Version 2.02 15.05.2007
Function of VS 3000
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3.1 System configuration
The VS 3000 Pack Controller contains a low-pressure control loop (LP, compressor control) and a high-pressure
control loop (HP, condenser control). Two different temperature ranges are provided for compressor control (NT:
normal-temperature refrigeration or LT: low-temperature refrigeration; see also Section 2 - Application).
Compressor control largely covers the following control and regulating functions:
Low-pressure control (LP, compressor control) for single-circuit systems - step or combined control
S Load shedding
S Emergency power mode
S Base load rotation
S Compressor monitoring
S Safety loop
S D2D two-pipe discharge gas defrosting
High-pressure control (HP, condenser control) for single-circuit systems - step or speed control
3.2 Low-pressure control / Compressor control
S Step controller
- Control by loading and unloading compressor stages or compressor capacity stages
S Combined controller
- Control by variable-speed compressor in combination with one or more fixed-speed compressors
The setpoint is defined as a function of room (ambient) temperature. Actual values are detected by a pressure
transducer with continuous current output (4 to 20 mA) or voltage output (0 to 10 V).
3 Function of VS 3000
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