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© Munters AB, 2020
After this series of checks has been carried out, the fan is ready for its first startup.
WARNING
Some models of our fans allow to adjust the number of revolutions through inverter ( also called
VFD). In case of adjustment made by VFD the installer has to pay particular attention to the following aspects:
•
it is necessary that the resistance of the ground line to which the equipment are connected has a very low values
(about 15-20 ohm) in order to avoid high currents that can flow through the motor bearings and damage them.
•
It is necessary to install the proper line filters, to avoid interference and allow proper operation of the equipment.
•
The minimum frequency of operation of the engines in the case of absence of a forced external ventilation is 30
Hz. In the case of an operating frequency below 30 Hz is necessary to provide an external forced ventilation to
the engine.
