2
* Status of the Relays.
By pushing the
MODE
key the display shows the status of the relays. Each display segment shows
the status of the relay output, showing 0=off and 1=on. The code 110 means relay 1 and 2 are on
and relay 3 is off.
* Setting internal parameters.
Next to the adjustment of the set point, internal settings can be made like differential, sensor offset,
set point range and the functions of the thermostat.
Push the
DOWN
key more than 10 seconds, to enter the 'Internal Programming Menu'. In the left
display the upper and lower segment are blinking. 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
or
DOWN
key to change the value of this parameter.
If after 20 seconds no key is pushed, the
ALFA(NET) 52
changes to the normal operation mode.
* Adjustment sensors.
Sensor-1 can be adjusted by using the Sensor Offset parameter 05 and Sensor-2 can be adjusted
by using the Sensor Offset parameter 06. Indicates a Sensor e.g. 2
C to much, the according
Sensor Offset has to be decreased with 2
C.
* Error messages.
In the display of the
ALFA(NET) 52
the following error messages can appear:
Lo1
- Minimum alarm thermostat-1.
Solution E1,E2:
Hi1
- Maximum alarm thermostat-1.
- Check if the sensor is connected correctly.
Lo2
- Minimum alarm thermostat-2.
- Check sensor (1000
at 25
C).
Hi2
- Maximum alarm thermostat-2.
- Replace sensor.
E1
- Sensor-1 failure.
E2
- Sensor-2 failure.
Solution EEE:
EEE
- Settings are lost.
- 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 an error-messages appears it can be reset by pushing the
SET
key. The
function of this key depends on parameter P42.
* Technical data ALFA(NET) 52.
Type
: ALFA(NET) 52 Double thermostat (Rail-mounting)
Range
: 0/+100
C per 0,1
C
Supply
: 230Vac 50/60Hz (-5/+10%)
Readout
: 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)
Ry3= SPDT(NO/NC)
250V/8A (cos
=1) or 250V/5A (cos
=0.4)
Relays have one common (C).
Control
: By push buttons on front.
Front
: Polycarbonate
Sensors
: 2x SM 811/2m (PTC 1000
/25
C).
Communication
: RS 485 Network (2xtwisted pair shielded) only at ALFANET model.
Dimensions
: 90 x 71 x 58mm (HWD)
Panel cutout
: 46 x 71mm (HW) at front mounting
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.
