Oil Sump Heater; Selection And Operation Of Compressors With Frequency Converters - BOCK HGX24e CO2 LT Series Assembly Instructions Manual

5| Electrical connection
Gauge state
1. Deactivated state
2. INT69 G switch-on
3. Remove PTC connector
4. Insert PTC connector
5. Reset after mains on

5.7 Oil sump heater

In order to avoid damage to the compressor, the compressor has to be equipped with an oil sump heater.
ATTENTION The oil sump heater must generally be connected and operated!
Operation: The oil sump heater operates when the compressor is at a standstill.
When the compressor starts up, the oil sump heating switches off.
Connection: The oil sump heater must be connected via an auxiliary contact (or parallel wired auxiliary
contact) of the compressor contactor to a separate electric circuit.
Electrical data: 220 - 240 V - 1 - 50/60 Hz, 80 W.

5.8 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. 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
The permissible frequency range can be found in the technical data chapter 8, p. 26.
Rotational speed
range
Start-up time
Switch-off time
f-min/f-max see chapter 8: Technical data: permissible frequency range
Relay position
11-12
11-14
11-12
11-12
11-14
0 - f-min
< 1 s
immediately
Relay position INT69 G
B2 12 14 11
Fig. 16
f-min - f-max
ca. 4 s
D
GB
F
E
19