Variable Geometry Diffuser Setpoints Screen; Figure 15 - Variable Geometry Diffuser (Vgd) Setpoints Screen - York YST Operation Manual

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

variable geoMeTrY diffuSer SeTpoinTS SCreen

noTe: OptiView Control Center Screens shown may NOT represent the exact screens according to the software version utilized.
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figure 15 - variable geoMeTrY diffuSer (vgd) SeTpoinTS SCreen

overvieW
This screen is only available if the VGD was enabled
on the Operations Screen. The Variable Geometry Dif-
fuser setpoints are maintained on this screen. All set-
points require a login access level of Service.
diSplaY onlY
Stall detector voltage
Displays the Stall Detector output voltage (x.xxV), 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 reset with an ADMIN access level
using 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, and 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.
Condenser pressure voltage
Displays the DC voltage from the condenser pressure
transducer.
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