9 – 2
Section 9 • Step and PID Device Control Screens
Blower Package PLC Operation Manual •Vilter/Emerson • 35391BLP
Figure 9-2. Aftercooler (Step Type) Screen
AFTERCOOLER (STEP TYPE) SETPOINTS
• Start Aftercooler Above: De
fi
nes the temperature the
fi
rst aftercooler step will come on.
• Target Aftercooler Outlet Temperature: De
fi
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
fi
guration: Truth table that de-
fi
nes which fan outputs are turned on in each step.
Summary of Contents for Vilter PLC
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