Section 19 • Configuration
Compressor Control
Vilter compressors typically run in one of two control modes, suction pressure or process temperature con- trol, see Figure
Suction Pressure Control:
•This defines the suction pressure input as the pro- cess variable and all controls will be based on suction pressure. The operator has the option to select up to two controllers where each can have its own set of setpoints.
Process Temp. Control:
•This defines the process temperature input as the process variable and all controls will be based on the process temperature. The operator has the option to select up to two controllers where each can have its own set of setpoints.
Optional Function Selection
The following options are additional features of the Vission 20/20 that can be selected. Some of these op- tions will not be available for selection unless the proper I/O cards are installed and enabled, see Figure
Compressor VFD:
•Enables the compressor motor VFD option. % Slide Volume Position:
•Unused.
Economizer Pressure:
•Enables the economizer pressure input. Superheat Monitor:
•Enables the superheat safety algorithms.
Figure 19-2. Configuration Screen - Page 2
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