Capacity Regulator (Accessories); Selection And Operation Of Compressors With Frequency Converters - Danfoss BOCK UL-HGX66e Operating Manual

5 | Electrical connection

5.11 Capacity regulator (accessories)

5.12 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.
US
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. After 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 converter manufacturer.
Rotational speed
range
Start-up time
Switch-off time
f-min/f-max see chapter 9: Technical data: permissible frequency range
24 | AQ450438640296en-US0301
A fuse (max. 3xlB in accordance with IEC 60127-2-1) corresponding
to the rated current must be placed in front of every magnetic
coil of the capacity regulator as short-circuit protection. The ra-
ted voltage of the fuse must be equal to or greater than the rated
voltage of the magnetic coil. The ability of the fuses to switch off
must be greater than or equal to the maximum assumable short-
circuit current at the installation location.
0 - f-min
< 1 s
f-min - f-max
ca. 4 s
immediately
© Danfoss | Climate Solutions | 2024.04