West Control Solutions Pro-EC44 - Manual (Page 216)

Pro-EC44 2-Loop Graphical Profile Controller & Recorder
Pro-EC44 Product Manual - 59540-1 October 2013 Page 209
Calibration
Adjustment or correction of the displayed values relative to the actual measured values.
Refer to the User Calibration section of this manual for calibration use and instructions.
Also refer to: Multi-point Scaling and Process Variable.
Cascade Control
Applications with long time lags (e.g. indirect heat via hot water jackets) can be difficult to
control with a single control loop. The solution is to split the process into two (or more)
cascaded loops consisting of a Master and Slave acting on a common actuator. The 2-loop
version with built-in cascade feature is ideal for this type of application, although it can be
achieved with two discrete controllers, one with a setpoint retransmission output and the
other with a remote setpoint input.
The master controller measures the main process variable and compares it to the desired
product setpoint. Its PID output becomes the slave’s effective setpoint (scaled to suit the
process).
This is compared the slave’s process input, and the controlling actuator is adjusted
accordingly.
Refer to the Cascade Control section of this manual for full details.
Also refer to: Master & Slave; Proportional Control; PID; Remote Setpoint and Setpoint.
Clock Configuration
A sub-menu of the configuration menu used to adjust the setting of the real time clock fitted
with the data recorder option (e.g. date, time, and date format).
Also refer to: Data Recorder and Configuration Mode
Communications Write Enable
Enables/disables the changing of parameter values via the Serial Communications link, if a
communication option such as Modbus RTU (RS485) or Modbus TCP (Ethernet) is installed.
When disabled, communication becomes read-only.
Also refer to: Ethernet; Modbus RTU; Modbus TCP; RS485 and Serial Communications
Configuration Menu
A selection of sub-menus from which the user can adjust the major instrument settings.
There are sub-menus for the Inputs, Control, Outputs, Alarms, Communications, Recorder,
Clock, Display and Lock Codes. Configuration mode is entered from the main menu. An
unlock code is required to access this mode.
Refer to the Configuration Menu information in the Configuration & Use section.
Also refer to: Alarm Configuration, Lock Codes, Clock Configuration, Control Configuration,
Display Configuration, Input Configuration, Main Menu, Output Configuration, Recorder
Configuration, Serial Communications Configuration
Contactor
- Refer to Relay
Continuous Control
Current or voltage correcting variables using linear outputs (4 to 20mA, 0-20mA, 0 to 5V, 0 to
10V or 2 - 10V DC) for proportional control, PI, PD or PID control modes. On-Off control
cannot be used with linear outputs.
Also refer to: Correcting Variable; Linear Output; On-Off Control; PD; PI; PID; Proportional
Control; and Time Proportional Control.