2
* Setting internal parameters.
Next to the adjustment of the set point, some internal settings can be made like differentials,
sensor-adjustments, set point-range and alarm-settings.
By pushing the
DOWN
key for more than 10 seconds, you enter the 'internal programming menu'.
On the left display the upper and the lower segments are flashing. Over the
UP
and
DOWN
keys
the required parameter can be selected (see table for the parameters). If the required parameter is
selected, the value can be read-out by pushing the
SET
key. Pushing the
UP
and
DOWN
keys
allows you to change the value of this parameter.
If no key is pushed for 20 seconds, the
ALFANET 71-2SP
changes to it’s normal operation mode.
* Adjusting the sensors.
The sensors can be adjusted with the sensor offset (parameter 06(sensor-1) and parameter
07(sensor-2)). Indicates a sensor e.g. 2
C too much, the according Sensor-offset parameter has to
be decreased with 2
C.
* Error codes.
On the display from the
ALFANET 71-2SP
can appear the following error messages:
LO
- Minimum alarm.
Solution E1,E2:
HI
- Maximum alarm.
Check if the sensor is connected well.
E1
- Sensor-1 defect.
- Check the sensor (1000
/25
C).
E2
- Sensor-2 defect.
- Replace the sensor.
EEE
- Adjustments are lost.
Solution EEE:
- Reprogram the adjustments.
-L-
- In case of sensor short-circuit the display alternates between error-code
E..
and
-L-
, as indication for a short-circuit sensor.
-H-
- In case of open-circuit sensor the display alternates between error-code
E..
and
-H-
, as indication for a open circuit sensor.
Reset Alarm.
When a error-messages appears it can be reset by pushing the
SET
key.
The function of this key depends on parameter P37.
* Technical details.
Type
: ALFANET 71-2SP Thermostat
Range
: -50/+50,0
C, above -10
C read out per 0,1
C
Supply
: 12Vac 50/60Hz (-5/+10%)
Read out
: 3-digit 7-segments display
Relays
: Ry1= SPST(NO)
250V/8A (cos
=1) of 250V/5A (cos
=0.4)
Ry2= SPST(NO)
250V/8A (cos
=1) of 250V/5A (cos
=0.4)
Ry3= SPDT(NO/NC)
250V/8A (cos
=1) of 250V/5A (cos
=0.4)
Relays have one common (C).
Control
: through push buttons on the front.
Front
: Polycarbonate IP65
Sensors
: 2x SM 811/2m (PTC 1000
/25
C).
Dimensions
: 35 x 77 x 71,5mm (hwd)
Panel cut out
: 28 x 70mm (hw)
Accuracy
: ± 0,5% from the range.
- Provided with memory protection during power failure.
- Equipped with self-test function and sensor-failure detection.
- Connection with screw-terminals.
- Special version on request available.
