VDH ALFA 71 S PI User manual

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User manual
ALFA 71 S PI
Thermostat.
0-100C
VDH doc. 080350 Version: v1.0 Date: 07-03-2008
Software: ALFA71-S-PI 0-100 File: Do080350.WPD Range: 0/+100,0C
*Installation.
On the top side of the ALFA 71 S PI is shown how the sensors, power supply, relays and 0..10Vdc
Solid-State output hastobeconnected.After connectingtheALFA 71 S PI tothe power supply, aself
test function is started. As this test is finished the measured temperature appears in the display.
*Control.
The ALFA 71 S 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.
BypushingtheSET key thesetpoint appearsinthedisplay.Thedecimal pointof thelastdisplaystarts
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 fewseconds after releasing
the keys the measured temperature shows again in the display.
*Status of the Relays.
By pushing thehidden Ckey the display shows thestatus of the relays. Eachdisplay segment shows
thestatus of therelay output, showing 0=off and 1=on. The code 110 meansrelay 1 and 2 are on and
relay 3 is off.
*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 therequiredparameter isselected, the valuecan 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 S PI changes to the normal operation mode.

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*Adjustment sensors.
The temperature sensor can be adjusted by using the Sensor Offset parameter 06.
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 S 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 S PI Thermostat
Range : 0/+100,0C, display per 0,1C
Supply : 12Vac 50/60Hz (-5/+10%)
Display : 3-digit 7-segment display
Relays : 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)
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 Solid State output
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.

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*Parameters ALFA 71 S 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 relay 1)
Function Relay 3 (same as relay 1)
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
Offset PI function (zone)
P-band setting
I-time setting (0 means off)
-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
10
11
12
13
14
15
16
17
18
19
Switch on relay 2 by 0 = Temperature
1 = Time
Switch on relay 3 by 0 = Temperature
1 = 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 differential relay 3
Setpoint offset relay 3
0..1
0..1
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.
0 = Seconds
1 = Minutes
Minimum on-time cooling
Minimum off-time cooling
0..99
0..99
0..1
0..99 Minutes
0..99 Minutes
0
0
0
0
0
25
26
27
Minimum set point
Maximum set point
Read-out above -10C per 1C
-50.0..+50.0C
-50.0..+50.0C
0 = No, 1 = Yes
-50
+50
0
30
31
32
33
34
35
36
37
Alarm type 0 = None
1 = Absolute
2 = Relative
Minimum alarm set point
Maximum alarm set point
Time delay minimum alarm
Time delay maximum alarm
Function alarm relay 0 = Fail safe
alarm 1 = Control alarm
Reset alarm relay after recovering alarm
Reset alarm relay after manual reset
0..2
-50.0..+50.0C
-50.0..+50.0C
0..99 minutes
0..99 minutes
0..1
0= No, 1= Yes
0= No, 1= Yes
1
-50
+50
0
0
0
0
0
40
41 Start up delay after power failure Forced relay function at sensor failure
0 = None
1 = Cool
2 = Heat
0..99 Minutes
0..2 0 0
50
51 Duty Cycle control active Duty Cycle cycle time 0= No, 1= Yes 5..240 Seconds 1 20
95
96
97
98
99
Software version
Production year
Production week
Serial number (x1000)
Serial number (units)
-
-
-
-
-
-
-
-
-
-

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*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