2
* Adjustment sensors.
The temperature sensor can be adjusted by using the Sensor Offset parameter 06.
Indicates the Sensor e.g. 2
C to much, the Sensor Offset has to be decreased with 2
C.
* Error messages.
In the display of the
ALFA 71 PI SSR 24Vdc
the following error messages can appear:
LO
- Minimum alarm.
Solution E1:
HI
- Maximum alarm.
- Check if the sensor is connected correctly.
E1
- Sensor-1 failure.
- Check sensor (1000
at 25
C).
- Replace sensor.
EEE
- Settings are lost.
Solution EEE:
- Reprogram the settings.
-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 resetted by pushing the
SET
key.
The function of this key depends on parameter P37.
* Technical details.
Type
: ALFA 71 PI SSR 24Vdc Thermostat with Solid State output
Range
: -50/+50,0
C, above -10
C display per 0,1
C
Supply
: 24Vdc (16...35Vdc Abs. Max.)
Display
: 3-digit 7-segment display
Relays
: Ry1= SPST(NO) 250V/8A (cos
=1) or 250V/5A (cos
=0.4)
Ry2= SPST(NO) 250V/8A (cos
=1) or 250V/5A (cos
=0.4)
Control
: By push buttons on front.
Front
: Polycarbonate IP65
Sensor
: SM 811/2m (PTC 1000
/25
C).
Solid State output
: Open collector Solid State output (Max. 250mA, 24Vdc)
Dimensions
: 35 x 77 x 71,5mm (HWD)
Panel cutout
: 28 x 70mm (HW)
Accuracy
: ± 0,5% of the range.
- Provided with memory protection during power failure.
- Connections with screw terminals on the back side.
- Equipped with sensor failure detection.
- Special versions on request available.
* Function diagrams.
