VDH ALFANET 72 Bedienungsanleitung

Description: Alfanet 72 -50/+50°C Pages: 8 Doc. No.: 200550

Type: Manual By: JB Version: 1.1

File: Do200550 ALFANET 72 -50_+50grC

Flash V11 EN.docx

Paragraph: Date: 12-11-2021

VDH Products BV

Software:

200540

User manual ALFANET 72

-50/+50°C

1Operation

The ALFANET 72 is a panel mount double Thermostat. The Thermostat has three relay outputs that

can be set for cooling, heating or alarm function. Thermostat-1 uses temp.sensor-1 with relay-1,

Thermostat-2 uses temp.sensor-2 with relay-2. Relay-3 can function as an alarm relay or as 2nd

stage for Thermostat-2. Normally the temperature of temp.sensor-1 is shown on the display.

The ALFANET 72 is provided with an RS-485 network connection, so that it can be read out and

adjusted on the ALFANET thru the ALFANET PC-Interface.

2Installation

On the connection diagram of the ALFANET 72 is shown how the sensors, power supply, relays, and

network should be connected. After connecting the ALFANET 72 to the power supply, a self-test

program is started. As the test is finished the measured temperature of temp. sensor-1 appears in

the display.

3Control

The ALFANET 72 thermostat can be controlled by four pushbuttons on the front.

These keys are;

SET - view / change the set value and reset alarm.

∏ UP - increase the set value.

π DOWN - decrease the set value.

°C - hidden relay status key.

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4View set points

View set point thermostat-1:

By pushing the SET key and then simultaneously pushing the UP key, the setpoint of

thermostat-1 appears in the display.

View set point thermostat-2:

By pushing the SET key and then simultaneously pushing the DOWN key, the setpoint of

thermostat-2 appears in the display.

A few seconds after releasing the keys the set point disappears and the measured temperature of

thermostat-1 is shown again in the display.

5Changing set points

Push the SET key together with the UP or DOWN key in order to select the desired set point (see

above). Release the SET key.

Now push the SET key again together with the UP or DOWN keys to change the set point.

A few seconds after releasing the keys, the measured temperature of sensor-1 is shown again in the

display.

6View individual temperatures.

By pressing the UP key, the measured temperature of sensor-2 is shown in the display. After

releasing the UP key, the measured temperature of sensor-1 is shown again in the display.

7Status van de relais

By pushing the hidden oC 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.

8Adjustment temp. sensors

Sensor-1 can be adjusted by using the Sensor Offset parameter 05 and Sensor-2 can be adjusted

by using the Sensor Offset parameter 06. Indicates a Sensor e.g. 2oC too much, the according Sensor

Offset has to be decreased with 2oC.

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9Error messages

In the display of the ALFANET 72 the following error messages can apppear:

E1 - Sensor-1 failure. Solutiuon E1, E2:

E2 - Sensor-2 failure. - Check if sensor is connected correctly.

Lo1 - Minimum alarm thermostat-1. - Check sensor value (1000Ω/25°C).

Hi1 - Maximum alarm thermostat-1. - Replace sensor.

Lo2 - Minimum alarm thermostat-2.

Hi2 - Maximum alarm thermostat-2.

Reset Alarm. When an error-messages appears it can be resetted by pushing the SET

key. The function of this key depends on parameter P42.

10 Technical details

Type ALFANET 72 -50/+50°C

Range -50/+50°C readout per 0,1°C

Supply 12 Vdc/ac 50/60Hz, 3VA (-5…+10%)

Display 3-digit 7-segments LED display

Sensors 2x SM 811 2-Wire PTC 1000Ω/25°C

Relays Ry1 = SPST (NO) 250V/8A cosphi=1 or 250V/5A cosphi=0.4

Ry2 = SPST (NO) 250V/8A cosphi=1 or 250V/5A cosphi=0.4

Ry3 = SPDT (NO/NC) 250V/8A cosphi=1 or 250V/5A cosphi=0.4

Relays have one common (C)

Communication RS-485 Network Twisted-pair shielded

only at ALFANET A, B, 0V (A and B twisted)

Control By four push buttons on front

Front Polycarbonate

Dimensions 35 x 77 x 71,5 mm (H x B x D)

Panel cutout 28 x 70 mm (H x B) for front mounting

- Provided with memory protection during power failure.

