Maintenance Subjects; Troubleshooting And Repairs - Multifan V-FloFan Mode D'emploi

7.2

Maintenance subjects

Cleaning
In areas of application where high levels of contamination are present,
cleaning intervals should be adjusted accordingly.
Cleaning is preferably done using a soft brush. Do not use any aggressive
detergents, solvents or chemicals for cleaning.
Wet cleaning
Wet cleaning is allowed using low pressure clean water spray. Avoid directing
water jets at bearings and electrical connections as much as possible.
When wet cleaning is planned, close any open condensate drain holes before
commencing wet cleaning.
WARNING
Do not use a high pressure cleaner.
Water may penetrate electrical connections and bearings.
► After wet cleaning
1. Open the condensate drain hole at the lowest point of the fan motor.
2. Run the fan for 2 hours at full speed to remove any moisture that may
have entered the fan motor.
Bearings
The bearings used in the fan and/or fan motor are maintenance free and
greased for life. Average lifespan during normal operation is >30.000 hours.
Fault
Excessive vibration
Fan does not start
Fan does not start
(supply voltage at fan motor terminals is present)
Fan motor overheats while running
Fan motor overheats while running
8 | ENGLISH
Defects in the bearings can usually be detected by listening. When the shaft /
impeller is rotated by hand, it should move freely with a smooth uniform
sound. Squeaking or grinding noises indicate the bearings may require
replacement.
Impeller
Cleaning the impeller is very important. A dirty impeller will suffer from
imbalance resulting in vibrations. A dirty impeller will also result in reduced fan
performance and reduced fan efficiency.
Capacitor (1~ fan motor)
Capacitor capacitance decreases slowly over time. Average lifespan is ±
30.000 hours. Replace the capacitor when the capacitance has dropped
below the value as listed on the capacitor.
Start capacitor (1~ fan motor)
The start capacitors' lifespan is 500.000 starts. Replace the start capacitor
when the number of starts has reached 500.000.
The start capacitor cannot be serviced or repaired. The start capacitor must
be replaced if it is not functioning properly anymore.
8
Possible cause
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
Only for 1~ fan motors with start capacitor: Start ca-
pacitor does not disengage after motor has started
(continuously on)

Troubleshooting and repairs

WARNING
Troubleshooting and repairs must be performed by skilled
persons only!
Possible remedy
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
Replace start capacitor
Original instructions
V-FloFan
INS00008-B