Emerson VSG & VSSG Specifications Page 31

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Section 2 • Operational Descriptions
Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM
When a load limit or forced unload condition is active it
will be annunciated in the status banner on the overview
and menu HMI screens, and will also be logged in the
event list.
INHIBIT
LOAD
FORCE
UNLOAD TO
FORCE
UNLOAD AT
DISCHARGE
PRESSURE
OR AMPS
LOW SUCTION PRESSURE
A
B
C
D
INHIBIT
LOAD
FORCE
UNLOAD TO
FORCE
UNLOAD AT
HIGH DISCHARGE PRESSURE OR AMPS
A
B
C
D
(A) CAPACITY SLIDE WILL NOT INCREASE
(B & C) CAPACITY SLIDE WILL DECREASE UNTIL PRESSURE REACHES “C”
(D) CAPACITY SLIDE MAY INCREASE
(A) CAPACITY SLIDE WILL NOT INCREASE
(B & C) FORCED UNLOAD UNTIL DISCHARGE PRESSURE/AMPS REACHES “C”
(D) CAPACITY SLIDE ALLOWED TO INCREASE
SUCTION
PRESSURE
Figure 2-5. Operational Diagram - Load Limits / Forced Unloading (Example)
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