Emerson VSG & VSSG Specifications download pdf (Page 103)

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Section 9 • Step and PID Device Control Screens

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

Figure 9-9. Water Cooled Condenser Screen

WATER COOLED CONDENSER SETPOINTS

• Open Valve Above: Deﬁ nes the pressure at which the

aftercooler water supply valve will open to minimum

position.

• Target Condensing Pressure: Deﬁ nes the desired

pressure of gas at the condenser. The condenser wa-

ter supply valve position will adjust to maintain this

pressure.

• 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.

• Condenser Valve Force: Allows the user to manually

force the condenser water supply valve to a settable

position. Activating the Condenser Valve Force push-

button will command the condenser water supply

valve to go to the set position, and will override cal-

culations from the PID Controller.

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Emerson VSG & VSSG Specifications Page 103