Variable Geometry Diffuser Setpoints Screen; Figure 23 - Variable Geometry Diffuser Setpoints Screen - York YK Style H Operation Manual

FORM 160.76-O2
issue date: 6/15/2015

VARIABLE GEOMETRY DIFFUSER SETPOINTS SCREEN

FIGURE 23 - VARIABLE GEOMETRY DIFFUSER SETPOINTS SCREEN

OVERVIEW
The Variable Geometry Diffuser setpoints are main-
tained on this screen. All setpoints require a login ac-
cess level of Service.
Requires a login access level of SERVICE.
Service Technicians refer to the OptiView
Control Center - Service Instructions
(Form 160.76-M1) for operation instruc-
tions and explanation of all programmable
setpoints and displayed values.
DISPLAY ONLY
Stall Detector Voltage
Displays the Stall Detector output voltage, as received
by the Microboard.
High Limit
(0.5 to 1.2VDC; default 0.6VDC; Specifies the Stall
Detector Board output voltage that represents an ac-
ceptable amount of stall noise.
Low Limit
(0.4 to 0.8VDC; default 0.5VDC; In the Stall Reacting
State, the VGD is driven closed until the Stall Detector
Board output voltage decreases to this level.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
The minimum difference between the High Limit
Setpoint and the Low Limit Setpoint is 0.1VDC. If
a Low Limit Setpoint is entered which is less than
0.1VDC below the High Limit Setpoint, the High Lim-
it Setpoint is adjusted so that it is 0.1VDC above the
newly entered Low Limit value.
Mach Number
Displays the compressor calculated mach number (gas
flow velocity), based on drive speed and suction condi-
tions.
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, displayed as OPEN.
VGD Opening (LED)
Illuminates when an open signal is being applied to the
VGD.
VGD Closing (LED)
Illuminates when a close signal is being applied to the
VGD.
LD19456
71
2