Selection And Operation Of Compressors With Frequency Converters - Danfoss BOCK HG44e Series Operating Manual

5| Electrical connection
5.10 Selection and operation of compressors with frequency converters
For safe operation of the compressor, the frequency converter must be able to apply an overload of
at least 140% of the compressor's maximum current (I-max.) for at least 3 seconds.
When using frequency converters, the following things must also be observed:
1. The maximum permissible operating current of the compressor (I-max) (see type plate or
technical data) must not be exceeded.
2. If abnormal vibrations occur in the system, the affected frequency ranges in the frequency
converter must be blanked out accordingly.
3. The maximum output current of the frequency converter must be greater than the maximum
current of the compressor (I-max).
4. A fter each compressor start, run for at least 1 minute at a frequency of at least 50 Hz.
5. Carry out all designs and installations in accordance with the local safety regulations and common
rules (e.g. VDE) and regulations as well as in accordance with the specifications of the frequency
D
converter manufacturer
GB
The permissible frequency range can be found in the technical data.
F
E
Rotational speed
range
Start-up time
Switch-off time
f-min/f-max see chapter: Technical data: adjustable frequency range
24 | AQ451925859810en-000301
0 - f-min
< 1 s
immediately
f-min - f-max
ca. 4 s
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