4.0 Servicing and maintenance
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The safety instructions specified in Chapter 1, section 1.2 must be observed!
– The units are basically maintenance-free, there is no provision for user-maintenance. Nevertheless, all necessary
maintenance work must be carried out by authorised specialist personnel cf. section 2.0!
– Excessive deposits of dirt, dust, grease, etc. on the impeller, motor, protection guard and, above all, between the
housing and the impeller, are not permitted, as these can lead to an unbalance in the impeller, overheating of the
motor or the blocking of the impeller. In such cases, the unit must be cleaned, see section 4.1 Cleaning.
– Insofar as the unit has an important supply function, regular usage-based maintenance is required. In cases of longer
periods of standstill, maintenance must be carried out when the unit is restarted.
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It must be ensured that the fan has been (all poles) disconnected from the mains power supply and secured
against reconnection before any work!
– The following must be checked:
• Secure mounting of the fan to the subsurface / system
Ý
replace in case of doubt
• Contaminant deposits
Ý
remove, see Cleaning 4.1
• Mechanical damage
Ý
decommission unit, replace damaged parts
• Tightness of screw connections, particularly impeller mounting. Do not loosen screws in the process!
• Housing surface coating (e.g. rust, paint defects)
Ý
repair
• Freewheeling of the impeller -> Is the impeller not running freely- see Fault causes 4.2
• Bearing noises
Ý
replace motor
• Vibrations
Ý
see Fault causes 4.2
• Power consumption according to type plate
Ý
see Fault causes 4.2
• Function of safety components (e.g. motor protection switch)
Ý
replace if necessary
4.1 Cleaning
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The safety instructions specified in Chapter 1, section 1.2 must be observed!
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It must be ensured that the fan has been (all poles) disconnected from the mains power supply and secured
against reconnection before starting cleaning!
– The disassembly of the unit or parts of the unit may be necessary for the cleaning.
This must be carried out by suitable specialist personnel cf. section 2.0!
– Clean flow area as well as impeller and motor.
– Do not use aggressive, paint-damaging cleaning agents!
– High pressure cleaners or jet water is not permitted!
4.2 Information – Fault causes
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The safety instructions specified in Chapter 1, section 1.2 must be observed!
The elimination of faults must only be carried out by specialist personnel cf. section 2.0!
8
Axial high-performance fans HQ.. / HRF.. / HW..
Installation and Operating Instructions
ATTENTION
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DANGER
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ATTENTION
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CHAPTER 4
SERVICING AND
MAINTENANCE
Error/fault
Causes
Troubleshooting
Fan does not start
No voltage
Check mains voltage
Condensator defective
Check/replace condensator
Impeller blocked
Clear blockade, clean, replace impeller
if necessary
Motor blocked
Check motor, replace if necessary
Fuse blows
Short-circuited coil/ground fault in
motor
Replace motor
Supply line/connection damaged
Replace parts, replace motor if necessary
Connected incorrectly
Check connection, change
Fehlerstromschutz-
schalter löst aus
Motor insulation damaged
Replace motor
Supply line insulation damaged
Replace supply lines
Motor protection switch
triggered
Tight bearings
Replace bearings
Impeller touching
Clean, replace impeller if necessary
Incorrect operating point
Check suitability of fan, Check/keep inflow
and outflow clear
Polluted motor
Clean
Incorrect flow direction
Incorrect installation
Correct installation situation
Incorrect connection
Check/change connection
Vibrations
Contamination
Clean
Bearing damage
Replace motor
Incorrect operating point
Check suitability of EC fan, Check/keep
inflow and outflow clear
Mounting-related resonance
Check/repair mounting, use vibration
damper
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EN
