Fault and rectification
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All fan structural designs are susceptible to the following faults (continued)
Fault
Possible cause
Remedial measure
Power consumption as
prescribed on the motor
nameplate exceeded in the
operating condition
Fan conveying excessive flow
volume
Reduce the flow volume with
damper (throttle damper, shut-off
damper, etc.) / for frequency-
controlled fan: reduce speed
Operation with 60 Hz rather than
with 50 Hz
Fan will not start
Motor not connected correctly
Check the connection of motor
Motor faulty
Replace the motor
Control unit of fan in plant not
configured correctly
Check control unit in the control
room
Motor protection has been
triggered as a result of
impermissibly high temperature
Allow the motor to cool, regulate
the fan with damper or variable
speed control
Fuse for motor has tripped
Establish the cause and replace
the fuse
Shutdown has been triggered as
a result of exceeding the limit
values of the monitoring devices
Rectify the faults, resetting of
alarm signal by the person
responsible for the plant
Fan is not powering up to
nominal speed
With star-delta connection, motor
remains in star connection
Switch over to delta connection,
reduce the switchover time
Duration for powering up too
long
Close the damper
Starting current too high
Execute star-delta connection,
local mains network too weak,
check safeguarding
Fan output too low
Incorrect direction of rotation
Change direction of rotation by
reversing polarity of the motor.
Refer to chapter 9.2
Pressure loss too great in the
duct work
Check duct work
Dampers not opened or not
opened completely
Open dampers completely
Duct work blocked, damaged or
not correctly connected
Remove foreign bodies from
duct work, replace damaged
parts, inspect connections for
leaks
NOTICE!
A REITZ service technician can be requested to
rectify all manner of faults. Refer to chapter 14.1
Requesting a REITZ service technician.
Table 11-2 Faults and remedial measures (all structural designs) - continued
