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4.9.2 Wiring with frequency converters
Typical wiring diagram:
Frequency converter with load measuring device, safety
switch and PTC resistor.
Consider the following if frequency converters are
used:
1. The fan motor must be designed for operation with a
frequency inverter.
2. The motor must be protected against overloading and
heating; i.e. have a PTC resistor, for instance. A switch-
type motor protection with bimetallic trip is not appro-
priate.
3. Shielded motor – PTC resistor cables must be run to the
frequency inverters.
4. The motor and fan must absolutely not exceed the max.
permissible speed.
5. In other respects, we refer to the maintenance instruc-
tions from each individual manufacturer of frequency
inverters.
14
www.swegon.com
Aux. contactor
Example: EMC-compatible installation
PLC etc.
Min. 16 mm
equalizing cable
Control lines
Line voltage
Min. 10 mm
2
The company reserves the right to make design changes without prior notice.
EN.SILVER.110322
Pressure sensor
Casing plate
2
Mount all the cables on
one side of the plate
Min. 200 mm
Motor cables
between control
lines, motor cables
and power cables
PE: Min. 10 mm
2
Output relay
Earthing strip
Remove the
cable insulation
Motor thermistor
Motor
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