2
*Setting internal parameters.
Next to the adjustment of the setpoint, some internal settings are possible like differential, sensor-
offset, setpoint range and the function cooling or heating.
By pushing the DOWN key for more than 10 seconds, you enter the 'internal programming menu'. In
the left display the upper and lower segment, are blinking. With the UP and DOWN keys the required
parameter can be selected (see the parameter table).
If the required parameter is selected, the value can be read-out by pushing the SET key. Pushing the
UP or DOWN keys, together with the SET key allows you to change the value of this parameter.
If after 20 seconds no key is pushed, the ALFANET 31 changes to its normal operation mode.
*Adjustment sensor.
The sensor can be adjusted by using the Sensor Offset (parameter 04). Indicates the ALFANET 31
e.g. 2°C too much, the Sensor Offset has to de decreased by 2°C.
*Error messages.
In the display of the ALFANET 31 the following error messages can appear:
Er - Sensor broken. Solution:
- Check if the sensor is connected correctly.
- Check the sensor (1000Ωat 25°C).
- Replace the sensor.
EE - Settings are lost. Solution:
- Reprogram the settings.
* Technical details.
Model : ALFANET 31
Range : -50/+50°C, readout per 1°C
Supply : 230 Vac (or 24Vdc or 12Vdc)
Relay : SPDT 250V/16A(C-NO), 8A(C-NC) (cos phi=1)
Communication: RS485-Network (A,B,GND 2-wire shielded)
Control : by pushbuttons on the front.
Front : Polycarbonate IP65
Sensor : SM 811/2m (1000Ωat 25°C)
Sizes : 35 x 77 x 71,5mm (hwd)
Panel hole : 28 x 70mm (hw)
- Provided with memory protection during power failure.
- Connection with screw terminals on the back side.
- Equipped with self test function and sensor failure detection.
- Special versions are available upon request.
