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User manual
ALFA 51 and
ALFANET 51
-50/+150°C (0,1)

Rail-Thermostat

VDH doc. 120818

Version: v1.0

Date: 09-01-2015

Software: ALFA(N) 51/61/71 F

File: Do120816.wpd

Range: -50/+150,0°C

* Installation.

On the connection diagram of the 

ALFA(NET) 51

 is shown how the sensors, power supply and relays

are to be connected. After connecting the 

ALFA(NET) 51

 to the power supply, a self test function is

started. As this test is finished, the measured temperature appears in the display. Normally this is the
temperature of sensor-1, unless sensor-2 is active as control sensor (P05=1) in that case the average
temperature of both sensors is displayed and used for control. The 

ALFANET 51

 is by use of the

ALFANET PC-INTERFACE

 controllable on the PC.

* Control.

The 

ALFA(NET) 51

 thermostat can be controlled by four pushbuttons on the front. These keys are:

SET

- view / change of set value and confirm alarms

>

 (UP)

- increase set value.

?

 (DOWN)

- decrease set value.

MODE

- relay status key.

* 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.

* 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.

* Viewing the individual sensors.

By pressing the 

UP

 and  

DOWN

 key together, the individual sensors can be shown in the display. After

releasing the keys, the measured temperature of sensor-1 can be shown by pushing the 

UP

 key or the

measured temperature of sensor-2 can be shown by pushing the 

DOWN

 key. A few seconds after

releasing the keys the (average) temperature shows again in the display.

* Status of the Relays.

By pushing the 

MODE

 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.

1

Содержание ALFA 51

Страница 1: ...ng 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 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...

Страница 2: ...digit 7 segments display Relays Ry1 SPST NO 250V 8A cos φ 1 or 250V 5A cos φ 0 4 Ry2 SPST NO 250V 8A cos φ 1 or 250V 5A cos φ 0 4 Ry3 SPDT NO NC 250V 8A cos φ 1 or 250V 5A cos φ 0 4 Relays have one common C Control By pushbuttons on front Front Polycarbonate IP65 Sensors 2x SM 811 2m PTC 1KOhm 25 C Communication RS485 Network 2xTwisted pair shielded min 0 5mm2 A B Gnd 0V Dimensions 90 x 71 x 58mm ...

Страница 3: ...ay cooling Parameter 20 21 in 0 Seconds 1 Minutes Minimum on time cooling Minimum off time cooling 0 99 0 99 0 1 0 99 Minutes 0 99 Minutes 0 0 0 0 0 25 26 27 Minimum setting setpoint Maximum setting setpoint Readout above 10 C on whole degrees 50 0 150 0 C 50 0 150 0 C 0 No 1 Yes 50 150 0 30 31 32 33 34 35 36 37 Alarm type 0 None 1 Absolute 2 Relative to setpoint Minimum alarm setpoint Maximum ala...

Страница 4: ... Dimensions Connections Adress VDH Products BV Tel 31 0 50 30 28 900 Produktieweg 1 Fax 31 0 50 30 28 980 9301 ZS Roden Email info vdhproducts nl The Netherlands Internet www vdhproducts nl 4 ...

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