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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.
Description:
Alfa(net) 51 PI -50/+50°C
Type:
Manual
File:
Do180142 ALFANET 51 PI 6M -
50_+50grC Flash V11 EN.docx
VDH Products BV
Manual
-50/+50°C
ALFA(NET) 71 PI
Pages:
8
By:
BVDB
Signed:
Software
151123
Doc.no:
180142
Doc.Version:
1.1
Date:
26-10-2021
SW.Version
V3.01
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Related Manuals for VDH ALFA 51 PI
Summary of Contents for VDH ALFA 51 PI
- Page 1 A few seconds after releasing the SET key the setpoint disappears and the measured temperature is shown again in the display. Description: Alfa(net) 51 PI -50/+50°C Pages: Doc.no: 180142 Type: Manual BVDB Doc.Version: File: Do180142 ALFANET 51 PI 6M - Signed: Date: 26-10-2021 50_+50grC Flash V11 EN.docx VDH Products BV Software 151123 SW.Version V3.01...
- Page 2 ALFA(NET) 51 PI -50/+ 50°C Doc.no.: 180142 version 1.1 5 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.
- Page 3 Reset Alarm. When a error-messages appears it can be resetted by pushing the SET key. The function of this key depends on parameter P37. 11 Technical data Type ALFA 51 PI -50/+50°C or ALFANET 51 PI -50/+50°C Range -50/+50°C readout per 0,1°C Supply 100…240 Vac 50/60Hz...
- Page 4 ALFA(NET) 51 PI -50/+ 50°C Doc.no.: 180142 version 1.1 12 Setting internal parameters Next to the adjustment of the setpoint, internal settings can be made like differential, sensor offset, setpoint range and the functions of the thermostat. Push the DOWN key for more than 10 seconds, to enter the 'Internal Programming Menu'. In the left display the upper- and lower-segment are blinking.
- Page 5 ALFA(NET) 51 PI -50/+ 50°C Doc.no.: 180142 version 1.1 Para- Description Parameter Range Default meter value Alarm type 0 = None 0 .. 2 1 = Absolute 2 = Relative Minimum alarm setpoint -50 .. +50.0°C -50.0 Maximum alarm setpoint -50 ..
- Page 6 ALFA(NET) 51 PI -50/+ 50°C Doc.no.: 180142 version 1.1 13 Function diagram Pagina 6 van 8...
- Page 7 ALFA(NET) 51 PI -50/+ 50°C Doc.no.: 180142 version 1.1 14 Connections Pagina 7 van 8...
- Page 8 ALFA(NET) 51 PI -50/+ 50°C Doc.no.: 180142 version 1.1 15 Dimensions 16 Address VDH Products B.V. Tel.: +31 (0)50 – 30 28 900 Productieweg 1 Fax.: +31 (0)50 – 30 28 980 9301 ZS Roden Email: info@vdhproducts.nl The Netherlands Internet: www.vdhproducts.nl...
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