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Commissioning
9.3 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.
♦ 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.
10 Commissioning
Warranty claims can only be made if commissioning work is carried out correctly and written evidence thereof is
provided.
Safety information
♦ Commissioning may only be carried out by adequately qualified persons, details see Table 1 Qualifications, page 2.
Preconditions
♦ Installation and electrical connection have been
correctly performed.
♦ Residual material from installation and foreign objects
have been removed from the fan and ducts.
♦ 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.
♦ Data on the name plate corresponds with the
connection data.
♦ Safety devices have been fitted.
Tests
During commissioning, the following sequence must be observed:
AC motor EC motor
1. Switch the fan on.
2. Do the tests requested in the commissioning report
(18 Commissioning Report, page 21)
Speed controllable fans: “Measured data at
commissioning” at maximum speed
3. Switch the fan off.
When the mains are switched on, the motor starts an
initialization (a few seconds). After the initialization the
control input is active.
1. Switch the fan on via the control input.
2. Do the tests requested in the commissioning report
(18 Commissioning Report, page 21)
Speed controllable fans: “Measured data at
commissioning” at maximum speed
3. Switch the fan off via the control input.
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