10 Maintenance/troubleshooting
WARNING
Hazard from electrical voltage!
» Trouble setting and service only by a trained electrician or trained and instructed qualifi ed personnel!
» Observe rules for safe work while troubleshooting!
» Observe 5 safety rules for the electrical expert!
– disconnect from the power supply (all-pole),
– prevent switching on again,
– test absence of voltage,
– earthing and short-circuiting,
– protect adjacent live parts by covers and barriers.
» Switch the fan off as planned.
WARNING
Risk of crushing in hinged fans by the hinged frame shutting!
The hinged frame is very heavy because the fan wheel has been fi tted on it.
» Open and close the hinged frame carefully!
10.1 Preconditions
• Energy supply has been switched off (all-pole current cut-out).
• The rotor is at a standstill
10.2 Faults and troubleshooting
Fault Possible causes Remedy
Fan does not run smoothly Rotor imbalance Re-balancing by specialist company
Adhesions to the rotor Clean carefully, rebalance if necessary
Material decomposition on the rotor due to
aggressive material conveyed
Contact the manufacturer
Wrong direction of rotation of rotor Change direction of rotation
Deformation of rotor due to excessive tem-
perature
Contact manufacturer, install new rotor, check
bearings
Air output of fan too low Wrong direction of rotation of rotor Change direction of rotation
Losses of pressure in lines too high Different line guidance
Throttle organs not or only partly open Check opening position on site
Intake or pressure paths blocked Remove obstacles
Grinding sounds in operation or
start of the fan
Intake line installed twisted Loosen intake line and realign
Thermo-contacts/posistors have
reacted
Capacitor not or not correctly connected Connect capacitor
Wrong direction of rotation of rotor Change direction of rotation
Motor blocked Contact the manufacturer
Fan does not reach nominal speed Electrical switching devices set wrongly Check and possibly reset setting of switching
device
Motor coil defective Contact the manufacturer
Drive motor has been designed wrongly Contact the manufacturer for check of start
torque
Table 16: Troubleshooting
49
Roof fans - V 1.0
Maintenance/troubleshooting
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