VDH ALFANET 85 Manual de usuario

User manual

ALFANET 85

Cool thermostat with fan

and defrost control

VDH doc. 080645 Version: v1.0 Date: 19-05-2008

Software: ALFANET85 File: Do080645.WPD Range -40/+50°C

*Installation.

On the side of the ALFANET 85 and on the connection diagram is shown how to connect sensors,

power supply and the relays.

After connecting the ALFANET 85 to the power supply a self-test function is started. Next the

measured temperature of the control sensor is shown in the display (normal operation mode).

*Control.

The ALFANET 85 thermostat can be controlled by four push buttons on the front.

These keys are:

SET : view/change the set point

UP : increase the set point

DOWN : decrease the set point

DEFROST : manual start/stop the defrost

*View set point.

By pushing the SET key, the set point is shown. Also the decimal point of the most right display

starts flashing. A few seconds after releasing the SET key, the set point disappears and the

measured value is shown again.

*Changing set point.

Push the SET key to show the set point. Release the set key. By pushing the SET key

simultaneously with the UP or DOWN keys the set point can be changed. A few seconds after

releasing the set key the measured value is shown on the display.

*Read-out defrost sensor.

Push the UP key to show the value of the defrost temperature sensor.

*View clock time.

Push the UP and DOWN keys simultaneously. The display will show the present time. The decimal

point between hours and minutes starts flashing.

*Changing time.

Push the UP and DOWN key simultaneously to show the time. By pressing the SET key

simultaneously with the UP or DOWN key the time can be set. A few seconds after releasing the

keys, the measured value is shown in the display.

*Start/stop defrost cycle.

The defrost cycle is automatically started and stopped. Settings by via the Internal Parameters.

The defrost can be changed manually:

STOP : If defrost is on, the defrost can be stopped manually by pushing the DEFROST

key.

START : If no defrost is on, the defrost can be started manually by pressing the DEFROST

key.

*Setting internal parameters.

Next to the adjustment of the set point a number of internal settings are possible, like differentials,

sensor offsets, set point range, cooling settings, fan settings and defrost settings.

By pushing the DOWN key for more than 10 seconds, the 'Internal Parameter Menu' is entered.

The display shows P01. By the UP and DOWN keys the required parameter can be selected (see

table for parameters).

When the required parameter is selected, press the SET key to show the value of thisparameter.

By pushing the UP or DOWN keys the parameter value can be changed.

If for 30 seconds no key is pressed, the ALFANET 85 will return to its normal operation mode and

the changes are stored.

*Adjustment of sensors.

The control sensor can be adjusted withe the 'offset control sensor' (parameter 05). Indicates the

control sensor e.g. 1,2°C too much, the sensor offset should be reduced with 1,2°C. The defrost

sensor is adjusted with the 'offset defrost sensor' (parameter 07).

*Reset of alarm.

During alarm the alarm relay and the internal buzzer are activated. By pressing the SET key the

buzzer will stop and the alarm relay, depending on the internal settings, will drop. The error

message remains flashing in the display, until the cause of the failure is solved.

*Fan control options.

The ALFANET 85 has various settings for the evaporator fan. Normally the fan runs continuously,

except if one the the parameters mentioned below is set to 1.

Parameter 20 = 1 Fan switch differential active

The fan only runs if the temperature of the defrost sensor is lower than the temperature of the

control sensor minus the fan switch differential (P 21)

Parameter 24 = 1 Fan off during defrost.

To prevent that after the defrost and drip-off time the fan starts to run and warm air is blown

into the cold room, two conditions can be set:

a. The fan is blocked until the defrost sensor reaches a temperature lower than the

temperature set with parameter 25.

b. The fan is blocked until the defrost delay of parameter 26 has passed, unless the defrost

sensor reaches the switch-on temperature of parameter 25. If the defrost sensor is broken,

the ALFANET 85 will run he time of parameter 26 before the fan is started.

Parameter 22 = 1 Fan off if cooling off.

The fan is stopped if the cooling is stopped. This is done through the delay of parameter 23.

*Defrost control options.

The automatic defrost is started by the defrost interval time and stooped after the maximum

defrost time or sooner is the defrost sensor reaches the set end-of-defrost temperature. The

ALFANET 85 has various automatic defrost options that can be set with the following parameters.

Parameter 34 = 0 Defrost with fixed defrost intervals.

Hereby parameter 30 is always the selected interval time.

Parameter 34 = 1 Defrost based on the total cooling run time.

Hereby the defrost is started if the cooling has run the time set with parameter 30.

Parameter 38 = 1 The ALFANET 85 start with defrost when switched on.

The ALFANET 85 starts with a defrost cycle if the ALFANET 85 is switched on, whereby first

the defrost-swtich-on-delay (parameter 39) is passed. During this delay the cooling can be on,

after which the defrost is started.

