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 Description
Stall Detector Voltage
Displays the Stall Detector output voltage (x.xxVDC), as received by
the Microboard.
Discharge Pressure Displays the Discharge Pressure.
Condenser Pressure Displays the Condenser Pressure.
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 performed by Service Technician.
VGD Closed Limit Switch
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.
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.
Surge Avoidance Surge
Detected (LED)
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 Chiller64
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