Emerson VSG & VSSG Specifications download pdf (Page 100)

9 – 6

Section 9 • Step and PID Device Control Screens

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

Figure 9-6. Water Cooled Aftercooler Screen

WATER COOLED AFTERCOOLER SETPOINTS

• Open Valve Above: Deﬁ nes the temperature the af-

tercooler water supply valve will open to minimum

position.

• Target Aftercooler Outlet Temperature: Deﬁ nes the

desired temperature of gas at the outlet of the after-

cooler. The aftercooler water supply valve position

will adjust to maintain this temperature.

• Deadband: Range above and below setpoint where

the controller will not make adjustments to water

supply valve positon.

• 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 Valve Open: Deﬁ nes the minimum water

supply valve position.

• Aftercooler Valve Force: Allows the user to manu-

ally force the aftercooler water supply valve to a set-

table position. Activating the Aftercooler Valve Force

pushbutton will command the aftercooler water sup-

ply valve to go to the set position, and will override

calculations from the PID Controller.

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Emerson VSG & VSSG Specifications Page 100