- Connections with screw terminals on the back side.

- Equipped with sensor failure detection.

- Special versions are on request available.

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11 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. With the UP and DOWN keys the required

parameter can be selected (see the parameter table).

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 ALFANET 72 changes to the normal operation mode.

11.1 Parameters ALFANET 72

Para-

meter

Description Range Default

value

01 Function relay 1 1 = Cooling

2 = Heating

1..2 1

02 Function relay 2 1 = Cooling

2 = Heating

1..2 1

03 Function relay 3 1 = Cooling

2 = Heating

3 = Alarm

1..3 3

05 Offset temperature sensor-1 -15 .. +15.0°C 0.0

06 Offset temperature sensor-2 -15 .. +15.0°C 0.0

10 Switching differential relay 1 0.1 .. 15.0°C 0.5

11 Setpoint offset relay 1 -15 .. +15.0°C 0.0

12 Switching differential relay 2 0.1 .. 15.0°C 0.5

13 Setpoint offset relay 2 -15 .. +15.0°C 0.0

14 Switching differential relay 3 0.1 .. 15.0°C 0.5

15 Setpoint offset relay 3 -15 .. +15.0°C 0.0

20 Switch-on delay cooling 0 .. 99 0

21 Switch-off delay cooling 0 .. 99 0

22 Parameter 20/21 in seconds or minutes 0 = Sec., 1=Min. 0

23 Minimum on-time cooling 0 .. 99 Minutes 0

24 Minimum off-time cooling 0 .. 99 Minutes 0

25 Minimum adjustable set point -50 .. +50.0°C -50

26 Maximum adjustable set point -50 .. +50.0°C +50.0

27 Readout above -10°C on whole degrees 0 = No, 1 =Yes 0

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30 Alarm type thermostaat-1 0 = None

1 = Absolute

2 = Relative

0 .. 2 1

31 Minimum alarm set point-1 -50 .. +50.0°C -50

32 Maximum alarm set point-1 -50 .. +50.0°C +50.0

33 Time delay minimum alarm-1 0 .. 99 Minutes 0

34 Time delay maximum alarm-1 0 .. 99 Minutes 0

35 Alarm type thermostaat-2 0 = None

1 = Absolute

2 = Relative

0 .. 2 1

36 Minimum alarm set point-2 -50 .. +50.0°C -50

37 Maximum alarm set point-2 -50 .. +50.0°C +50.0

38 Time delay minimum alarm-2 0 .. 99 Minutes 0

39 Time delay maximum alarm-2 0 .. 99 Minutes 0

40 Function alarm relay 0 = Watch alarm

1 = Control alarm

0 .. 1 0

41 Reset alarm relay after power failure 0 = No, 1 =Yes 0

42 Reset alarm relay after manual reset 0 = No, 1 =Yes 0

45 Regelvertraging na spanningsuitval 0 .. 99 Minutes 0

46 Geforceerde relais-1 functie bij voeler-1 storing

0 = Geen

1 = Aan

0 .. 1 0

47 Geforceerde Relais-2(,3) functie bij voeler-2 storing

0 = Geen

2 = Relais-2 aan

3 = Relais-3 aan

0 .. 3 0

52 Tijdcorrectie (bij realtime clock) -99 .. 99 min./year 0

90 Network number (Only at ALFANET) 1..250 1

95 Software version - -

96 Production year - -

97 Production week - -

98 Serial number (x1000) - -

99 Serial number (units) - -

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12 Function diagram

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13 Connections

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14 Dimensions

15 Adress

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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