VDH ALFANET51 RTDN User Manual

User manual
ALFA(NET) 51 RTDN
Rail-Thermostat with real time clock.
VDH doc. 072243
Software: ALFANET51 RTDN

* Installation.

On the connection diagram of the ALFA(NET) 51 RTDN is shown how the sensors, power supply and
relays should be connected. After connecting the ALFA(NET) 51 RTDN 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 this case the
average temperature of both sensors is displayed and used for control. The ALFANET 51 RTDN is by
use of the ALFANET PC-INTERFACE controllable on the PC.

* Control.

The ALFA(NET) 51 RTDN thermostat can be controlled by four pushbuttons on the front. These keys are:
SET - view / change the set point.
UP - increase the set point.
DOWN - decrease the set point.
MODE - relay status key.

* Viewing set point.

By pushing the SET key the set point appears in the display. The decimal point of the last display starts
blinking. A few seconds after releasing the SET key the set point disappears and the measured
temperature is shown again in the display.

* Changing set point.

Push the SET key and the set point appears in the display. Release the SET key. Now push the SET key
again together with the UP or DOWN keys to change the set point. 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.
Version: v1.0
File: Do072243.WPD
1
Date: 16-10-2007
Range: -50/+50,0C