VDH ALFA(NET) 71 PI Manual

VDH ALFA(NET) 71 PI Manual

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1 Function

The ALFA(NET) 71 PI is a panel mount 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 71 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) 71 PI is shown how the sensors, analogue output,
power supply, relays and optional network are to be connected. After connecting the ALFA(NET) 71
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) 71 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.
°C
- hidden relay status key.
Description:
Alfa(net) 71 PI -10/+90°C
Type:
Manual
File:
Do151043 ALFANET 71 PI -10_+90°C
Flash V11 EN.docx
VDH Products BV
Manual
-10/+90°C
Pages:
By:
Signed:
Software
ALFA(NET) 71 PI
8
Doc.no:
BVDB
Doc.Version:
Date:
151121
SW.Version
151043
1.1
22-01-2016
V3.00

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Summary of Contents for VDH ALFA(NET) 71 PI

  • Page 1 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) 71 PI thermostat can be controlled by four pushbutton on the front. These keys are; - view / change set value and reset alarm. ∏ UP - increase set value.
  • Page 2 ALFA(NET) 71 PI -10/+ 90°C Doc.no.: 151043 version 1.1 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.
  • Page 3 ALFA(NET) 71 PI -10/+ 90°C Doc.no.: 151043 version 1.1 9 Error messages In the display of the ALFA(NET) 71 PI the following error messages can appear: - Minimum alarm. Solution E1: - Maximum alarm. - Check if the sensor is connected correctly.
  • Page 4 If the required parameter is selected, the value can be read-out by pushing the SET key. Pushing the UP or DOWN key to change the value of this parameter. If after 20 seconds no key is pushed, the ALFA(NET) 71 PI changes to the normal operation mode. 11.1 Parameters ALFA(NET) 71 PI...
  • Page 5 ALFA(NET) 71 PI -10/+ 90°C Doc.no.: 151043 version 1.1 Para- Description Parameter Range Default meter value Minimum adjustable setpoint -10.0 .. +90.0°C -10.0 Maximum adjustable setpoint -10.0 .. +90.0°C +90.0 Readout in whole degrees 0 = No, 1 =Yes Alarm type 0 = None 0 ..
  • Page 6 ALFA(NET) 71 PI -10/+ 90°C Doc.no.: 151043 version 1.1 12 Function diagram Pagina 6 van 8...
  • Page 7 ALFA(NET) 71 PI -10/+ 90°C Doc.no.: 151043 version 1.1 13 Connections Pagina 7 van 8...
  • Page 8 ALFA(NET) 71 PI -10/+ 90°C Doc.no.: 151043 version 1.1 14 Dimensions 15 Address Tel.: +31 (0)50 – 30 28 900 VDH Products B.V. 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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Alfanet 71 pi

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