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AMD – Medium-pressure axial fans
Installation and Operating Instructions
13
4.3 Repair work
Repair work on the medium-pressure axial fans may only be carried out by relevant specialists.
All electrical work may only be carried out by electricians.
The installation, maintenance and servicing may only be carried out by specialists (e.g.: industrial mechanics, mecha-
tronics engineers, metal workers or persons with comparable training) with the exception of electrical work.
Optimal operational reliability of the fans is only guaranteed by Helios spare parts and manufacturer repairs.
Please contact Helios Customer Services for questions regarding commissioning, maintenance or spare parts.
4.4 Information – Fault causes
Fault/problem Possible causes Possible solutions Personnel qualification
Fan does not start – No voltage, phase missing Check mains voltage
Check connection according to wiring diagram
Electrician
– Impeller blocked Clear blockage, clean, replace impeller if nec. Specialist according to 1.6 / Manufact.
– Motor blocked Check motor, replace if necessary Electrician / Manufacturer
Fuse tripped – Ground fault/shorted coil in motor Replace motor Manufacturer
– Supply line/connection damaged Replace parts, replace motor if necessary Manufacturer
– Connected incorrectly Check connection, change Electrician
Residual current de-
vice tripped
– Motor insulation damaged Replace motor Manufacturer
– Supply line insulation damaged Replace supply lines Electrician
Motor protection
switch triggered
– Tight bearing Replace bearing Manufacturer or specialist company
authorised by manufacturer
– Impeller touching See Impeller touching
– Incorrect operating point Check suitability of fan, Check/keep inflow
and outflow clear
Specialist according to section 1.6
Impeller touching – Strong contamination Clean Instructed personnel
– Impeller damaged Replace impeller Manufacturer
– Casing damaged Replace casing Manufacturer
– Impeller not central Contact Helios customer service
Incorrect air flow di-
rection
– Incorrect installation Correct installation situation Specialist according to section 1.6
– Incorrect connection Check/change connection Electrician
Vibrations – Contamination Clean Instructed personnel
– Bearing damage Replace bearing Manufacturer or specialist company
authorised by manufacturer
– Incorrect operating point Check suitability of fan, Check/keep inflow
and outflow clear
Specialist according to section 1.6
– Attachment-related resonance Check or repair attachment, use vibration
damper
Specialist according to section 1.6
Abnormal noises – Incorrect operating point Check suitability of fan, Check/keep inflow
and outflow clear
Specialist according to section 1.6
– Impeller touching See Impeller touching
– Bearing damage Replace bearing Manufacturer or specialist company
authorised by manufacturer
– Mechanical damage Perform maintenance Specialist according to section 1.6
Power consumption
too high
– Incorrect operating point Check suitability of fan, Check/keep inflow
and outflow clear
Specialist according to section 1.6
– Impeller touching See Impeller touching
– Bearing damage Replace bearing Manufacturer or specialist company
authorised by manufacturer
Fan does not perform
(speed)
– Insufficient airflow Check/keep inflow and outflow clear. Determine
operating point (air volume + system pressure
loss) and compare with fan characteristic curve
Specialist according to section 1.6
– Incorrect voltage Check/change connection Electrician
– Bearing damage Replace bearing Manufacturer or specialist company
authorised by manufacturer
– Contamination Clean Instructed personnel
– Insufficient backflow Consider minimum distance on intake-side Specialist according to section 1.6
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