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9 – 4

Section 9 • Step and PID Device Control Screens

Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM

Aftercooler Screens

Figure 9-4. Aftercooler (VFD Type) Screen

AFTERCOOLER (VFD TYPE) SETPOINTS

• Start Aftercooler Above: Deﬁ nes the temperature the

aftercooler fans will come on at minimum speed.

• Target Aftercooler Outlet Temperature: Deﬁ nes the

desired temperature of gas at the outlet of the after-

cooler. The aftercooler fan speed will adjust to main-

tain this temperature.

• Deadband: Range above and below setpoint where

the controller will not make adjustments to fan speed.

• PID Tuning: PID Calculations displayed to aid in tun-

ing the PID loop.

• Loop Update Time: Deﬁ nes the PID controller loop

time. The PID calculation will update every cycle of

the loop update timer.

• Proportional Gain (Kp): Deﬁ nes the Proportional

Constant of the PID calculation.

• Integral Gain (Ki): Deﬁ nes the Integral Constant of

the PID calculation.

• Derivative Gain (Kd): Deﬁ nes the Derivative Constant

of the PID Calculation.

• Minimum Speed: Deﬁ nes the minimum aftercooler

fan speed.

• Aftercooler VFD Force: Allows the user to manu-

ally force the aftercooler fan(s) to a settable speed.

Activating the Aftercooler VFD Force pushbutton

will command the aftercooler fan(s) to go to the set

speed, and will override calculations from the PID

Controller

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Emerson VSG & VSSG Spécifications Page 98