Chapter 6 Service And Maintenance; Troubleshooting; Clean Unit - Helios VDD T120 Montage- Und Betriebsvorschrift

Installation and Operating Instructions
EN
CHAPTER 6
SERVICE AND
MAINTENANCE
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DANGER
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DANGER
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WARNING
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WARNING
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Roof fans – VDD T120
6.1

Troubleshooting

The elimination of faults must only be carried out by specialist personnel, cf. section 1.6 "Personnel qualification", page
4.
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Danger to life due to electric shock!
An electric shock can result in death or serious injuries.
> The unit must be fully isolated from the mains power supply and secured against switching on again before
troubleshooting.
> Electrical work may only be carried out by an authorised electrician.
Error/fault
Fan does not start
Fuse tripped
Residual current device
tripped
Motor protection
switch triggered
Vibrations
6.2

Clean unit

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Danger to life due to electric shock!
An electric shock can result in death or serious injuries.
> Before any maintenance and cleaning work or before opening the cover, the unit must be fully isolated from the
power supply.
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Risk of burns due to hot surfaces!
Hot surfaces on the fan casing can cause serious burns.
> Wear suitable protective gloves.
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Risk of injury due to the rotating impeller!
The rotating impeller can injure limbs or cause serious injuries.
> Wait until the impeller has come to a standstill before working on the unit.
> Do not reach into the rotating impeller.
> Wear suitable protective gloves.
ⓘ The disassembly of the unit or parts of the unit may be necessary for the cleaning. This may only be carried out
by suitable specialist personnel, cf. section 1.6 "Personnel qualification", page 4!
The following points must be observed for cleaning the unit:
• Clean the fan flow area, impeller, struts and motor.
• Do not use aggressive cleaning agents that could damage the paintwork!
• High pressure cleaners or water jets are not permitted for cleaning the unit!
Causes
No voltage, one phase missing
Impeller blocked
Motor blocked
Shorted coil/ground fault in motor
Supply line/connection damaged
Connected incorrectly
Motor insulation damaged
Supply line insulation damaged
Tight bearings
Impeller touching
Incorrect operating point
Dirty motor
Contamination
Bearing damage
Incorrect operating point
Attachment-related resonance
Incorrect direction of rotation
Impeller imbalance
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Solution
Check mains voltage
Clear blockage; clean or
replace impeller if necessary
Check motor; replace if necessary
Replace motor
Replace supply line; replace motor if req.
Check connection
Replace motor
Replace supply line
Replace bearings
Clean impeller; replace if necessary
Check suitability of fan, check/keep inflow
and outflow clear
Clean motor
Clean
Replace bearings
Check suitability of fan, check/keep inflow
and outflow clear
Check attachment; use vibration
dampers if necessary
Check connection
Rebalancing by a specialist company