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SECTION 2 – OPTIVIEW CONTROL CENTER
VARIABLE GEOMETRY DIFFUSER (VGD) SCREEN
FIGURE 13 - VARIABLE GEOMETRY DIFFUSER 1 SCREEN
This screen displays information pertinent to the com-
pressor VGD operation. Also, the VGD can be manu-
ally controlled from this screen. Screens for VGD 1
and 2 are similar.
Animations for the diffuser ring are based on the Con-
trol Status: Probing – moves right to left (opening),
Stall Reacting or Surge reacting – left to right (clos-
ing), all other states – stopped and shown at a point
midway between full left and full right.
Animation for stall detection is shown in the diffuser
gap while a stall is occurring (Stall Detector voltage is
above the related High Limit threshold).
DISPLAY ONLY
Stall Detector Voltage
Displays the Stall Detector output voltage (x.xxVDC),
as received by the Microboard.
High Limit
Displays the High Stall Detector Voltage Limit. Set in
the VGD Setpoints Screen with Service Level Access.
Low Limit
Displays the Low Stall Detector Voltage Limit. Set in
the VGD Setpoints Screen with Service Level Access.
50
Mach Number
Displays the speed of the compressor.
(Mach Number = Tip Speed / Speed of Sound)
VGD Closed Limit Switch
Displays the status of the VGD Limit Switch. Dis-
played as CLOSED when the VGD is in the fully
closed position. Otherwise, displayed as OPEN.
VGD Opening (LED)
Illuminates when an open signal is being applied to the
VGD.
VGD Closing (LED)
Illuminates when a close signal is being applied to the
VGD.
VGD Position
Shows the position of the VGD. 0% to 100% open.
Maximum VGD Position
Shows the maximum calculated value that the VGD
will be allowed to open for the present condition. (0%
to 100%). Opening too far could cause surge.
FORM 160.79-O3
ISSUE DATE: 11/09/2018
LD27852
JOHNSON CONTROLS
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