GB Commissioning
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9.8 Variable-speed fans (frequency converter/EC motor)
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.
♦ If controlling the fans via a frequency converter, provide thermal protection in the form of a PTC resistor
or thermal contacts (TC) in the motor.
10 Commissioning
10.1 Safety information
♦ Commissioning may only be carried out by adequately qualified persons, details see Table 1 Qualifications, page 6.
♦ Wear protective equipment during all work in the vicinity of the fan, details see 2.2 Personal protective equipment,
page 6.
10.2 Preconditions
♦ Installation and electrical connection have been correctly performed.
♦ Residual material from installation and foreign objects have been removed from the fan and ducts.
♦ Inlet and outlet are free.
♦ Safety devices have been fitted.
♦ Ground cable is connected.
♦ Cable glands are tight.
♦ Nominal current (from the name plate) is not exceeded.
♦ Data on the name plate corresponds with the connection data.
10.3 Tests before activation
♦ Check that safety elements and protection grilles are securely fastened.
10.4 Tests (standard motor)
1. Before switching the fan on, check for externally visible damage and ensure that the protective equipment functions
properly.
2. Switch the fan on.
3. Checks:
♦ Direction of rotation/conveyance. The direction of rotation always applies looking at the rotor
♦ Smooth running (any vibrations and noise)
♦ Current consumption
♦ Tightness of all connections
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