JOHNSON CONTROLS
119
SECTION 2 – OPTIVIEW CONTROL CENTER
FORM 160.69-O1
ISSUE DATE: 9/30/2012
2
“WARNING – CONDITIONS OVERRIDE VGD
#1”
(Software version C.MLM.11.02.xxx (and later) or
C.OPT.11.02.300 (and later)).
An extreme stall condition has been detected in com-
pressor #1 while it was running. An extreme stall con-
dition exists when the Stall Detector Voltage (output
of the Stall Detector Board) exceeds twice the HIGH
LIMIT setpoint for the duration programmed in the
EXTREME STALL DURATION Setpoint (10 to 20
minutes). While this message is displayed, compressor
#1 Variable Geometry Diffuser (VGD) is driven to the
full open (100%) position and held there until the mes-
sage is manually cleared. This protects the VGD ring
from possible damage from an extreme stall condition.
This message can be cleared after the Stall Detector
Voltage returns to less than two times the HIGH LIM-
IT Setpoint and the WARNING RESET key is pressed
in SERVICE access level.
The Extreme Stall condition is not checked under the
following conditions:
• While the VGD is in Manual control mode.
• While the VGD is fully closed (position is 0%)
(VGD Limit Switch closed).
• While the Pre-rotation vanes position is greater
than the PRV VGD INHIBIT Setpoint.
“WARNING – CONDITIONS OVERRIDE VGD
#2”
(Software version C.MLM.11.02.xxx (and later) or
C.OPT.11.02.300 (and later)).
An extreme stall condition has been detected in com-
pressor #2 while it was running. An extreme stall con-
dition exists when the Stall Detector Voltage (output
of the Stall Detector Board) exceeds twice the HIGH
LIMIT setpoint for the duration programmed in the
EXTREME STALL DURATION Setpoint (10 to 20
minutes). While this message is displayed, compressor
#2 Variable Geometry Diffuser (VGD) is driven to the
full open (100%) position and held there until the mes-
sage is manually cleared. This protects the VGD ring
from possible damage from an extreme stall condition.
This message can be cleared after the Stall Detector
Voltage returns to less than two times the HIGH LIM-
IT Setpoint and the WARNING RESET key is pressed
in SERVICE access level.
The Extreme Stall condition is not checked under the
following conditions:
• While the VGD is in Manual control mode.
• While the VGD is fully closed (position is 0%)
(VGD Limit Switch closed).
• While the Pre-rotation vanes position is greater
than the PRV VGD INHIBIT Setpoint.
“WARNING – HEAD PRESSURE – HIGH HEAD
LAG START LIMIT”
(Software version C.MLM.11.02.xxx (and later) or
C.OPT.11.02.300 (and later)).
Displayed when starting the Lag compressor while a
high head condition exists. A high head condition ex-
ists when the actual DELTA P/P is greater than the
HIGH HEAD DP/P LIMIT Setpoint. To minimize
surging while starting the lag compressor under this
condition, the lead compressor’s Pre-rotation Vanes
are driven closed coincident with the start of the Lag
compressor’s Pre-lube. They will be allowed to open
after the Lag compressor is running, the Lag Discharge
Valve is open and the Lead and Lag motor currents are
balanced within 5%.
“WARNING – ANTI SURGE – EXCESS SURGE
LIMIT”
(Applies to dual compressor operation only) The Pre-
rotation Vanes are being load limited because a surge
event has been detected while both compressors are
running. As a surge avoidance, a close signal is ap-
plied to both the lead and lag compressor vanes un-
til the lowest motor current is greater than or equal to
80% of the highest motor current. The load limit will
remain in effect until the lag compressor is shutdown,
whereupon the message is cleared.
“WARNING – ANTI SURGE – SURGE COUNT
EXCEEDED”
(Applies to dual compressor operation only) The Surge
Window Count exceeded the Count Limit while both
compressors were running. To prevent further surging,
a soft shutdown is performed on the lag compressor
when this warning is displayed. This message will be
displayed until manually cleared with the WARNING
RESET key in Operator (or higher) Access Level.
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