VDH ALFA(NET) 51 PI Manual

1 Function
The ALFA(NET) 51 PI is a DIN-rail thermostat-unit with an
analog 0-10Vdc PI-output. The thermostat has also three
relays outputs selectable for function cooling, heating or
alarm. The temperature is being measured by an SM811 2-
Wire temperature sensor.
The ALFANET 51 PI is provided with an RS-485 network connection and can be readout or set by an
PC with the ALFANET program connected thru an ALFANET PC-Interface.
2 Installation
On the connection diagram of the ALFA(NET) 51 PI is shown how the sensors, analogue output,
power supply, relays and optional network are to be connected. After connecting the ALFA(NET) 51
PI to the power supply, a self-test function is started. As this test is finished, the measured
temperature appears in the display.
3 Control
The ALFA(NET) 51 PI thermostat can be controlled by four pushbutton on the front. These keys are;
SET - view / change set value and reset alarm.
∏ UP - increase set value.
π DOWN - decrease set value.
MODE - relay status key.
Description: Alfa(net) 51 PI 24Vdc -50/+50°C
Type: Manual
File: Do150301 ALFANET 51 PI -50_+50grC
V11 EN.docx
VDH Products BV
Manual
24Vdc -50/+50°C
Pages:
By:
Signed:
ALFA(NET) 51 PI
8 Doc.no:
BVDB Version:
Date:
150301
1.1
04-06-2015