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Emerson 20/20 service manual Compressor Control

Models: 20/20

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Section 6 • Compressor Control

operator consult PID tuning guides available from many different source before attempting to tune this PID.

Liquid inj. Setpoint 1:

•Setpoint at which the liquid solenoid will activate if in solenoid control or if the setting for the control vari- able for the PID is in liquid motorized value control.

Liquid inj. Setpoint 2:

• Not yet available

Oil Sep. Temp. Override:

•Defines the temperature the oil must reach before the liquid injection solenoid is allowed to be activated.

P = Proportional (Gain):

•Used to adjust the positioning valve in direct propor- tion to the difference between the control setpoint and the discharge temperature (SetPt - DT = error). The proportional term is a unit-less quantity and is used for coarse adjustment. This setpoint should be set to the lowest value that gives adequate response to the control system. Increasing the proportional setting increases the control system’s sensitivity to small discharge temperature fluctuations and the tendency to hunt.

I = Integral (reset):

•This parameter integrates the error over time, to ac- count for a small error that has persisted for a long time. This quantity is used for fine adjustment. This setpoint is used to smooth out discharge tempera- ture variations. This setpoint should be set high enough to prevent hunting but not too high or it will cause control system overshoot.

D = Derivative (rate):

•This parameter accounts for how fast the error is changing, positively or negatively.

Minimum Valve Open %:

•When enabled, this is the valve position used when- ever the control variable drops below Liquid inj. Setpoint 1. Use only if the compressor is tripping off for low oil temperature due to large overshoots and all other tuning methods have failed.

Avg. with Oil Manifold Temperature:

•When enabled, averages the Oil manifold tempera- ture and the discharge temperature. This creates a more stable control variable and should result in more stable control.

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Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

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Emerson 20/20 service manual Compressor Control
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