GEA Omni - Variable; Operating Modes; Fig. 114 Reverse Acting Capacity Control; Variable VI

fig.114: Reverse acting capacity control
CV Control Value
SP Set point
DB Dead Band
PB Proportional Band
PP Pulse Period
LP Load Pulse
UP Unload Pulse
LD Compressor Loading
UL Compressor Unloading
If the value of the control signal exceeds the set point, the compressor will use unload pulses to move the slide
valve. Conversely, if the value of the control signal falls below the set point, the compressor will use load pulses
to move the slide valve.
3.12 Variable Vi
GEA Grasso compressors may be configured for continuous variable Vi control. The type variable Vi control
used in a given project is dependent on the manufacturer and model of the compressor. These options are set in
the Package Details section of the Compressor Configuration.
3.12.1 Operating Modes
1.
Automatic
In this operation mode, Vi control will be handled automatically by the panel without user input.
2.
Manual
In this operation mode, the compressor capacity is controlled directly by the operator while Vi control is han-
dled automatically by the panel.
Instruction Manual | GEA Omni™
Control panel
Control
Variable Vi
GEA Refrigeration North America, Inc. | E_806550_2 | Generated 12.01.2016 201