IMO PRF, PRF EX 009 312436

Troubleshooting/maintenance/repair |
17
Troubleshooting cont'd
Thermal contacts/
resistors have
triggered
Impeller rotates in wrong
direction.
Change direction of rotation (swap two phases in case of
a 3– phase motor).
Contact Systemair
Missing phase
In case of a 3 phase standard motor (not EC), check if all 3
phase are present.
Motor overheated
Check the cooling impeller (if used), measure the motor
winding (if possible) / contact Systemair.
Motor blocked
Contact Systemair
Fan does not reach
nominal speed
Defective motor winding Contact Systemair
Control units (if used) such as
frequency converter or
transformer are set incorrectly.
Correct the settings of the control units.
Mechanical blockage Remove the blockage.
Frozen condensate blocking the
impeller
Thaw and drain the condensate
Motor does not
rotate
Faulty supply voltage Check the supply voltage, re-establish the voltage supply.
Faulty connection
Disconnect from the power supply, correct the
connection, see circuit diagram.
Temperature monitor has
responded.
Allow the motor to cool down, find and resolve the cause
of the fault.
Electronics/motor
overheated
Insufficient cooling Improve cooling.
Overloaded motor
Check if the correct fan is used for your application.
Ambient temperature too high Check if the correct fan is used for your application.
Note:
For all other damage/defects, please contact Systemair. Defective safety-relevant fans (for Ex and smoke
extraction applications) must be replaced completely.
14.2 Maintenance
Warranty claims can only be made if maintenance work is carried out correctly and written evidence thereof is
provided.
We recommend regular maintenance intervals to ensure continuous fan operation. These maintenance intervals are
specified in the “Activities” table below. In addition, the operator must carry out follow-up activities such as cleaning,
replacing defective components or other corrective measures. For traceability reasons, a maintenance plan must be
created which documents the work carried out. This must be created by the operator. If the operating conditions are
"extreme", the maintenance intervals must be reduced so that maintenance is carried out more frequently. Examples
of extreme operating conditions:
• Durable ambient temperature > 35 ºC or < 5 ºC, or temperature fluctuations > 20 K
• Use in an explosion capable area
Table 7 Activities
Normal operating
conditions
Extreme operating
conditions
Activity
Every six
months
Annually Quarterly
Every six
months
Check the fan and its components for visible damage,
corrosion and contamination.
X X
Check the impeller for damage and imbalance.
X X
Clean the fan/ventilation system (see 15 Cleaning, page
19).
X X
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