Variable Geometry Diffuser (Vgd) Screen; Figure 14 - Variable Geometry Diffuser (Vgd) Screen - York YST Operation Manual

FORM 160.67-O1
ISSUE DATE: 4/1/2015

variable geoMeTrY diffuSer (vgd) SCreen

noTe: OptiView™ Control Center Screens shown may NOT represent the exact screens according to the software version utilized.

figure 14 - variable geoMeTrY diffuSer (vgd) SCreen

overvieW
This screen is only available if the VGD was enabled
on the Operations Screen. It displays all information
pertinent to the operation of the VGD. 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.
pre-rotation vanes position
Displays the position of the Pre-rotation vanes over
the range of 0% (fully closed) to 100% (fully open).
Displayed as XXX until calibration procedure is per-
formed by Service Technician.
diffuser gap Close (led)
Illuminates when a close signal is being applied to the
VGD.
diffuser gap open (led)
Illuminates when an open signal is being applied to the
VGD.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
vgd Count
Displays the number of times the Stall Detector Board
output voltage goes above the High Limit setpoint. The
count can be cleared with in ADMIN access level us-
ing the VGD Cycle Count key on the VGD Setpoints
Screen.
vgd Time ( __days __hrs __Min __Sec)
Displays the accumulated time the Stall Detector Board
output voltage is greater than the High Limit Setpoint
while the chiller is running.
Control Status
Appears when the VGD control is enabled after the
transition to the "System Run" mode. Displays the
current state of the VGD control. The states are: Stall
Waiting, Stall Reacting, Probing, Sensor Override.
limit Switch
Displays the status of the CCW limit switch in the VGD
actuator. The status will change from Open to Closed
when the VGD reaches its fully closed position.
Time remaining
While the VGD is in the Stall Waiting State, displays
the time remaining in the "Probe Wait Time" interval
(value programmed as the Probe Wait Time Setpoint).
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