West Control Solutions Pro-EC44 - Manual (Page 237)

Pro-EC44 2-Loop Graphical Profile Controller & Recorder
Pro-EC44 Product Manual - 59540-1 October 2013 Page 230
Sensor Break Pre-Set Power
If a thermocouple or RTD is disconnected or breaks, the instrument detects the condition
within 2 seconds, and sets the control loops output(s) to a value defined by the sensor break
pre-set power parameter in the control configuration sub-menu. Process, band and deviation
alarms behave as though the PV has gone high.
Non-zero based linear inputs (e.g. 2 to10V or 4 to 20mA, but not 0 to 20mA) also detect
sensor break conditions and set the same pre-set power value, but alarms behave as though
the PV has gone low.
Also refer to: Input Range; Linear Input; RTD and Thermocouple.
Serial Communications Configuration
A sub-menu of configuration mode used to adjust the serial communications parameters
(addressing, data rate, parity, master/slave settings and write enabling).
Also refer to: Configuration Mode and Serial Communications
Serial Communications Option
An optional feature that allows other devices such as a PC, PLC or master controller, to read
and change instruments parameters via an RS485 or Ethernet network.
Full details can be found in the Serial Communications sections of this manual.
Also refer to: Ethernet; Master & Slave; Modbus RTU; Modbus TCP; PLC; RS485 and Serial
Communications Configuration.
Set Valve Closed Position
When valve position indication is used in valve motor drive control mode, this parameter
defines the input value that is measured by the 2
nd
input when the valve is fully closed. The
valve must be
driven to its “Closed” end stop before setting this parameter.
It must not be used to limit valve movement; separate Valve Close and Open Limit
parameters are available for this purpose.
Also refer to Auxiliary Input; Set Valve Opened Position; Valve Close Limit; Valve Open Limit;
Valve Motor Control and Valve Position Indication.
Set Valve Opened Position
When valve position indication is used in valve motor drive control mode, this parameter
defines the input value that is measured by the 2
nd
input, when the valve is fully opened. The
valve must be driven to its “Open” end stop before setting this parameter.
It must not be used to limit valve movement; separate Valve Close and Open Limit
parameters are available for this purpose.
Also refer to Auxiliary Input; Set Valve Closed Position; Valve Close Limit; Valve Open Limit;
Valve Motor Control and Valve Position Indication.
Setpoint
The target value at which the instrument attempts to maintain the process, by adjusting its
control output power (the correcting variable). There are two setpoints for each control loop.
A main local setpoint and an alternate setpoint that can be another local setpoint or a remote
setpoint input from an auxiliary input. One setpoint at a time is chosen to be active using the
setpoint selection, or if the profiler is fitted it can set the actual setpoint value over time.
Setpoint values are always limited by the setpoint limits.
Also refer to: Alternate Setpoint; Auxiliary Input; Correcting Variable; Local Setpoints;
Process Variable; Profiler; Remote Setpoint; Scaled Input Lower Limit; Setpoint Lower Limit;
Setpoint Upper Limit and Setpoint Select