Emerson VSG & VSSG Specifications download pdf (Page 35)

Operation

The Motor Amps Load Limit protects the com-

pressor from overloading by decreasing the

compressor capacity if the motor amperage is

at the Maximum Amps setpoint, or preventing

an increase in capacity if the motor amperage is

above the Full Load Amps setpoint. (See Com-

pact Logix PLC manual, p/n 35391CL.)

3. Oil Separator Heater

The oil separator heater keeps the oil in the

separator from becoming too viscous and helps

keep gas from condensing in the receiver section

of the separator.

The heater is turned on only when the compres-

sor is off. The separator heater is supplied with

an integral temperature control.

B. Safety Setpoints

A detailed explanation of all safety setpoints can

be found in the Compact Logix PLC manual, p/n

35391CL.

1. Oil Pressure

Low oil pressure differential stops the compres-

sor unit when there is an insufficient difference

in pressure between the oil manifold and suc-

tion.

2. Discharge Pressure

High discharge pressure cutout stops the com-

pressor unit, when the discharge pressure in the

oil separator exceeds the setpoint.

3. Suction Pressure

Low suction pressure cutout stops the

compressor unit when the suction pressure

drops below the setpoint.

4. Oil Filter Differential

High oil filter differential cutout stops

the compressor unit when the difference

between the outlet and inlet of the filter

exceeds the setpoint.

5. Oil Temperature

The oil temperature cutout stops the com-

pressor unit when the oil temperature is too

high or too low.

6. Discharge Temperature

The high discharge temperature cutout

stops the compressor unit when the dis-

charge temperature exceeds the setpoint.

INITIAL START-UP

A. Setting of Controls

Refer to the Compact Logix PLC manual (p/n

35391CL) for a list of initial settings.

B. Valve Settings

1. The suction line uses separate stop and check

valves. Ensure the suction stop valve is open

prior to starting.

2. The ¼” suction equalization valve should be

closed during operation. The valve enables the

unit to slowly equalize to low side pressure dur-

ing off periods. This valve must be adjusted to

minimize oil loss when compressor stops.

3. The discharge line uses separate stop and check

valves. Ensure the discharge valve is open prior

to starting.

4. Manually open the oil isolating valve at the oil

separator outlet connection.

5. Open the isolating valve(s) before and after the

oil filter housings.

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Emerson VSG & VSSG Specifications Page 35

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