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 no key is pushed for 20 seconds, the
ALFA(NET) 31
changes to its normal operation mode.
* Adjustment sensor.
The sensor can be adjusted by using the Sensor Offset (parameter 04). Indicates the
ALFA(NET) 31
e.g. 2
C too much, the Sensor Offset has to de decreased by 2
C.
* Error messages.
In the display of the
ALFA(NET) 31
the following error messages can appear:
Er
- Sensor broken. Solution:
- Check if the sensor is connected correctly.
- Check the sensor (1000
at 25
C).
- Replace the sensor.
EE
- Settings are lost. Solution:
- Reprogram the settings.
* Technical details.
Model
: ALFA(NET) 31
Range
: 0/+100
C, readout per 1
C
Supply
: 230 Vac (or else see product sticker)
Relay
: SPDT 250V/16A(C-NO), 8A(C-NC) (cos phi=1)
Communication: RS485-Network (A,B,GND 3-wire shielded) only at ALFANET 31
Control
: by pushbuttons on the front.
Front
: Polycarbonate IP65
Sensor
: SM 811/2m (1000
at 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.
