ALFA(NET) 51 PI 24Vdc -50/+50°C
Doc.no.: 150301 version 1.1
Pagina 3 van 8
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Error messages
In the display of the ALFA(NET) 51 PI 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
Ω
/25°C).
- Replace sensor.
-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.
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Technical data
Type
ALFA 51 PI 24Vdc of
ALFANET 51 PI 24Vdc
Range
-50/+50°C
readout per 0,1°C
Supply
24 Vdc
(14…30 Vdc)
Display
3-digit 7-segment
LED display
Sensor
SM 811 2-Wire
PTC 1000
Ω
/25°C
Relays
Ry1 = SPST (NO)
250V/8A cosphi=1 or 250V/5A cosphi=0.4
Ry2 = SPST (NO)
250V/8A cosphi=1 or 250V/5A cosphi=0.4
Ry3 = SPDT (NO/NC)
250V/8A cosphi=1 or 250V/5A cosphi=0.4
Relays have one common (C)
Analogue output
0-10Vdc PI-output
Rload = min. 10KOhm
Communication
RS-485 Network
Twisted-pair shielded
only at ALFANET
A, B, 0V (Twist A and B)
Control
By four push buttons on the front
Front
Polycarbonate
Dimensions
90 x 71 x 58 mm
(H x W x D)
Panel cut out
46 x 71 mm
(H x W) for front mounting
Accuracy
+/- 0,5% of the range
- Provided with memory protection during power failure.
- Connection with screw terminals.
- Equipped with senor failure detection.
- Special versions are on request available.
