VDH ALFA 71 MOD Bedienungsanleitung

User manual

ALFA 71 MODulation

Thermostat.

VDH doc. 052939 Version: v1.0 Date: 03-10-2005

Software: ALFA71MOD File: DO052939.WPD Range: -50/+50,0C

*Installation.

On the top side of the ALFA 71 MOD is shown how the sensors, power supply, relays and 0..10Vdc

PI output has to be connected.

After connecting the ALFA 71 MOD to the power supply, a self test function is started. As this test is

finished the measured temperature appears in the display.

*Control.

The ALFA 71 MOD thermostat can be controlled by four pushbuttons on the front. These keys are:

SET - view / change the setpoint.

UP - increase the setpoint.

DOWN - decrease the setpoint.

C- hidden push button above the SET key and behind Csymbol.

*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

keyagain 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.

*Status of the Relays.

By pushing the hidden Ckey 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.

*Readout valve position.

By pushing the UP key the display shows the current valve position.

*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 ALFA 71 MOD changes to the normal operation mode.

*Adjustment sensors.

The temperature sensor can be adjusted by using the Sensor Offset parameter 05.

Indicates the Sensor e.g. 2C to much, the Sensor Offset has to be decreased with 2C.

*Error messages.

In the display of the ALFA 71 MOD the following error messages can appear:

LO - Minimum alarm. Solution E1:

HI - Maximum alarm. - Check if the sensor is connected correctly.

E1 - Sensor-1 failure. - Check sensor (1000at 25C).

- 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 theSET key.

The function of this key depends on parameter P37.

* Technical details.

Type : ALFA 71 MOD 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= Open SPST(NO)250V/8A (cos =1) of 250V/5A (cos =0.4)

Ry2= Close SPST(NO)250V/8A (cos =1) of 250V/5A (cos =0.4)

Ry3= Alarm SPDT(NO/NC)250V/8A (cos =1) of 250V/5A (cos =0.4)

Relays have one common (C).

Control : By push buttons on front.

Front : Polycarbonate IP65

Sensor : SM 811/2m (PTC 1000/25C).

Analog output : 0..10 Vdc PI output (cool or heat)

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.

*Parameters ALFA 71 MOD

Para-

meter Description Parameter Range Default

01 Function thermostat 1=Cool

2=Heat 1

02 Offset temperature sensor-1 -15.0..+15.0C 0.0

P-band

I-time

Runtime valve

Reset time

Reset to minimum or maximum valve

position

0,0..+15,0C

0..99 Minutes

0..999 Seconds

0..999 Minutes

0 = mimimum

1 = maximum

5,0

120

Minimum setpoint

Maximum setpoint

Read-out above -10C per 1C

-50,0..+50,0

0= no, 1= yes

-50,0

+50,0

Alarm type

Minimum alarm setpoint

Maximum alarm setpoint

Time delay minimum alarm

Time delay maximum alarm

Relay function alarm relay

Reset alarm relay after recovering

alarm

Reset alarm relay after manual reset

0= None

1= Absolute

2= Relative

-50.0..+50.0C

0..99 min.

0= Watch alarm

1= Control alarm

0= No, 1= Yes

-50

+50

41 Start up delay after power failure

Forced relay function at sensor failure 0..99 Minutes

0= None

1= Min.

2= Max.

52 Time correction (at realtimeclock /

network) -99..99 Minutes 0

90 Network number (at network version) 1..31 1

Software version

Production year

Production week

Serial number (x1000)

Serial number (units)

0..255

00..99

1..52

0..255

0..999

*Dimensions.

*Connections.

*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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