Emerson VSG Operation Manual page 11

Capacity Control Using Suction Pressure Control Setpoints
Start
Has
Decrease at Start
Yes
(Expired 15
sec.)
No
Wait
VSG/VSSG • Compact Logix PLC Manual •Vilter/Emerson • 35391CL
Operational Flow Charts
Are Motor
Amps >
Motor Amps Load Press > High Disch
No
Limit ON Setpt?
(Time Delay
10 sec)
Yes
Disable Cap Inc Disable Cap Inc
Are Motor
Amps >
Motor Amp Load Limit
OFF Setpt?
Yes
Dec Cap
No Change
(Timer)
Is Disch
Is Capacity
No > Min Run Cap
Press Unload
OFF Setpt?
OFF Setpt?
No
Yes
Increase Cap
(Timer)
Is Disch
Press > High Disch
Press Unload
ON Setpt?
Yes
Dec Cap
No Change
(Timer)
Is Suct
Inc Cap
Yes Press > Cap Inc Yes
(Timer)
ON Setpt?
No
Is Suct Press< Cap
No
Dec ON Setpt?
Yes
Dec Cap
(Timer)
11