Emerson VSG & VSSG Specifications download pdf (Page 105)

9 – 11

Section 9 • Step and PID Device Control Screens

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

Figure 9-11. Liquid Injection (VPLUS Pump) Screen

LIQUID INJECTION (VPLUS PUMP) SETPOINTS

• Start Pump At: Deﬁ nes the temperature at which the

VPLUS pump will start at its minimum speed.

• Target Discharge Temperature: Deﬁ nes the desired

temperature of gas and oil discharging from the com-

pressor. The VPLUS pump will adjust speed to main-

tain this temperature.

• Deadband: Range above and below setpoint where

the controller will not make adjustments to the

VPLUS pump speed.

• Oil Separator Override Temperature: Separator Oil

Temperature must be above this temperature for the

VPLUS pump to operate.

• 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 Pump Speed: Deﬁ nes the minimum speed

of the VPLUS pump.

• VPLUS Pump Force: Allows the user to manually force

the VPLUS pump to a settable speed. Activating the

VPLUS Pump Force pushbutton will command the

VPLUS pump to go to the set speed, and will override

calculations from the PID Controller.

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Emerson VSG & VSSG Specifications Page 105