The RWF50… is used primarily for the control of temperature or pressure in oil- or gasfired heating plants. Depending on the model, it is employed as a compact 3-position controller without feedback of angular positioning or as a modulating controller with an analog output. An external switch is provided to convert it to a 2-position controller for controlling 2-stage burners. The built-in thermostat function switches the burner on and off.
- The controllers feature two 4-digit 7-segment displays for the actual value (red) and the setpoint (green).
- The RWF50.2 has a 3-position output consisting of 2 relays to open or close a controlling element.
- The RWF50.3 has an analog output.
In modulating mode, the RWF50… operates as a PID controller. In 2-stage mode, the RWF50… provides control based on the set switching threshold. Using the binary input, a change to a second setpoint can be made or the setpoint can be shifted. Standard feature is a self-setting function used to determine the PID control parameters.
The controller insert measures 48 x 48 x 104 mm and is especially suited for installation in control panels. All electrical connections are made via screw terminals at the rear of the unit.