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
Содержание Omni
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