Emerson VSG & VSSG Specifications download pdf (Page 24)

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Section 2 • Operational Descriptions

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

The following are optional compressor unit and package

items that can be controlled or monitored, speciﬁ c to

gas compression applications:

• Up to 2 Aftercoolers

• Air Cooled Step Type

• Air Cooled VFD Type

• Water Cooled

• Inlet Scrubber

• Pressure Drop across vessel

• Condensate Drain

• Low/High Level Safety Switches

• Outlet Scrubber

• Pressure Drop across vessel

• Condensate Drain

• Low/High Level Safety Switches

• Discharge Recycle Valve

• Building Enclosure Devices

• Space Heaters

• Roof Exhaust Fans

• Methane %LEL Detector

• Oil Separator Gas Outlet Temperature – Temperature

of the gas measured at the discharge of the oil sepa-

rator. Used to monitor the temperature of the gas

relative to dew point. If the compressor is warm and

this temperature is too low, the controller will gener-

ate an alarm.

• Oil Separator Gas Outlet Pressure – Pressure of the

gas measured at the discharge of the oil separator.

Used to monitor the pressure drop across the co-

alescing elements of the oil separator. When pres-

sure drop is too high, the controller will generate an

alarm.

• Reheater Vessel and shell/tube side Temperatures –

Temperature of the gas measured at the discharge of

both the shell and tube sides of the reheater vessel.

• Periodic Slide Valve Exercising

Operational Descriptions and

Diagrams

STARTING OF THE COMPRESSOR/PERMISSIVES

To run the compressor, it must me started from the

“Start Menu” screen on the control panel HMI. Pressing

“Unit Start” in the “Start Menu” screen will initiate a start

if all permissives to initiate a start are met. To initiate a

start, the following conditions must be met:

• Control Power is ON (Emergency Stop button is not

pressed, Master Control Relay is energized or activat-

ed by remote device, indicated by pilot light on front

of panel)

• No Active Trips

When a start is initiated, the compressor will start if all

permissives to run the compressor are met. If all permis-

sives to run the compressor are not met, the control will

wait in a “standby” mode until all conditions to run are

satisﬁ ed. Any condition that the control is waiting on

is annunciated on the overview and menu screens and

logged in the Event List. To begin the compressor start-

up sequence, the following conditions must be met:

• Control Power is ON (Emergency Stop button is not

pressed and Master Control Relay is energized, indi-

cated by pilot light on front of panel)

• No Active Trips

• Compressor start has been initiated by pressing “Unit

Start” in the “Start Menu” screen.

• Remote Permissive input is ON

• Soft run permissive from the DCS/Central Controller

is ON (if control by communications selected)

• Anti-Recycle Timer is not active

• Suction – Discharge is equalized to within a settable

differential

• Auto Start control is calling for the compressor to

start, if Auto Start/Stop is Enabled.

If a start is initiated at the compressor, the machine state

indicator will indicate “Standby” and the condition the

compressor is waiting on will be annunciated on the

overview and menu screens.

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Emerson VSG & VSSG Specifications Page 24

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