Fault and rectification
Operating_Manual_Fan_KXE_04_en.docx
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The following faults can occur on fan structural designs K (coupling) and R (belt)
Fault
Possible cause
Remedial measure
Fan not running
smoothly
Damage to bearings of the fan
shaft
Replace the bearings
Lubrication of bearings for fan
shaft insufficient
For grease bearings: Re-lubricate.
For oil bearings: Refill oil.
Bearing temperature
too high (above the
permissible operating
temperature)
For grease bearings: Excessive
lubricating grease pressed into
the bearings of the fan shaft
Excess grease is exuded automatically,
bearing temperature then reduces to
normal operating temperature
For grease bearings: Insufficient
lubricating grease pressed into
the bearings of the fan shaft
Replace the bearings and re-lubricate
at regular intervals as prescribed in the
manual
Bearing damage
Replace the bearings
For configuration with cooler fan:
Insufficient cooling air
Switch on the cooler fan, clean the
discharge of the cooling air line
For oil bearings: Minimum speed
below permissible value
Increase speed
The following faults can occur on fan structural design K (coupling)
Fault
Possible cause
Remedial measure
Fan not running
smoothly
Coupling is not aligned
Align the coupling. Refer to chapter 8.1
Coupling rubbers damaged or
worn
Replace the coupling rubbers
Severe impacts during
start-up
Coupling rubbers damaged or
worn
Replace the coupling rubbers
Start-up torque of motor too high Change connection to star-delta
connection
Coupling rupture
High torque impacts upon restart
with residual speed
Restart only when the impeller is at a
complete standstill
Table 11-3 Faults and remedial measures (for structural designs K and R)
Table 11-4 Faults and remedial measures (for structural design K)
