IMO AXC 2014 04
The operation point of the fan as well as used external devices and accessories also inuence the running
characteristics. Thus, an evaluation is only possible when the machine is installed for the proper operation.
This evaluation must be done by trained personnel!
Speed-control, special regulations
• Changing of the speed causes additional loads on the fan components.
• Speed changing during normal regulation must not exceed the admissible motor temperature and the
bearing load.
• Spin-up time should be at least 60 seconds.
• The service life of fans can be extended by quick passing of the resonance frequencies.
• Speed changings should be at max. 16,7 U/sec (1,75 rad/sec) (exception: passing of the resonance fre-
quencies).
• The operating instructions of the control device manufacturer must be observed.
• Comply with EMC Directive 2004/108/EG (1st March 2005).
General information:
• The fan and the frequency inverter should be installed as near as possible to one another.
• Use shielded and coated cables.
• All components (fan, frequency inverter and motor) should be earthed.
• The use of all-pole sinusoidal lters is recommended.
• For control with frequency converter a falling below 10 Hz is inadvisable. Exceptions must be agreed
directly with the manufacturing plant.
52
Axial, smoke and heat exhaust fans, series AX