Emerson VSG & VSSG Specifications download pdf (Page 46)

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Section 2 • Operational Descriptions

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

level switch.

• The drain pump or solenoid valve will turn off

when the liquid level in the scrubber drops to the

“Cutout” level switch.

• Dual pumps may be used. Selection of Pump A or

B is made in the Conﬁ guration screen.

BUILDING ENCLOSURE DEVICES

If the compressor unit is mounted inside a building en-

closure, the following are monitored/controlled:

• Space Heater – maintains a desired temperature

range inside the enclosure. Space Heater ON and

OFF setpoints are in the compressor control setpoint

screens.

• Exhaust Fans – maintains a desired temperature

range inside the enclosure. Exhaust Fan ON and OFF

setpoints are in the compressor control setpoint

screens. If the methane detector %LEL reaches alarm

level, the exhaust fans will also turn on until the alarm

is cleared.

• Methane Detector – monitors the %LEL of the air

inside the enclosure. Generates an alarm and trip.

Alarm and trip setpoints are settable in the Alarm and

Trip Setpoints screen.

• Smoke Detector – If triggered by smoke within the

enclosure, will shut down the compressor and trip

the compressor emergency stop.

PERIODIC SLIDE VALVE EXERCISE

If used, the periodic slide valve exercise function moves

the slide valves if they have not moved for a settable

time to prevent them from sticking. This function ap-

plies to both capacity and volume slides.

• If the compressor is running, and the capacity slide

has not moved for the settable amount of time, the

exercise function will increase capacity slide posi-

tion by 10% (if its current position is less than 50%)

or decrease capacity slide position by 10% (if its cur-

rent position is greater than 50%). Once the slide has

been moved, the exercise function ‘releases’ slide to

operate to maintain desired pressure or temperature.

• If the compressor is running, and the volume slide

has not moved for the settable amount of time, the

exercise function will increase volume slide position

by 10% (if its current position is less than 50%) or de-

crease volume slide position by 10% (if its current po-

sition is greater than 50%). Once the slide has been

moved, the volume slide will return to the command-

ed position calculated by the controller.

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Emerson VSG & VSSG Specifications Page 46

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