York OPTIVIEW Operation Manual page 50

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
DISPLAY ONLY
Active Stall Voltage
Displays the Stall Detector output voltage (x.xxVdc),
as received by the Microboard.
Active Stall Voltage Type
Displays STANDARD or ENHANCED to indicate
whether the Active Stall Voltage has enhanced filtering
applied when necessary to normalize flow noise.
Active High Limit
Displays the present value of the stall voltage High
Limit to which the control compares the stall detector
voltage input to determine appropriate reaction with
the VGD. This limit varies according to drive speed
and suction conditions.
Active Low Limit
Displays the present value of stall voltage Low Limit
to which the control compares the stall detector voltage
input to determine appropriate reaction with the VGD.
This limit varies according to drive speed and suction
conditions.
Mach Number
Displays the compressor calculated mach number,
based on drive speeed and suction conditions.
VGD Closing (LED)
Illuminates when a close signal is being applied to the
VGD.
VGD Opening (LED)
Illuminates when an open signal is being applied to the
VGD.
VGD Position
Displays the position of the VGD over the range of 0%
(fully closed) to 100% (fully open). Displayed as XXX
until calibration procedure is performed by a Service
technician.
Maximum VGD Position - Gas Path Revision
"A" Only
Displays calculated limit that the VGD is permitted to
open to in probing mode.
VGD Command - Gas Path Revision "B" Only
Displays the position command from the control to
the VGD.
50
Surge Detected (LED)
Illuminates for 5 seconds each time a surge is detected.
VGD Count
Displays the number of times the Stall Detector Board
output voltage goes above the High Limit setpoint. The
count can be cleared with in 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.
VGD Control State
Displays the current state of the VGD control. The
states are: Stall Waiting, Stall Reacting, Probing - Gas
Path A, Capacity Control - Gas Path B, Surge Reacting,
Surge Waiting, and Manual.
PROGRAMMABLE
Surge React Time
Specifies the length of the close pulse applied to the
VGD in response to a surge. (1-30 seconds; default 5)
Surge Wait Time
Specifies the length of the wait state before entering
the probing state. (0.5-5 minutes)
Probe Wait Time
Specifies how long the VGD control remains in the
Stall Waiting state before entering the Probing state.
(0.5-15 minutes; default 10)
Open Pulse
Specifies the length of the open pulse applied to the
VGD during 10 second periods while in the Probing
state. (1-9 seconds; default 2)
High Limit
Specifies the Stall Detector Board output voltage base-
line used by the stall control to determine when to initi-
ate action. This value represents an acceptable amount
of stall noise. (0.35-1.2VDC; default 0.50)
The minimum difference between the High Limit
setpoint and the Low Limit setpoint is 0.1 VDC. If a
Low Limit setpoint is entered which is less than 0.1
VDC below the High Limit setpoint, the High Limit
setpoint is adjusted so that it is 0.1VDC above the new-
ly entered Low Limit value.
FORM 160.78-O2
ISSUE DATE: 5/22/2017
JOHNSON CONTROLS