Emerson VSG & VSSG Specifications Page 25

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Section 2 • Operational Descriptions
Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM
COMPRESSOR STARTUP SEQUENCE
IDLE
MOVE CAPACITY & VOLUME
SLIDES HOME
PERMISSIVES MET &
UNIT STARTED
STORE (MANIFOLD MINUS DISCHARGE)
PRELUBE DIFFERENTIAL PRESSURE
CAPACITY & VOLUME SLIDE
POSITION < 5% TRAVEL
START OIL PUMP
ADD 1 TO PRELUBE PUMP
START COUNTER. WAIT 5
SECONDS BETWEEN EACH
PUMP START
TRIP
PRELUBE
PUMP START
COUNTER = 3
START COMPRESSOR
PRELUBE NOT
SATISFIED AFTER OIL
PUMP RUNS FOR 10
SECONDS (SETTABLE)
PRELUBE PRESSURE
(MANIFOLD
DIFFERENTIAL
PRESSURE) SATISFIED
FOR 3 SECONDS
COMPRESSOR WARM-UP
OIL PUMP ON
START MODULATING VOLUME SLIDE
COMPRESSOR RUNNING
MODULATE CAPACITY SLIDE
OIL PUMP MAY STOP ON PRESSURE RATIO
PRELUBE PRESSURE
SATISFIED FOR 10 SECONDS
50 SECONDS DELAY BEFORE CAPACITY
SLIDE VALVES GO TO AUTO AND OIL
PUMP SHUTS OFF
7-15 MINUTE DELAY (MODELS 2401-3001
ONLY) BEFORE CAPACITY SLIDE
VALVES GO TO AUTO AND OIL PUMP
SHUTS OFF
COMPRESSOR STOP
TRIP
AUTO CYCLE OFF
TRIP
PRELUBE PRESSURE NOT
SATISFIED FOR 3 SECONDS
Figure 2-1. Compressor Startup Sequence Diagram
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