Function of VS 300
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Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
4.3 Low-pressure control / compressor control
When the control loop is configured as a low-pressure loop (compressor control), its purpose is to maintain low-
side pressure at a defined setpoint.
The VS 300 provides three different methods for these low-pressure control functions:
S Step controller:
Control by loading and unloading compressor stages or compressor capacity stages (single- and multi-stage
compressors).
S Speed controller:
Continuous control by speed adjuster for one or more compressors. Low-pressure control is made by an ana
log signal input to the speed adjuster for the required speed.
S Combined controller:
Control by combination of speed adjuster and additional loading/unloading of compressor capacity stages.
The VS 300 also provides the following functions for low-pressure control:
S Base load rotation of stages
S Monitoring functions
On the VS 300, actual values are detected by a pressure transducer delivering a continuous current output
(4-20 mA). Control type can be programmed on the integral user interface or by means of a terminal (AL 300 Oper
ator Terminal and CI 3000 Store Computer).
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