MANUAL ROOF FANS008

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Commissioning
9.2 Protecting the motor
Note:
In fans equipped with an EC motor, there is no additional motor protection needed. The motor protection is
integrated in the electronics of the motor.
Damage to motor due to overcurrent, overload or short circiut.
♦ Lead-out temperature monitors must be integrated in the control circuit in such a way that, if a fault occurs, the mo-
tor cannot switch on again automatically after it has cooled down.
♦ Motor lines and temperature monitor lines should be laid separately on principle.
♦ Without thermal protection: Use a motor protection switch!
9.3 Variable-speed fans
Resonant frequencies may result increased vibration in certain speed ranges. These vibrations may destroy
components.
♦ Only operate the fan outside these speed ranges.
♦ Pass through these speed ranges so quickly that any vibration cannot exceed the admissible resonant frequency
values.
♦ Observe the operating instructions of the frequency converter.
Damage as a result of incorrect commissioning of the frequency converter.
♦ Install the fan and frequency converter as near as possible to one another.
♦ Use shielded cables.
♦ All components (fan, frequency converter and motor) must be grounded.
♦ Avoid running the fan via the frequency converter below 10 Hz.
♦ Heating of the motor due to use of a variable frequency drive must be checked in the application by the customer.
♦ Never exceed the maximum impeller rotation speed indicated on the name plate of the fan.
♦ In any case Systemair recommends an all-pole sine filter if the fan is operated with a frequency converter.
♦ For the following fans an all-pole sine filter is mandatory to avoid damages:
DVS, DVSI, DHS, DVC, DVCI
10 Commissioning
Warranty claims can only be made if commissioning work is carried out correctly and written evidence thereof is
provided.
Safety information
♦ Observe 2 Important safety information, page 1
Preconditions
♦ Installation and electrical connection have been
correctly performed.
♦ Before switching the fan on, check for externally
visible damage and ensure that the protective
equipment functions properly.
♦ Inlet and outlet are free.
♦ Cable glands are tight.
♦ Safety devices have been fitted.
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