Emerson VSG & VSSG Specifications download pdf (Page 16)

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

Section 1 • General Information

Temperature of the compressor oil in the bottom of the

oil separator vessel.

Suction Oil Injection

Method of providing additional lubrication to large

frame compressors (models 2401-3001) at compressor

start.

Suction Pressure

Pressure of the refrigerant or gas measured at the inlet

of the compressor.

Suction Temperature

Temperature of the refrigerant or gas measured at the

inlet of the compressor.

Surge Drum or Suction Accumulator

Vessel where additional liquid refrigerant may accumu-

late to prevent liquid from getting into the compressor.

Temperature Transmitter

Device that measures temperature and transmits the

temperature reading as a 4-20mA signal. This 4-20mA

signal is read by the PLC and displayed as a temperature.

Trip

Compressor shutdown due to an abnormal process or

operational condition.

Venturi Oil Recovery

Method of recovering compressor oil from the chiller us-

ing solenoid valves on a cycle timer.

VFD

VFD stands for “Variable Frequency Drive.” A VFD is a

motor control device that can vary the speed of an AC

induction motor.

Volume Slide Valve

Internal mechanism in the compressor that controls the

amount of gas ﬂ owing into the compressor.

Volume Slide Valve Actuator

Drive motor that moves the volume slide valve, and

gives feedback on the position of the volume slide valve.

V-PLUS

V-PLUS stands for “Vilter Pumped Liquid Unitary

System.” It is a method of oil cooling where liquid refrig-

erant is pumped into the discharge line or housing by a

variable speed pump.

Outlet Scrubber Outlet Pressure

Pressure of gas measured at the outlet of the outlet

scrubber.

Outlet Scrubber Pressure Drop

Pressure differential between inlet and outlet of the out-

let scrubber. Calculated: Scrubber Inlet Pressure minus

Scrubber Outlet Pressure.

PID Controller

PID stands for “Proportional Integral Derivative.” A PID

controller manipulates a control variable (example: valve

position or fan/pump speed) to maintain a process vari-

able (example: process temperature or pressure) at a de-

sired value (setpoint). The controller is driven by math-

ematical calculations that tell the control variable how to

react to changes in the process variable.

PLC

PLC stands for “Programmable Logic Controller.” The

Compressor PLC is an industrial computer that controls

the compressor unit or Package.

Prelube Oil Pressure Calculated

Oil Filter Outlet (Manifold) Pressure minus Discharge

Pressure. Monitored at compressor start to ensure ad-

equate lubrication.

Pressure Ratio

The ratio of compressor discharge pressure to suction

pressure.

Pressure Ratio Calculated

(Discharge Pressure) / (Suction Pressure)

Pressure Transducer or Transmitter

Device that measures pressure and transmits the pres-

sure reading as a 4-20mA signal. This 4-20mA signal is

read by the PLC and displayed as a pressure.

Process Temperature

Temperature of the process ﬂ uid (liquid or gas, ex. natu-

ral gas, glycol, water) measured at the process outlet of

the chiller.

RTD

RTD stands for “Resistance Temperature Detector.”

RTDs use electrical resistance to measure temperature.

This resistance is read by the PLC and displayed as a

temperature.

Separator Oil Temperature

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Emerson VSG & VSSG Specifications Page 16

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