VDH ALFA 71 PI User manual

1
User manual
ALFA 71 PI and
ALFANET 71 PI
-10/+90OC
Thermostat.
VDH doc. 080190 Version: v1.0 Date: 28-01-2008
Software: 071107_ALFA71PI -10/90 File: Do080190.wpd Range: -10/+90,0C
*Installation.
On the top side of the ALFANET 71 PI is shown how the sensors, power supply, relays and 0..10Vdc
PI output has to be connected. After connecting the ALFANET 71 PI to the power supply, a self test
function is started. As this test is finished the measured temperature appears in the display.
And the ALFANET -71 PI is by use of the ALFANET PC-INTERFACE controllable on the PC.
*Control.
The ALFA(NET) 71 PI 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
key again 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.
*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.

2
*Error messages.
In the display of the ALFA(NET) 71 PI 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 the SET key. The
function of this key depends on parameter P37.
* Technical details.
Type : ALFA 71 PI Thermostat or
ALFANET 71 PI Thermostat with network
Range : -10/+90,0C, display per 0,1C
Supply : 12Vac / 3VA, 50/60Hz, -5/+10% (or else see product sticker)
Display : 3-digit 7-segment display
Relays : Relays have one common (C).
Ry1= SPST(NO) 250V/8A (cos=1) of 250V/5A (cos =0.4)
Ry2= SPST(NO) 250V/8A (cos=1) of 250V/5A (cos =0.4)
Ry3= SPDT(NO/NC) 250V/8A (cos=1) of 250V/5A (cos =0.4)
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)
Communication : RS485-Network (2xTwisted-pair shielded cable min. 0,5mm2) only ALFANET
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.
*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(NET) 71 PI changes to the normal operation mode.

3
*Parameters ALFANET 71 PI
Para-
meter
Description Parameter Range Default
01
02
03
04
Function Relay 1 1=Cool
2=Heat
3=Alarm
Function Relay 2 (same as parm. P01)
Function Relay 3 (same as parm. P01)
Function PI-output 1=Cool
2=Heat
1..3
1..3
1..3
1..2
1
2
3
1
05
06
07
08
Offset temperature sensor-1
Setpoint offset PI function
P-band setting
I-time setting
-15.0..+15.0C
-15.0..+15.0C
0.0..+20.0C
0..99 Minutes
0.0
0.0
5.0
0 (off)
10
11
12
13
14
15
16
17
18
19
Switch on relay 2 by temperature or time
Switch on relay 3 by temperature or time
Switch on delay relay 2
Switch on delay relay 3
Switching differential relay 1
Setpoint offset relay 1
Switching differential relay 2
Setpoint offset relay 2
Switching differentia relay 3
Setpoint offset relay 3
0=Temperature, 1=Time
0=Temperature, 1=Time
0..99 Minutes
0..99 Minutes
0.1..15.0C
-15..+15C
0.1..15.0C
-15..+15C
0.1..15.0C
-15..+15C
0
0
15
15
0.5
0.0
0.5
0.0
0.5
0.0
20
21
22
23
24
Switch on 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
-10.0..+90.0C
-10.0..+90.0C
0= No, 1= Yes
-10
+90
0
30
31
32
33
34
35
36
37
Alarm type 0= None
1= Absolute to setpoint
2= Relatief to setpoint
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..2
-10.0..+90.0C
-10.0..+90.0C
0..99 Minutes
0..99 Minutes
0= Watch alarm
1= Control alarm
0= No, 1= Yes
0= No, 1= Yes
1
-10
+90
0
0
0
0
0
40
41
Start up delay after power failure
Forced relay function at sensor failure
0..99 Minutes
0= None
1= Cool
2= Heat
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
-
-
-
-
-
1
-
-
-
-
-

4
*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: [e-mail]
The Netherlands Internet: www.vdhproducts.nl