Variable Geometry Diffuser Screen - York YK-EP Operation And Maintenance Manual

Variable Geometry Diffuser screen

Figure 21: VGD screen
This screen displays information pertinent to the VGD operation. Also, the VGD can be manually
controlled from this screen.
Table 50: Display only
Field/LED name
Stall Detector Voltage
Discharge Pressure
Condenser Pressure
Pre-Rotation Vanes Position
VGD Closed Limit Switch
Diffuser Gap Close (LED)
Diffuser Gap Open (LED)
Surge Avoidance Surge
Detected (LED)
64
Description
Displays the Stall Detector output voltage (x.xxVDC), as received by
the Microboard.
Displays the Discharge Pressure.
Displays the Condenser Pressure.
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 performed by Service Technician.
Displays the status of the VGD Limit Switch. Displayed as CLOSED
when the switch is closed. This would be when the VGD is in the fully
closed position. Otherwise, it is displayed as OPEN.
Illuminates when a close signal is being applied to the VGD.
Illuminates when an open signal is being applied to the VGD.
Illuminates momentarily when a surge is detected by the Surge
Protection feature. If equipped with a VSD or MVVSD, these are
only the surges detected while the drive is running at maximum
frequency.
YK-EP Style B Centrifugal Chiller