JOHNSON CONTROLS
68
FORM 160.69-O1
ISSUE DATE: 9/30/2012
SECTION 2 – OPTIVIEW CONTROL CENTER
Count Limit
Access Level Required: OPERATOR
Allows the user to define the maximum number of
surge events (2 to 8; default 3) that can occur within
the programmed Count Window period of time before
the lag compressor is taken off line. Each time a surge
occurs, the Surge Window Count is incremented. If the
Surge Window Count. If the number of surge events
within the Count window exceeds the Count Limit, the
lag compressor is taken off line and “Warning – Anti
Surge – Surge Limit Exceeded” is displayed. This will
be displayed until manually cleared with the Warning
Reset key.
Clear Surge Count
Access Level required: ADMIN
Allows user to reset dual compressor Total Surge
Count to zero.
High Head DP/P Limit
(Software version C.MLM.11.02.xxx (and later) or
C.OPT.11.02.300 (and later)).
Access Level Required: SERVICE
Specifies the Delta P/P head condition [(Condenser
pressure - Evaporator pressure) / Evaporator pressure],
above which the Lead compressor’s Pre-rotation Vanes
will be driven closed while the Lag compressor is start-
ing. This avoids surging during high head conditions.
Service Technicians refer to Service Manual 160.69-
M1.
Navigation
Home
Access Level required: VIEW
Causes an instant return to the Home Screen
Surge
Access Level Required: VIEW
Causes an instant return to the Main Surge Screen.
Lead Compressor
Identifies the compressor that has been assigned as the
lead compressor.
Lead % Full Load Amps
Displays the motor current of the lead compressor as
a percentage of the full load amps of that compressor
motor.
Lead Pre-rotation Vanes Position
Displays the position of the lead compressor pre-rota-
tion vanes position.
Lead Variable Geometry Diffuser Position
Displays the position of the lead compressor Variable
Geometry Diffuser.
Lag %Full Load Amps
Displays the motor current of the lag compressor as
a percentage of the full load amps of that compressor
motor.
Lag Pre-rotation Vanes Position
Displays the position of the lag compressor pre-rota-
tion vanes position.
Lag Variable Geometry Diffuser Position
Displays the position of the lag compressor Variable
Geometry Diffuser.
Programmable
Count Window
Access Level Required: OPERATOR
Allows the user to define the period of time (15 to
120 minutes; default 60) in which the number of surge
events are compared to the Count Limit threshold.
Each time a surge occurs, the Surge Window Count
increments. If the Surge Window count is less than or
equal to the Count Limit, a close signal is applied to
both compressor #1 and #2 Pre-Rotation Vanes until
compressor #1 motor current is within 20% of com-
pressor #2. While the vanes are closing, “Warning –
Anti Surge- Excess Surge Limit” is displayed until the
motor currents are balanced with 20%, whereupon it
automatically clears. If the Surge Window Count ex-
ceeds the Count Limit, the lag compressor is taken off
line and “Warning – Anti Surge –Surge Limit Exceed-
ed” is displayed. This is displayed until manually reset
with the Warning Reset Key.
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