VDH ALFANET 33 User manual

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User Manual ALFANET 33
Min./Max. Alarm thermostat.
VDH doc. 032758 Version: v1.0 Date: 03-12-2003
Software: ALFANET 33 File: Do032758.WP8 Range: -50/+50°C, readout per 1°C
*Installation.
On the topside of the ALFANET 33 you can see how the sensor, power supply and relay have to be
connected.
After connecting the ALFANET 33 to the power supply, a self test function is started. As this test is
finished, the measured temperature appears in the display.
The relay is normally activated, with an alarm it’s not activated, then the led 'on' will light-up in the
display.
*Control.
The ALFANET 33 alarm thermostat can be controlled by three pushbuttons on the front;
SET - view / change setpoints and reset of alarm.
UP - increase a value.
DOWN - decrease a value.
*Viewing setpoints.
Viewing setpoint of maximum alarm:
By pushing the SET key first and then the UP key together the maximum alarm setpoint appears
in the display. The led 'set high' starts blinking.
Viewing setpoint of minimum alarm:
By pushing the SET key first and then the DOWN key together the maximum alarm setpoint appe-
ars in the display. The led 'set low' starts blinking.
Afew seconds after releasing the keys the setpoint disappears and the measured temperature is
shown in the display.
*Changing setpoints.
Push the SET key together with the UP or DOWN key and the maximum alarm setpoint or minimum
alarm setpoint appears in the display. Release both keys.
Now push the SET key again and together with the UP or DOWN keys the setpoint can be changed.
A few seconds after releasing the keys the measured temperature shows again in the display.

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*Actions of the alarm functions.
TheALFANET 33 alarm thermostat has a minimum alarm and a maximum alarm both with there own
setpoint. We can choose two different kinds of alarms (PARAMETER 27) namely:
watchdog alarm (relay normally activated, with alarm it falls off and the led 'alarm' burns. So on
power failure the alarm relay also falls off.)
or a regulated alarm(relay normally not activated, with alarm the relay will be activated and the led
'alarm' will burn.
WithPARAMETER 28 we can choose auto reset alarm or a hold alarm, after temperature recovering.
Also it is possible to give both setpoints their own offset and differential see function diagram. Each
alarm can be set at an alarm-delay time (PARAMETER 23 and 24) when the temperature will give
an alarm the led 'alarm' first starts to blink. If the temperature will recover within the delay time, no
alarm occurs. If an alarm will come through after the delay time the led 'alarm' burns continuously and
thedisplay alternates between the temperature and 'H' for high-alarm (max.) or 'L' for low-alarm (min.)
to indicate the alarm.
To reset an alarm, press the SET key.
*Setting internal parameters.
Next to the adjustment of the setpoint, some internal settings are possible like differential, sensor-
offset, setpoint range.
By pushing the DOWN key more than 10 seconds, you enter the 'internal programming menu'. In the
left display the upper- and lower-segment are blinking. With theUP 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 and DOWN keys, allows you to change the
valueof this parameter. If after 20 seconds no key is pushed, the ALFANET 33 changes to it's normal
operation mode.
*Sensor adjustment.
The sensor can be adjusted by using the Sensor Offset (parameter 04). Indicates the ALFANET 33
e.g. 2°C too much, the Sensor Offset has to de decreased by 2°C.
*Error messages.
In the display of the ALFANET 33 the following error messages can appear:
E1 - Sensor broken. Solution:
- Check if the sensor is connected correctly.
- Check the sensor (1000Ωat 25°C).
- Replace the sensor.
EE - Settings are lost. Solution:
- Re programme the settings.
-L- - In case of sensor short-circuit the display alternates between error-code E1
and -L-, as indication for a short-circuit sensor.
-H- - In case of open-circuit sensor the display alternates between error-code E1
and -H-, as indication for a open circuit sensor.

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* Technical data.
Type : ALFANET 33 alarm thermostat
Range : -50/+50°C, readout per 1°C
Supply : 12 Vac / 16,5Vdc (-5/+10%)
Relay : SPDT 250V/16A(C-NO), 8A(C-NC) (cos phi=1)
Communication : RS485-network (2-wire shielded cable, min. 0,75mm2)
Control : thru pushbuttons on front.
Front : Polycarbonate IP65
Sensor : SM 811/2m.
Dimensions : 35 x 77 x 71,5mm (hwd)
Panel cut-out : 28 x 70mm (hw)
- Provided with memory protection during power failure.
- Connection with screw terminals on the backside.
- Equipped with self test function and sensor failure detection.
- Special version are available upon request.
*Parameters ALFANET 33.
PARA-
METER DESCRIPTION PARAMETER RANGE DEFAULT VALUE
02
03
04
10
11
21
22
23
24
25
26
27
28
Minimum setpoint
Maximum setpoint
Offset temperature sensor
Startup delay after power failure
Relay on at sensor failure
Differential maximum alarm
Differential minimum alarm
Time delay maximum alarm
Time delay minimum alarm
Offset setpoint High (Max.)
Offset setpoint Low (Min.)
Relay alarm function
(0=watchdog 1=regulated alarm)
Auto reset alarm after temp.
recovering (0=hold)
-50..+50°C
-50..+50°C
-15..+15°C
0..99 min.
0 = Nee
1 = Ja
1..15°C
1..15°C
0..99 min.
0..99 min.
0..+20°C
-20..0°C
0 = Nee
1 = Ja
0 = Nee
1 = Ja
-50
+50
0
0
0
1
1
0
0
+1
-1
0
0
52 Time correction
(at realtime clock) -99..+99 0
90
95
96
97
98
99
Network number
Software version
Production year
Production week
Serial number (x1000)
Serial number (units)
1..255
0..255
00..99
1..52
0..255
0..999
1
-
-
-
-
-
*Address.
VDH Products BV Tel: +31 (0)50 - 30 28 900
Produktieweg 1 Fax: +31 (0)50 - 30 28 980
9301 ZS Roden Email: [email protected]
Nederland Internet: www.vdhproducts.nl

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*Dimensions.
*Connections.
* Function diagram.