instead of DELTA connec-
ted
3~ fan motors: Phase failure
Fan is overloaded
Fan speed is too high
Impeller hits fan housing
Fan is operating in stall point
WARNING
Troubleshooting and repairs must be performed by skilled
persons only!
Possible remedy
Check supply voltage and frequency
Reduce fan speed (if fan can be speed controlled)
Choose alternative fan
Choose alternative fan
Lower system resistance
Replace the impeller
Clean the impeller
Replace the bearings
Check all power supplies
Check fuse/circuit breaker
Check VFD (refer to VFD manufacturers' instruc-
tions)
Clean the motor
Check for overloading of fan system (intake or ex-
haust blocked?)
Check if the supply voltage is not too high or too low
Remove the blockage
Do not operate the fan outside the ambient temper-
ature range as specified on the rating plate and
technical data sheet
Check for overloading of the fan system (intake or
exhaust blocked?)
Clean the motor
Check the power supply
Check the power supply
Check the power supply
Replace the capacitor
Connect according to wiring diagram (contact sup-
plier)
Swap any 2 of the 3 phases of the supply
Check the power supply
Check the power supply
Replace the capacitor
Connect as DELTA
Check wiring diagram!
Restore all 3 phases
Check for overloading of the fan system (intake or
exhaust blocked?)
Check the supply voltage and frequency
Check the installation and fixings and alignment
Lower the system resistance
(Intake or exhaust blocked)
ENGLISH | 9