JOHNSON CONTROLS
71
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
FORM 160.67-O1
ISSUE DATE: 4/1/2015
2
Mode (Auto/Manual)
Displays the present controlled status of the device.
Manual -> Auto Transfer Inhibit (LED)
Illuminates when the differential between the Auto
and Manual signals is greater than 5% indicating that a
transfer form the Manual mode to the automatic mode
is not allowed.
Speed Setpoint
Displays the present speed setpoint being sent to the
Speed Control PID Logic residing in the Frick ana-
log I/O board firmware. The Auto and Manual data
fields represent the % equivalent of the speed based
on 0-4500 RPM being equal to 0-100%. The PV data
field displays the highest of the two speed input signals
sensed by two magnetic pickups that monitor a toothed
gear installed on the turbine shaft.
Pre-Rotation Vanes
Displays the present control signal being sent to the
PRV position control logic controlling the Open/Close
digital outputs connected to the PRV actuator. The PV
data field displays the present position of the compres-
sor pre-rotation vanes as sensed by the potentiometer
on the vane operating shaft. This display will lag be-
hind the Pre-Rotation Vanes control signal display but
will eventually be within 1% of the Pre-Rotation Vanes
control signal display after the vane actuator has fin-
ished moving.
Hot Gas Bypass
Displays the present control signal being sent to the
analog output used to control Hot Gas Bypass Valve
actuator.
Subcooler Level
Displays the present control signal being sent to the
analog output used to control Subcooler Level Control
Valve actuator. The PV data field displays the present
refrigerant liquid level in the subcooler.
Hotwell Level
Displays the present control signal being sent to the
analog output used to control Hotwell Level Control
I/P Transducer. The PV data field displays the present
condensate level in the steam condenser.
Steam Inlet Valve
Displays the present control signal being set to the
analog output controlling the Main Steam Inlet Block
Valve. A 100% value represents a command for the
valve to open fully. This object only appears if MSSP4-
Turbine Start Mode is set for Auto and MSSP19 - Gov-
ernor Valve Location is set to Turbine on Configuration
Screen 1. The PV data field displays the steam pressure
measured at the inlet of the turbine between the trip
valve and the governor valve.
Slow Roll Valve
Displays the present control signal being set to the ana-
log output controlling the Steam Inlet Slow Roll By-
pass Valve. A 100% value represents a command for
the valve to open fully. This object only appears if MS-
SP4-Turbine Start Mode is set for Auto and MSSP19 -
Governor Valve Location is set to Turbine on Configu-
ration Screen 1. The PV data field displays the steam
pressure measured at the inlet of the turbine between
the trip valve and the governor valve.
PRV Motor Switch (Open/Closed)
Displays the status of the limit switch in the PRV ac-
tuator. The status will be Closed when the actuator has
moved to its fully counter clockwise position indicat-
ing that the vanes are completely closed.
When the PRV control signal is set to 0%
in the Manual mode, the vanes switch
may not be activated. Place the control
signal back to the auto mode to activate
this switch.
Anti-Surge Conditions - Head Pressure
Displays the present result of the condenser refrigerant
pressure minus the evaporator refrigerant pressure.
Anti-Surge Conditions – Min. PRV
Displays the present calculated minimum vane control
signal.
Anti-Surge Conditions – Min. Speed
Displays the present calculated minimum speed
setpoint.
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