Description:
Alfa(net) 51 PI -50/+50°C
Pages:
8
Doc.no:
180142
Type:
Manual
By:
BVDB
Doc.Version:
1.1
File:
Do180142 ALFANET 51 PI 6M -
50_+50grC Flash V11 EN.docx
Signed:
Date:
26-10-2021
VDH Products BV
Software
151123
SW.Version
V3.01
Manual
ALFA(NET) 71 PI
-50/+50°C
1
Function
The ALFA(NET) 51 PI is a DIN-rail mounting thermostat-
unit, with an analog 0-10Vdc PI-output, selectable for
function: Cool and/or Heat.
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 range of the
thermostat is -50/+50°C
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.
4
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.
