User manual
ALFA 51 and
ALFANET 51
-50/+150°C (0,1)
Rail-Thermostat
VDH doc. 120818
Version: v1.0
Date: 09-01-2015
Software: ALFA(N) 51/61/71 F
File: Do120816.wpd
Range: -50/+150,0°C
* Installation.
On the connection diagram of the
ALFA(NET) 51
is shown how the sensors, power supply and relays
are to be connected. After connecting the
ALFA(NET) 51
to the power supply, a self test function is
started. As this test is finished, the measured temperature appears in the display. Normally this is the
temperature of sensor-1, unless sensor-2 is active as control sensor (P05=1) in that case the average
temperature of both sensors is displayed and used for control. The
ALFANET 51
is by use of the
ALFANET PC-INTERFACE
controllable on the PC.
* Control.
The
ALFA(NET) 51
thermostat can be controlled by four pushbuttons on the front. These keys are:
SET
- view / change of set value and confirm alarms
>
(UP)
- increase set value.
?
(DOWN)
- decrease set value.
MODE
- relay status key.
* Viewing setpoint.
By pushing the
SET
key the setpoint appears in the display. The decimal point of the last display starts
blinking. A few seconds after releasing the
SET
key the setpoint disappears and the measured
temperature is shown again in the display.
* Changing setpoint.
Push the
SET
key and the setpoint appears in the display. Release the
SET
key. Now push the
SET
key again together with the
UP
or
DOWN
keys to change the setpoint. A few seconds after releasing
the keys the measured temperature shows again in the display.
* Viewing the individual sensors.
By pressing the
UP
and
DOWN
key together, the individual sensors can be shown in the display. After
releasing the keys, the measured temperature of sensor-1 can be shown by pushing the
UP
key or the
measured temperature of sensor-2 can be shown by pushing the
DOWN
key. A few seconds after
releasing the keys the (average) temperature shows again in the display.
* 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.
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