Emerson Vilter Vission 20/20, Руководство по эксплуатации и обслуживанию

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19 – 6
Section 19 • Configuration
Vission 20/20 • Operation and Service Manual • Emerson • 35391SC 2.7
Compressor:
• Drop-down box to select the compressor type. This
selection is critical for proper volume slide control.
Model:
• Drop-down box to select the compressor size. This
selection is critical for proper volume slide control.
When the selection is VRS, such as in Figure 19-3, the
“Model” option becomes the compressor’s CFM.
Refrigerant:
• Drop-down box to select the type of refrigerant. This
selection is critical for proper volume slide control.
Compressor Control
Vilter TM compressors typically run in one of three con-
trol modes: Suction Pressure, Process Temperature or
Discharge Pressure Control, see Figure 19-2. Discharge
Pressure Control is mutually exclusive with Suction
Pressure Control & Process Control. When Discharge
Pressure Control is selected, Suction Pressure Control
and Process Control are grayed out and cannot be select-
ed. Similarly if Suction Pressure Control and/or Process
Control are selected, Discharge Pressure Control is
grayed out and cannot be selected.
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 Control:
•
This defines the Process Control input as the pro -
cess variable and all controls will be based on either
Process Temperature or Process Pressure. The op-
erator has the option to select up to two controllers
where each can have its own set of setpoints. The op-
erator has to select one of the process control modes,
either temperature or pressure, as a process variable.
Temperature and pressure configurations are mutu -
ally exclusive. The default setting will have tempera-
ture as process control variable.
Discharge Pressure Control:
•
This defines the discharge pressure input as the
process variable and all controls will be based on
discharge pressure. 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 19-2.
Compressor VFD:
• Enables the compressor motor’s VFD option.
Oil Restriction Solenoid:
• Enables the Oil Restriction Solenoid option.
Suction Superheat Monitor:
• Enables the suction superheat safety algorithms.
Suction superheat monitor works only with R717
and R507. Suction superheat monitor and Discharge
superheat monitor features are mutually exclusive.
Discharge Superheat Monitor:
• Enables the discharge superheat safety algorithms.
Discharge superheat monitor works only with R717.
Discharge superheat monitor and suction superheat
monitor features are mutually exclusive.
Condenser Control
The set of values in this section enables the condenser
control feature of the Vission 20/20. Once selected the
checkboxes will become available for selection and the
condenser control screen will be available via the menu
screen. Some of the options’ check boxes in this section
may not be available for selection unless the proper I/O
cards are installed and enabled, see Figures 19-2 and
19-3.
Ambient Sensor:
• Enables the ambient temperature option for the con-
denser control algorithm.
Wetbulb Sensor:
• Enables the wetbulb temperature override option for
the condenser control algorithm.
VFD Fan:
• Enables the VFD output option for the condenser
control algorithm.