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| Troubleshooting/maintenance/repair
Activities for fans used for emergency operation. cont'd
Operational readiness of the
emergency system
Allow the "emergency" system to run for
15 minutes
X
Function of the “emergency” control
Test whether the “emergency” control
effectively bridges all the other controls
and switches
X
Function of the standstill heating
Switch the motor off. The standstill heating
must switch on automatically and remain
switched on
X
11.3 Variable-speed fans
Important
The fan may be destroyed due to unpermitted frequencies.
♦ Pay particular attention to damage from vibrations.
♦ After commissioning, start with shorter maintenance intervals.
♦ If no damage occurs, adjust the maintenance intervals up to the those stated in the operating
instructions.
♦ Responsibility for gradual adaptation is with the system operator.
11.4 Overhaul/further maintenance
Pay attention to the safety references and preconditions as in normal maintenance. For the following activities and
functions, contact Systemair:
• complete overhaul of motors
• replacement of bearings
• re-winding of motors
• monitoring of condition
• vibration analysis
• Impeller change (note 5.1.3 Air gap between housing
and impeller, page 5)
Extension of maintenance intervals
♦ Systemair axial fans withoutVDD need to be maintained after a 20,000/40,000 hours of operation (depending on
the type of motor bearing) or at the latest after 5 years.
♦ The maintenance intervals can be prolonged using VDD, as shown in the table below.
after hours of operation: at the latest after:
without VDD with VDD without VDD with VDD
motor with closed
bearings
40000 hours 60000 hours
5 years 8 years
motor with open
bearings
20000 hours 40000 hours
5 years 8 years
If the fan is operating with VDD, maintenance action is necessary after above specified time or if the limit values for vi-
bration according to ISO 14694:2003 are exceeded.
Steps to maintain a Systemair axial fan:
♦ Check the condition of the shaft sealing rings and shaft bearings and take action if necessary.
♦ If the motor is equipped with a relubrication device, relubricate according
to the specifications of the motor
manufacturer.
Work before switching on again
♦ Attach all the safety and protective devices tightly and securely.
♦ Remove all the devices with which you have blocked the rotor.
♦ Remove all assembly residues and foreign bodies from the area around the fan unit.
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