3004355-2012-07-23.fm
GB - BESB – Product information
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1.4.2 Ventilator with frequency converter FC
General
Ventilators marked FC have a built-in frequency converter.
Cables
Cables for control signals must be screened. The wiring for control signal inputs must
be completely insulated from the supply wirings.
ESD
The electrician must be ESD protected when
• detaching the cover on the frequency converter
• working with the frequency converter
BESB250-4-1FC, BESB315-4-1FC, BESB400-4-1FC, BESB500-4-1FC
Diagram
Leakage current
When operating the FC-motor frequency converters have a leakage current of less than
3.5 mA. The leakage current must be earthed, as there is a risk of the motor becoming
live.
Earth leak circuit
breakers
Only Type-A earth leak circuit breakers can be used with one-phase FC motors, as
required by IEC755 (Amendment 2). The circuit breaker activates when faulty current is
registered with DC component. These circuit breakers are marked with:
Dimensioning of
the neutral
conductor.
Multiple one-phase BESB with FC installations in a shared network with a common
neutral, require special dimensioning of the neutral, as the current is not a pure sine
wave.
Example
For example if three FC motors are installed, sharing 3-phases, the neutral current is the
sum of the three motors’ current.
Existing
installations
If you are fitting motors to an existing installation, check that the neutral conductor can
cope with the resultant load.
Fig. 8
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