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* 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 more than 10 seconds, to enter the 'Internal Programming Menu'. In the left

display the upper and lower segment are blinking. Over the 

UP

 and 

DOWN

 keys the required

parameter can be selected (see table for the parameters).
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 71

 changes to the normal operation mode. 

* Adjustment sensors.

Sensor-1 can be adjusted by using the Sensor Offset parameter 06 and Sensor-2 can be adjusted
by using the Sensor Offset parameter 07. Indicates a Sensor e.g. 2°C to much, the according
Sensor Offset has to be decreased with 2°C.

* Error messages.

In the display of the 

ALFANET 71

 the following error messages can appear:

LO

- Minimum alarm.

Solution E1,E2:

HI

- Maximum alarm.

- Check if the sensor is connected correctly.

E1

- Sensor-1 failure.

- Check sensor  (1000

Ω at 25°C).

E2

- Sensor-2 failure.

- Replace sensor.

EEE

- Settings are lost.

Solution EEE:
- Reprogram the settings.

-L-

- In case of sensor short-circuit the display alternates between error-code 

E..

  and 

-L-

, as indication for a short-circuit sensor.

-H-

- In case of open-circuit sensor the display alternates between error-code 

E..

 

 and 

-H-

, as indication for  a open circuit sensor.

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.

* Technical details.

Type

: ALFANET 71 Thermostat

Range

: -50/+50,0°C, above -10°C display per 0,1°C

Supply

: 12Vac 50/60Hz (-5/+10%)

Display

: 3-digit 7-segment display

Relays

: Ry1= SPST(NO)

250V/8A (cos 

φ=1) of 250V/5A (cos φ=0.4)

  Ry2= SPST(NO)

250V/8A (cos 

φ=1) of 250V/5A (cos φ=0.4)

  Ry3= SPDT(NO/NC)

250V/8A (cos 

φ=1) of 250V/5A (cos φ=0.4)

  Relays have one common (C).

Control

: By push buttons on front.

Front

: Polycarbonate IP65

Sensors

: 2x SM 811/2m (PTC 1000

Ω/25°C).

Communication

: RS485-Network (2-wire shielded cable min. 0,75mm

2

)

Dimensions

: 35 x 77 x 71,5mm (HWD)

Panel cutout

: 28 x 70mm (HW)

Accuracy

: ± 0,5% of the range.

- Provided with memory protection during power failure.
- Connections with screw terminals on the back side.
- Equipped with sensor failure detection.
- Special versions on request available.

Содержание ALFANET 71

Страница 1: ...t 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 c...

Страница 2: ...ctly E1 Sensor 1 failure Check sensor 1000Ω at 25 C E2 Sensor 2 failure Replace sensor EEE Settings are lost Solution EEE Reprogram the settings L In case of sensor short circuit the display alternates between error code E and L as indication for a short circuit sensor H In case of open circuit sensor the display alternates between error code E and H as indication for a open circuit sensor Reset A...

Страница 3: ...delay cooling Switch off delay cooling Parameter 20 21 in Sec or Min Minimum on time cooling Minimum off time cooling 0 99 0 99 0 Seconds 1 Minutes 0 99 Minutes 0 99 Minutes 0 0 0 0 0 25 26 27 Minimum setpoint Maximum setpoint Read out above 10 C per 1 C 50 0 50 0 C 50 0 50 0 C 0 No 1 Yes 50 50 0 30 31 32 33 34 35 36 37 Alarm type to setpoint Minimum alarm setpoint Maximum alarm setpoint Time dela...

Страница 4: ...4 Connections Dimensions Address 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 ...

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