1
User manual
ALFA 51 PI -10/+90
C
Rail-Thermostat.
VDH doc. 070033
Version: v1.0
Date: 27-09-2007
Software: ALFA51-PI (–10+90)
File: Do070033.WPD
Range: -10/+90,0
C
* Installation.
On the connection diagram of the
ALFA 51 PI
is shown how the sensors, analogue output, power supply
and relays are to be connected. After connecting the
ALFA 51 PI
to the power supply, a self test function
is started. As this test is finished, the measured temperature appears in the display.
* Control.
The
ALFA 51 PI
thermostat can be controlled by four pushbuttons on the front. These keys are:
SET
- view / change the setpoint.
UP
- increase the setpoint.
DOWN
- decrease the setpoint.
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.
