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Installation and Operating Instructions
ATTENTION
IVR EC – Jet Fans
− Damaged surface protection must be renewed.
− All elastic elements must be freely moveable.
− If monitoring devices are fitted, a functional test should be carried out.
Once everything is in orderly condition, reconnect the fan to the power supply and commission the fan. If necessary,
in-situ balancing is recommended.
43 Repairs
A motor or impeller replacement may only be carried out by specialist personnel authorised by the manufacture. Please
contact the manufacturer for this purpose.
Spare parts can be ordered from the manufacturer using the order number or type plate data. Please contact the
manufacturer for this purpose.
m Risk of injury/damage due to the use of unsuitable spare parts
Dangers can arise for personnel and damage, malfunctions or total failures of the fan can be caused by the use of
unsuitable or defective spare parts. Only use original spare parts from the manufacturer or spare parts approved by
the manufacturer. Please contact the manufacturer in case of uncertainty.
44 Fault causes and diagnosis
Fault
Fan does not start up
Motor protection has
switched off
Motor temperature too
high
Motor noises
Fan not running smoo-
thly
Flow rate not in order
Pressure/flow rate
decreases
Grinding noises in fan
Strong vibration
Possible cause
No voltage
Incorrectly connected
Start/reactivation. Switching
frequency too high (control)
Motor protection device too weak
Start-up time too long
Defective motor
Start-up current too high
Defective motor
Defective fuse
Impeller is stuck
Bearing damage
Defective motor
Motor bearing damage
Caking on impeller blades
Worn impeller
Fan tension due to uneven mount
Damage to rings and rolling ele-
ments, rolling surfaces of rolling
bearings
Wear as a result of contamination
or insufficient lubrication
Unsuitable lubrication
Incorrect direction of rotation of
impeller
System parts are not functional
Imbalance
9
Solution
• Check power supply
• Restore power supply
• Check connection
• Let motor run from warm ope-
rating condition
• Cable cross-section and pro-
tection device must protect the
start-up current during start-up
• Check tightening torque for
motor MA/MN
• Check motor and replace if
necessary
• Incorrect voltage. Local net-
work too weak
• Check motor and replace if
necessary
• Check fuse and replace if
necessary
• Contact manufacturer
• Contact manufacturer
• Check motor and replace if
necessary
• Contact manufacturer
• Clean impeller blades
• Replace impeller
• Loosen ceiling mount. Level
out unevenness, then recon-
nect fan.
• Contact manufacturer
• Protect bearing against dirt.
Use clean grease.
• Only use lubrication specified
by manufacturer
• Check direction of rotation. If
necessary, contact manufac-
turer.
• Check system parts. If neces-
sary, contact manufacturer.
• Contact manufacturer
• Contact manufacturer
EN
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