EN
EN
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 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
