2
* Sensor adjustment.
The humidity-sensor can be adjusted by using the Offset Humidity sensor (parameter 05).
Indicates the
ALFANET 79
e.g. 2% too much, than the Offset Humidity sensor (parameter 05) has
to be decreased with 2%.
* Error messages.
In the display of the
ALFANET 79
the following error messages can appear:
rLO
- Minimum RH alarm.
Solution E1:
rHI
- Maximum RH alarm.
- Check if sensor is connected correctly.
E1
- RH sensor failure.*
- Check RH-signal. (0/+100%RH=0/+1Vdc)
- Replace sensor.
EE
- Settings are lost.
Solution EE:
- 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 reset by pushing the
SET
key. The function of this key
depends on parameter P37.
* Technical details.
Type
: ALFANET 79 Hygrostat.
Range
: 0/+100%RH read-out per 1%RH
Read out
: 3-digit 7-segments display
Status LEDs
: LED 'SET' and LED 'RH'
Supply
: 12 Vac 50/60Hz (-5/+10%).
Relays
: Ry1= SPST(NO) 250V/8A (cos
φ=1) of 250V/5A (cos φ=0.4)
Ry2= SPST(NO) 250V/8A (cos
φ=1) of 250V/5A (cos φ=0.4)
Ry3= SPDT(NO/NC) 250V/8A (cos
φ=1) of 250V/5A (cos φ=0.4)
The three relays have one common (C).
Control
: Thru pushbuttons on front.
Front
: Polycarbonate.
Sensor
: RH 95-2 (+12Vdc; 0/+100%RH = 0/+1Vdc)
Communication
: RS485-Network (2-wire shielded min. 0,75mm
2
; A, B and GND)
Dimensions
: 35 x 77 x 71,5mm (HWD).
Panel-cutout
: 29 x 71mm (HW).
Accuracy
: ± 0,5% of 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.