21
♦
Check if the data on the nameplate matches the
connection data.
♦
Complete the electrical connection according to the
circuit diagram.
♦
Use all of the locking screws.
♦
Insert the screws by hand to avoid damaging the
thread.
♦
Tighten all glands well in order to guarantee
protection class IP.
♦
Screw the lid of the terminal box/inspection switch
evenly tight.
♦
Connect the cable end in a dry environment.
♦
Install a circuit breaker in the permanent electrical
installation, with a contact opening of at least 3 mm
at each pole.
♦
Potentially, the fans may become charged with static
electricity. If this represents a risk, please contact
Systemair.
Protective grounding wire
The protective grounding must have a cross-section equal to or greater than that of the phase conductor.
Residual current circuit breaker
All-current-sensitive residual current circuit breakers are required for use in alternating-current systems with 50/60
Hz, in combination with electronic devices such as EC motors, frequency converters or uninterruptible power supplies
(UPS).
9.1
Protecting 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!
9.2
Variable-speed fans
Warning
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.
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.
♦
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.
♦
An all-pole sine filter is mandatory if the fan is operated with a frequency converter.
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