Emerson VSG & VSSG Specifications download pdf (Page 23)

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Section 2 • Operational Descriptions

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

Overview

The following are standard equipment on all compressor

units or packages that can be controlled or monitored:

• Suction Pressure – Pressure of the gas measured at

the inlet of the compressor.

• Discharge Pressure – Pressure of the gas at the outlet

of the compressor. Measured at the oil separator.

• Oil Filter Inlet Pressure – Pressure of oil measured at

the inlet of the oil ﬁ lter(s).

• Oil Manifold Pressure (Oil Filter Out) – Pressure of oil

measured after the oil ﬁ lter(s).

• Prelube Oil Pressure (at compressor start, Oil

Manifold – Discharge Pressure)

• Net Oil Pressure (when compressor running, Oil

Manifold – Suction Pressure)

• Suction Temperature – Temperature of the gas mea-

sured at the inlet of the compressor.

• Discharge Temperature – Temperature of the gas and

oil mixture at the outlet of the compressor

• Separator Oil Temperature – Temperature of the oil in

the oil separator vessel.

• Oil Injection Temperature – Temperature of the oil as

it goes into the compressor.

• Capacity Slide Valve Position - % Travel of the capacity

slide valves.

• Volume Slide Valve Position - % Travel of the volume

slide valves.

• Main Motor Amperage – Current draw by the main

motor.

• Separator Oil Heaters

• Compressor Main Motor

• Oil Pump (Full Time or Part Time Selectable)

• Selectable groups of setpoints for varying operating

conditions

The following are additional software controls available

that are native to all compressor units controlled by the

compressor PLC:

• Monitoring of Instrument Data, Alarms, Trips, and

Machine Status by DCS/Central Controller

• Compressor Capacity control setpoint from DCS/

Central Controller

• Control of Compressor Loading/Unloading from

DCS/Central Controller

• Capacity control on External Pressure Transducer

data from DCS/Central Controller

• Auto Start/Stop based on process pressure or

temperature

• Control of Local/Remote from DCS/Central Controller

• Setpoint Group Selectable from DCS/Central

Controller

• Remote Starting and Stopping of the Compressor

• The following are optional compressor unit-speciﬁ c

items that can be controlled or monitored:

• Compressor Main Motor VFD Control

• Main Motor Winding Temperatures

• Main Motor Bearing Temperatures

• Motor Vibration (up to 2 sensors)

• Compressor Vibration (up to 2 sensors)

• Oil Separator Level Switch

• Suction Oil Injection Solenoid Valve (Used on Models

2401-3001)

• Suction-Discharge Equalizing Solenoid Valve

• Oil Drain Solenoid Valve

• Oil Separator Outlet Pressure, to calculate pressure

drop across coalescing elements of oil separator

• 2-Way Oil Mixing Valve

• Air Cooled Oil Cooler (Step or VFD Type)

• Oil Cooler Inlet/Outlet Temperatures

• Oil Cooler Standby Heater

The following are optional compressor unit and package

items that can be controlled or monitored, speciﬁ c to re-

frigeration applications:

• Air Cooled Condenser (Step Type or VFD Type)

• Evaporative Air Cooled Condenser

• Water Cooled Condenser

• Oil Injection Control Valve

• Liquid Injection Oil Cooling

• VPLUS Liquid Oil Cooling

• Economizer Port Solenoid Valves (single or dual)

• Hotgas Bypass Solenoid

• Venturi Oil Recovery

• Liquid Refrigerant Temperature – Temperature of the

liquid refrigerant in the chiller.

• Process Temperature – Temperature of the process

ﬂ uid leaving the chiller

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Emerson VSG & VSSG Specifications Page 23

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