MANUAL ROOF FANS008

Operation
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17
Commissioning of speed-controlled fans
Check the fan for vibrations at all normal operation speeds during commissioning. Determine and evaluate vibrations
on the housing and bearing areas in accordance with DIN ISO 14694 depending on motor power and positioning.
Measurable vibration velocities depend e.g. on following factors:
• positioning
• bottom section/foundation state • flow conditions
The working point of the fan, as well as used external devices and accessories, also influence the running
characteristics.
Tests
Do the tests requested in the commissioning report (16 Commissioning Report, page 20)
11 Operation
Safety information
♦ Observe 2 Important safety information, page 1
12 Troubleshooting/maintenance/repair
Safety information
♦ Observe 2 Important safety information, page 1
12.1 Troubleshooting
Table 16 Troubleshooting
Problem Possible causes
Remedy
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.
Fan does not run
smoothly
Impeller imbalance
Rebalancing by a specialist company if possible,
otherwise contact Systemair.
Soiling on the impeller Clean carefully, rebalance
Material decomposition on the
impeller due to aggressive
material conveyed.
Contact Systemair
Impeller rotates in wrong
direction.
Change direction of rotation (swap two phases in case of
a 3– phase motor).
Contact Systemair
Deformation of impeller due to
excessive temperature.
Ensure that the temperature does not exceed the certified
value/Install new impeller.
Vibrations, oscillations
Check the installation of the fan/check the duct system,
see 8 Installation, page 11.
Fan operation in resonant
frequency range
Consider chapter 9.3 Variable-speed fans, page 16
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