SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
JOHNSON CONTROLS
67
FORM 160.54-O1
ISSUE DATE: 9/10/2014
2
next 10 minutes. While this load inhibit is in effect,
WARNING – SURGE PROTECTION – EXCESS
SURGE LIMIT is displayed. When 10 minutes have
elapsed, the warning message and load inhibit are auto-
matically cleared, provided the Surge Window Count is
less than or equal to the Count Limit. If the Shutdown
Setpoint is Enabled, and the Surge Window Count ex-
ceeds the Count Limit at the completion of this period,
a safety shutdown is performed and Surge Protection
– Excess Surge is displayed.
If the Hot Gas Bypass control is Enabled, the Hot Gas
Bypass Valve position must be 100% before the Extend-
ed Run mode is implemented. If the chiller is equipped
with a Compressor Motor Variable Speed Drive, output
frequency must be at full speed (50Hz/60Hz) before
the Extended Run mode is implemented. If the chiller
is equipped with both Hot Gas Bypass and Compres-
sor Motor Variable Speed Drive, both of the conditions
must be met before Extended Run is implemented.
Count Window
Access Level Required: OPERATOR
Allows the user to define the period of time (1 to 5
minutes; default 5; default 3 with software version
C.MLM.01.09.xxx (and later) or C.OPT.01.09.301
(and later)) in which the number of surge events (Surge
Window Count) are compared to the maximum al-
lowed (Count Limit), for the purpose of detecting an
Excess Surge situation.
Count Limit
Access Level Required: OPERATOR
Allows the user to define the maximum number of surge
events (4 to 20; default 4 ;default 15 with software ver-
sion C.MLM.01.09.xxx (and later) or C.OPT.01.09.301
(and later)) that can occur within a defined period of
time before an Excess Surge situation is detected. If the
Surge Window Count exceeds the Count Limit, an Ex-
cess Surge situation has occurred.
When an Excess Surge situation is detected, the action
depends upon the following:
• If both the Shutdown and Extended Run Setpoints
are Disabled, the chiller will continue to run,
displaying the message WARNING – EXCESS
SURGE DETECTED. Refer to Hot Gas Bypass
and Variable Speed Drive exceptions. See Shut-
down (Enabled/Disabled) on Page 66 and Ex-
tended Run (Enabled/Disabled) on Page 66.
• If the Shutdown Setpoint is Enabled and the Extend-
ed Run Setpoint is Disabled, the chiller will perform
a safety shutdown and display Surge Protection –
Excess Surge. Refer to Hot Gas Bypass and Variable
Speed Drive exceptions. See Shutdown (Enabled/
Disabled) on Page 66 and Extended Run (En-
abled/Disabled) on Page 66.
• If the Shutdown Setpoint is Disabled and the Ex-
tended Run Setpoint is Enabled, the Pre-rota-
tion Vanes are driven closed for 10 minutes and
WARNING – SURGE PROTECTION – EXCESS
SURGE LIMIT is displayed. When the 10 min-
utes have elapsed, if the Surge Window Count is
less than or equal to the Count Limit, this message
and load inhibit are automatically cleared. Alternat-
ing with this message is WARNING – EXCESS
SURGE DETECTED that continues after the 10
minute period has elapsed until manually cleared
with the WARNING RESET key. Refer to Hot Gas
Bypass and Variable Speed Drive exceptions. See
Shutdown (Enabled/Disabled) on Page 66 and
Extended Run (Enabled/Disabled) on Page 66.
• If both the Shutdown and Extended Run Setpoint
are Enabled, the 10 minute Extended Run mode
is invoked as described above. However, if the
Surge Window Count exceeds the Count Limit
at the completion of the 10 minute Extended Run
period, a safety shutdown is performed and Surge
Protection – Excess Surge is displayed. Refer to
Hot Gas Bypass and Variable Speed Drive excep-
tions. See Shutdown (Enabled/Disabled) on Page
66 and Extended Run (Enabled/Disabled) on
Page 66.
Surge Sensitivity
Access Level Required: SERVICE
Allows the user to define the surge detection sensitivity
of the Surge Protection feature. The Surge Sensitivity
Setpoint on the ACC DETAILS Screen sets the sensi-
tivity of the ACC Surge Detection feature that is em-
ployed for ACC Surge Detection when configured in
MODBUS serial communications protocol. Selectable
over the range of 0.3 to 1.3; default 0.3. The smaller the
number, the greater the sensitivity.
Clear Surge Count
Access Level Required: ADMIN
Allows user to set the Total Surge Count to zero.
To Next Page
Loading...
Need help?
General
