VDH ALFA 11 User manual

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User manual
ALFA 11 and
ALFANET 11
0/+99OC(1)
Cool / Heat
Thermostat.
VDH doc: 071464 Version: v2.0 Date: 22-11-2007
Software: 053273_ALFA 11/21/31_0-100CFile: Do071464.wpd Range: 0/+99C per 1C
* Function.
The ALFA(NET) 11 is a digital thermostat for rail mounting. The function from the thermostat can be
programmed for cooling or heating. The temperature readout is in hole degrees Celsius.
The ALFANET 11 has a RS 485 network connection so it can be read out and adjusted on the Alfanet.
*Installation.
On the connection diagram of the ALFA(NET) 11 is shown how the sensor, power supply and relay
have to be connected.
After connecting the ALFA(NET) 11 to the power supply, a self-test function is started. As this test is
finished the measured temperature appears in the display.
When the relay is activated, the led 'on' will light-up in the display.
*Control.
The ALFA(NET) 11 thermostat can be controlled by three push buttons on the front.
These keys are:
SET - view / change the setpoint.
UP - increase the setpoint.
DOWN - decrease the setpoint.
*Viewing setpoint.
By pushing the SET key the setpoint appears in the display. The led 'set' starts blinking. A few seconds
after releasing the SET key the setpoint disappears and the measured temperature is shown in the
display.

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*Changing setpoint.
Push the SET key and the setpoint appears in the display. Release the at SET key. 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.
*Setting internal parameters.
Next to the adjustment of the setpoint, some internal settings are possible like differential, sensor-
offset, setpoint range and the function cooling or heating.
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. 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 keys together with the SET key allows you to change the value of this parameter.
If after 20 seconds no key is pushed, the ALFA(NET) 11 changes to it's normal operation mode.
*Parameters ALFA(NET) 11.
Para-
Meter
Description Parameter Range Standard
Value
01
02
03
04
Switching differential
Minimum setpoint
Maximum setpoint
Offset temperature sensor
1..30C
0..+99C
0..+99C
-15..+15C
3
0
+99
0
10
11
Startup delay after power failure
Relays on at sensor failure
0..99 Minutes
0 = No
1 = Yes
0
0
15
16
17
18
19
20
Function cooling or heating
Switch on delay relays 1)
Switch off delay relays 1)
Parameter 16/17 in seconds or minutes
Minimum on-time relays
Minimum off-time relays
0 = Cool
1 = Heat
0..99
0..99
0 = Seconds
1 = Minutes
0..99 Minutes
0..99 Minutes
0
0
0
0
0
0
90
95
96
97
98
99
Network number
Software version
Production year
Production week
Serial number (x1000)
Serial number (units)
1..250
0..255
00..99
1..52
0..255
0..999
1
-
-
-
-
-
1) At active delay LED ‘on’ flashes

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*Adjustment sensor.
The sensor can be adjusted by using the Sensor Offset (parameter 04). Indicates the ALFA(NET) 11
e.g. 2C too much, the Sensor Offset has to de decreased with 2C.
*Error messages.
In the display of the ALFA(NET) 11 the following error messages can appear:
Er - Sensor broken. Solution:
- Check if the sensor is connected correctly.
- Check the sensor (1000at 25C).
- Replace the sensor.
EE - Settings are lost. Solution:
- Reprogram the settings.
* Technical details.
Model : ALFA 11 Cool/Heat Thermostat
ALFANET 11 Cool/Heat Thermostat with Network
Range : 0/+99C, readout per 1C
Supply : 230 Vac / 1,2VA 50/60Hz (or else see product sticker)
Relay : SPDT 250V/16A(C-NO), 8A(C-NC) (cos phi=1)
Control : by push buttons on the front.
Communication : RS485-Network (2x twisted-pair shielded, min. 0,5mm2)
Front : Polycarbonate
Sensor : SM 811/2m (1000at 25C)
Sizes : 90 x 53 x 58mm (hwd)
Panel hole : 46 x 53mm (hw)
- Provided with memory protection during power failure.
- Connection with screw terminals on the back side.
- Equipped with self test function and sensor failure detection.
- Special version on request available.
* Function diagram.

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*Dimensions. *Connections.
*Address.
VDH Products BV Tel: [phone]
Produktieweg 1 Fax: [phone]
9301 ZS Roden Email: [e-mail]
The Netherlands Internet: www.vdhproducts.nl