Emerson VSG & VSSG Software Manual page 13

Compressor Operation with VFD Drive
Start
Compressor
Start VFD at
Minimum Speed
(30 Hz Typ.)
Check/Adjust Capacity Slide
Is Control Press.
Within Setpt No
Deadbands?
Yes
Check/Adjust VFD
Increase or Decrease Motor Speed
Is Control Press @
No
Setpoint?
Yes
Is Motor Speed @
No
Min?
No
Increase or Decrease the
Compressor Capacity Slides to
Match Setpoints
Increase or Decrease the
Compressor Capacity Slides to
Match Setpoints
@ Rate Defined by VFD PID
Parameters
Is Capslide @
100%
Yes
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