Emerson VSG & VSSG Specifications download pdf (Page 87)

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Section 7 • Compressor Control Setpoints

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

Figure 7-4. Compressor Control Screen - 1 of 3 (Discharge Pressure)

Compressor Control Setpoints Screen 1 - Discharge Pressure

The Compressor Control Setpoints page 1 (Discharge

Pressure) screen appears when navigating to

“Compressor Control Setpoints” from the menu screen

when Discharge Pressure control is selected. Setpoints

for desired discharge pressure, capacity slide valve con-

trol, auto start-stop, and main motor VFD are settable

within this screen. For more information and operational

descriptions, see section 2 “Operational Descriptions.”

The following groups of setpoints are settable. If mul-

tiple groups of setpoints are being used, the active

group of setpoints is designated by the “Setpoint 1” or

“Setpoint 2” text being shown in green. Auto Start/Stop

and Main Motor VFD Setpoints will appear if selected.

DISCHARGE PRESSURE CONTROL

• Target Discharge Pressure: This is the desired dis-

charge pressure the compressor will try to maintain.

• Upper and Lower Deadband: This is a range of

pressures above and below the Target Discharge

Pressure. Within this range, no capacity slide posi-

tion adjustments will be made.

• Upper and Lower Proportional Band: This is a range

of pressures above and below the Target Discharge

Pressure. Within this range, the controller will make

proportionally smaller adjustments to capacity slide

position.

CAPACITY SLIDE VALVE

• Load/Unload Interval time: This is the cycle time be-

tween making capacity slide position adjustments.

• Max Load/Unload Adjustment per interval: This is the

maximum amount the capacity position command

may be adjusted by every time through the Load/

Unload Cycle timer.

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Emerson VSG & VSSG Specifications Page 87