Emerson VSG & VSSG Specifications Page 99

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9 – 5
Section 9 • Step and PID Device Control Screens
Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM
Figure 9-5. Aftercooler (Step Type) Screen
AFTERCOOLER (STEP TYPE) SETPOINTS
Start Aftercooler Above: De nes the temperature the
rst aftercooler step will come on.
Target Aftercooler Outlet Temperature: De nes the
desired temperature of gas at the outlet of the af-
tercooler. The controller will cycle fans on and off to
maintain this temperature.
• Deadband: Range above and below setpoint where
the controller will not add or remove any steps.
Step Dwell Time: Amount of time Aftercooler Outlet
Temperature must be outside the deadband to add
or remove a step.
Aftercooler Fan Con guration: Truth table that de-
nes which fan outputs are turned on in each step.
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