Emerson VSG & VSSG Specifications download pdf (Page 88)

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Section 7 • Compressor Control Setpoints

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

AUTO START/STOP

• Auto Start Pressure: When discharge pressure is

above this setpoint for the Auto Start Delay Time, the

compressor will be commanded to start.

• Auto Stop Pressure: When discharge pressure is be-

low this setpoint and capacity slide position is below

Minimum Slide Position for the Auto Stop Delay time,

the compressor will be commanded to stop.

• Auto Start Delay: Amount of time Auto Start pres-

sure must be met before the compressor will be com-

manded to start.

• Auto Stop Delay: Amount of time Auto Stop pressure

must be met before the compressor will be com-

manded to stop.

• Minimum Slide Position: Slide position must be be-

low this setpoint (indicating the compressor is fully

unloaded) before the compressor will be command-

ed to stop.

MAIN MOTOR VFD

• Max Speed Increase/Decrease per interval: This is the

maximum amount the main motor speed command

may be adjusted by every time through the Load/

Unload Cycle timer.

• Forced Unload Rate: If a forced unload condition ex-

ists and the main motor is running above 50% speed,

this is the rate it will decelerate until it reaches 50%

speed and the capacity slide begins unloading.

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Emerson VSG & VSSG Specifications Page 88