3.3 Speed controlled compressor
Fig.3: Speed controlled compressor with control electronics
Speed-controlled compressor adapts to the required cooling power with variable rotary
speed. As a result the compressor works efficiently and saves energy.
Compressor has a 3-phase AC motor with specified rotation direction.
Inverter prevents starting current peaks and creates a high level of torque. In case of
overload on system side, the inverter reduces capacity first of all and thus the rotary
speed, and then switches off the compressor.
In case of low rotary speed - compressor can vibrate, in case of high rotary speed -
high-frequency noises are possible.
There are two different types of speed control:
¡ Frequency-controlled - control module sends frequency signal to the inverter,
which controls the compressor speed in accordance with the ratio n [rpm] = f [Hz] x
k.
¡ Drop-in - control module sends an On / Off signal to the inverter, which controls
compressor speed in accordance with the power consumption of the compressor.
Design and function
2020-08-03_58300000002379_ara_en_p Copyright by BSH Hausgeräte GmbH Page11of73
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