Emerson VSG & VSSG Specifications download pdf (Page 96)

9 – 2

Section 9 • Step and PID Device Control Screens

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

Figure 9-2. Oil Cooler (VFD Type) Screen

OIL COOLER (VFD TYPE) SETPOINTS

• Start Oil Cooler Above: Deﬁ nes the temperature the

oil cooler fans will come on at minimum speed.

• Target Oil Cooler Outlet Temperature: Deﬁ nes the de-

sired temperature of oil at the outlet of the oil cooler.

The oil cooler fan speed will adjust to maintain 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 oil cooler fan

speed.

• Plenum Heater ON Temp: Deﬁ nes the oil cooler out-

let temperature at which the oil cooler plenum heater

turns ON (if used).

• Plenum Heater OFF Temp: Deﬁ nes the oil cooler out-

let temperature at which the oil cooler plenum heater

turns OFF (if used).

• Oil Cooler Fan VFD Force: Allows the user to manu-

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

Activating the Oil Cooler Fan VFD Force pushbutton

will command the oil cooler fan(s) to go to the set

speed, and will override calculations from the PID

Controller.

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Emerson VSG & VSSG Specifications Page 96