Parameter 33 = 1 For hot-gas-defrost systems the cooling is switched on during defrost.

After the defrost the drip-off time (parameter 37) is started. During this time the defrost relay is

not active and the evaporator can drip off. During this time the cooling will not run.

*Parameters ALFANET 85.

Para-

meter Description Range Default

Value

P 01

P 02

P 03

P 04

P 05

Switch differential cooling

Minimum set point setting

Maximum set point setting

Offset control sensor

Offset defrost sensor

0.1..15.0C

-40.0..50.0C

-10.0..10.0C

0.5

-40.0

50.0

0.0

P 10

P 11

P 12

P 13

P 14

Switch on delay cooling

Switch off delay cooling

Parameter 10/11 in seconds or

minutes

Minimum on time cooling

Minimum off time cooling

0..99

0 = sec 1 = min

0..99 minutes

P 20

P 21

P 22

P 23

P 24

P 25

P 26

Fan switch differential active

Switch differential fan

Fan off if cooling off

Switch off delay fan

Fan off during defrost

Switch on temperature fan after

defrost

Switch on delay after defrost

0 = No 1 = Yes

0.1..50.0C

0 = No 1 = Yes

0..99 minutes

0 = No 1 = Yes

-50.0..50.0C

0..99 minutes

2.0

P 30

P 31

P 32

P 33

P 34

P 35

P 36

P 37

P 38

P 39

Defrost interval time

Maximum defrost time

End-of-defrost temperature

Cooling on during defrost

Defrost on compressor run time

Display fixed during defrost

Maximum display fixed time

after defrost

Drip-off time

Start with defrost after power

failure

Defrost delay after start-up

1..99 hours.

0..99 minutes

-40.0..50.0C

0 = No 1 = Yes

0..99 minutes

0 = No 1 = Yes

0..99 minutes

2.0

P 40

P 41

P 42

P 43

P 44

P 45

P 46

P 47

P 48

Defrost on real time bases

Start defrost 1

Start defrost 2

Start defrost 3

Start defrost 4

Start defrost 5

Start defrost 6

Start defrost 7

Start defrost 8

0 = No 1 = Yes

00:00..23:59,OFF

00:00

04:00

08:00

12:00

16:00

20:00

OFF

P 50

P 51

P 52

P 53

P 54

P 55

P 56

Type alarm

Minimum alarm set point

Maximum alarm set point

Time delay minimum alarm

Time delay maximum alarm

Reset alarm when alarm

disappears

Alarm relay off after manual

reset of alarm

0 = none

1 = absolute

2 = relative

-40.0..50.0C

0..99 minutes

0 = No 1 = Yes

-40.0

50.0

Para-

meter Description Range Default

Value

P 80

P 81

P 82

P 83

Cooling and fan off when door open

Maximum cooling and fan off time

when door open

Control delay after power failure

Cooling on at sensor failure

0 = No 1 = Yes

0..99 min.

0..99 min

0 = No 1 = Yes

P 90

P 91

P 95

P 96

P 97

RS 485 network number

Log interval

Software version

Production date

Serial number

1..255

1..60 min

*Error messages.

In the display of the ALFANET 85 the following alarm messages can be shown.

Lo 1 : minimum alarm control sensor

Hi 1 : maximum alarm control sensor

E 1*: control sensor broken

E 2*: defrost sensor broken

EE1/EE2 : settings are lost

Solution E1/E2 : Check if sensor is connected correctly

Check the sensor (1000/25C)

Replace sensor

Solution EE1/EE2 : Program settings again

-L- In case of a short in the sensor the display will alternate between the error code E.. and -L-

to indicate a short of the sensor

-H- In case op an open sensor circuit the display will alternate between the error code E.. and -

H- to indicate and open sensor circuit.

*Technical data.

Type : ALFANET 85 thermostat

Range : -40/+50C with read-out per 0,1C

Supply : 12 Vdc/ac 50/60Hz (-5/-10%)

Read-out : 4 number 7 segment display

Status LED : cool, fan, defrost, alarm

Relay cooling : SPST 250V/8A (cos phi=1)

Relay defrost : SPST 250V/8A (cos phi=1)

Relay fan : SPST 250V/8A (cos phi=1)

Relay alarm : SPST 250V/8A (cos phi=1)

Control : by four push buttons on the front

Front : polycarbonate

Sensor : 2x SM 811/2m (PTC 1000/25C)

Digital input : door contact (potential free)

Communication : RS 485 (2x twisted pair shielded min. 0.8mm2)

Dimensions : 106x90x58mm (whd)

Accuracy : ± 0,5% of the range

- Provided with memory protection during power failure.

- DIN-rail mounting.

- Provided with self test function and sensor failure detection.

- Special models available upon request.

*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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