Variable Geometry Diffuser Screen; Figure 22 - Variable Geometry Diffuser Screen - York YK Style H Operation Manual

FORM 160.76-O2
issue date: 6/15/2015

VARIABLE GEOMETRY DIFFUSER SCREEN

FIGURE 22 - VARIABLE GEOMETRY DIFFUSER SCREEN

OVERVIEW
This screen displays information pertinent to the VGD
operation. Also, the VGD can be manually controlled
from this screen.
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.
Mach Number
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.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
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.
Surge Avoidance Surge Detected (LED)
Illuminates momentarily when a surge is detected by
the Surge Protection feature. If equipped with a VSD
or MV VSD, these are only the surges detected while
the drive is running at maximum frequency.
LD19455
69
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