2
*Changing setpoints.
Push the SET key together with the UP or DOWN key and the maximum alarm setpoint or
minimum alarm setpoint appears in the display. Release both keys.
Now push and hold the SET key again and together with the UP or DOWN keys the setpoint can
be changed. A few seconds after releasing the keys the measured temperature is shown again in
the display.
*Action of the alarm functions.
The ALFA(NET) 13 DP alarm thermostat has a minimum alarm and a maximum alarm, both with
there own setpoint. We can choose off two different kind of alarms (Parameter 27) namely:
a watchdog alarm (relay normally activated, at alarm, it falls off and the led 'set high' burns. On
power failure the alarm relay also falls off.)
or a regulated alarm (relay normally not activated, at alarm, it will be activated and the led 'set high'
burns.
With Parameter 28 we can choose for a auto reset alarm or a hold alarm after temperature
recovering. Also it is possible to give both setpoints there own offset and differential, see function
diagram.
Each alarm can be set at an alarm-delay time (Parameter 23 and 24), when the temperature
passes the set alarm point, the led 'set high' first starts to blink. If the temperature will recover within
the delay time, no alarm occurs.
If an alarm will continue after the delay time, the led 'set high' burns continuously, and the display
alternates between the temperature and 'H' for high-alarm (max.) or 'L' for low-alarm (min.) to
indicate the alarm.
To reset an alarm press the SET key.
*Adjustment sensor.
The sensor can be adjusted by using the Sensor Offset (parameter 04). Indicates the ALFA(NET)
13 DP e.g. 2C to much, the Sensor Offset has to de decreased with 2C.
*Error messages.
In the display of the ALFA(NET) 13 DP the following error messages can appear:
Er - Sensor broken. Solution:
- Check if the sensor is connected correctly.
- Check the sensor (1000at 25C).
- Replace the sensor.
EE - Settings are lost. Solution:
- Reprogram the settings.
* Technical details.
Model :ALFA 13 DP Alarm Thermostat
ALFANET 13 DP Alarm Thermostat with Network
Range :-10/+40C, readout per 0,1C
Supply :230 Vac / 1,2VA 50/60Hz (or else see product sticker)
Relay :SPDT 250V/16A(C-NO), 8A(C-NC) (cos phi=1)
Communication :RS 485 Network (2xtwisted pair shielded) only at ALFANET model.
Control :by pushbuttons on the front.
Front :Polycarbonate IP65
Sensor :SM 811/2m (1000at 25C)
Sizes :90 x 53 x 58mm (hwd)
Panel hole :46 x 53mm (hw)
- Provided with memory protection during power failure.
- Connection with screw terminals on the backside.
- Equipped with self test function and sensor failure detection.
- Special version on request available.
