Emerson VSG & VSSG Specifications download pdf (Page 38)

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Section 2 • Operational Descriptions

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

START

STEP #

TARGET

TEMPERATURE OR

PRESSURE

STEP #

TARGET

DEADBAND

TEMPERATURE OR

PRESSURE

1 STEP ADDED

EVERY CYCLE OF

CYCLE TIMER

NO STEPS ADDED

OR REMOVED

1 STEP REMOVED

EVERY CYCLE OF

CYCLE TIMER

FANS TURNING ON FANS TURNING OFF

Figure 2-11. Operational Diagram - All Air Cooled Oil Coolers (Step Type)

AIR COOLED OIL COOLER (STEP TYPE)

Reference Figure 2-11

If installed, the step type air cooled oil cooler is a heat

exchanger that uses multiple fans to control the oil tem-

perature at its outlet.

The controller starts and stops fans in a sequence to con-

trol the temperature at the outlet of the oil cooler. When

the temperature of the oil at the outlet of the cooler

exceeds the desired temperature plus a deadband, fans

will be turned on after a time delay to add more cooling.

When outlet temperature drops below the desired tem-

perature minus a deadband, fans will be turned off after

a time delay.

• When the compressor is stopped, all oil cooler fans

are turned off.

• When the compressor is running and the oil cooler

OIL COOLER

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Emerson VSG & VSSG Specifications Page 38