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Commissioning
8.6 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.
Important
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 motor 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!
Note:
Internally connected thermocontact: no external connection feasible or necessary.
Warning
Risk of injury because of sudden start up of the fan.
Thermost switches switch after triggering by excess temperature and closed independently after cooling
off. The fan can start up during this time.
♦ Consider that the impeller can start up suddenly without resetting the fault.
♦ Observe the 5 rules of electrical safety, see 2.3 5 rules of electrical safety, page 2.
8.7 Variable-speed fans
Warning
Resonant frequencies may result in increased vibration in certain speed ranges. These vibrations may
destroy components.
♦ Only operate the fan outside these speed ranges.
♦ Skip over 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.
Caution
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.
♦ We recommend using all-pole sinus filters.
♦ 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.
9 Commissioning
Warranty claims can only be made if commissioning work is carried out correctly and written evidence thereof is
provided.
It is recommended to fill out the commissioning report 15 Commissioning Report, page 15.
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