Variable Geometry Diffuser Screen; Figure 20 - Variable Geometry Diffuser Screen - York YK-EP B Operation & Maintenance Manual

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION

VARIABLE GEOMETRY DIFFUSER SCREEN

FIGURE 20 - 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.
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 per-
formed by Service Technician.
56
VGD Closed Limit Switch
Displays the status of the VGD Limit Switch. Dis-
played 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.
ACC Surge Detected (LED)
Only displayed if equipped with a VSD or MVVSD.
Illuminates momentarily when a surge is detected by
the ACC function in the Microboard, while the drive is
running at less than maximum frequency.
FORM 160.87-OM1
ISSUE DATE: 8/24/2018
LD15427
JOHNSON CONTROLS