West Control Solutions Pro-EC44 - Manual (Page 24)

Pro-EC44 2-Loop Graphical Profile Controller & Recorder
Pro-EC44 Product Manual - 59540-1 October 2013 Page 17
Universal Input 1 Connections - Linear Volt, mV or mA input
The input supports the following linear/analogue signals: 0 to 50mV; 10 to 50mV; 0 to 5V; 1
to 5V; 0 to 10V; 2 to 10V; 0 to 20mV; 4 to 20mA from any suitable source. Voltage & millivolt
signals are connected to terminals 2 & 3, milliamp signals are connected to 1 & 3. Carefully
observe the position & polarity of the connections.
Figure 13. Input 1 - DC Volt, mV & mA Connections
Universal / Auxiliary Input 2 Connections
An Auxiliary Input 2 option is fitted to some models. This can connect to a potentiometer;
analogue mA; mV or V DC signal for a remote setpoint input signal, or for flow/valve position
feedback information.
Alternatively, a second Universal Input 2 option may be fitted. In addition to the remote
setpoint input signal or feedback information possible with the auxiliary input, the 2
nd
Universal Input can be used as a second process control loop for two control loops, or used
in conjunction with input one in more complex single control loops. Universal Input 2 can be
connected to thermocouples; resistance temperature detectors; potentiometers; analogue
mA; mV or V DC signals.
The settings are in the Input 2 Configuration sub-menu. Connections for the various types
are shown below. Ensure that the signal is correctly connected, paying particular attention to
the polarity.
Universal Input 2 Connections - Thermocouple (T/C)
The optional 2
nd
universal input, supports various thermocouple types. Supported types &
ranges are listed in the input specifications section on page 245.
Only use the correct thermocouple wire or compensating cable from the sensor to the
instrument terminals avoiding joints in the cable if possible. Where joints are made, special
thermocouple connectors must be used. Failure to use the correct wire type and connectors
will lead to inaccurate readings. Ensure correct polarity of the wires by cross-referencing the
colours with a thermocouple reference table.
Figure 14. Input 2 - Thermocouple Connections