VDH ALFA 71 User manual

1
User manual
ALFA 71 PI Spec.
Thermostat.
With solid state output
VDH doc. 080348 Version: v1.1 Date: 08-10-2010
Software: 042779 ALFA71WA File: Do080348.wpd Range: -50/+50,0C
*Installation.
On the top side of the ALFA 71 PI SPEC is shown how the sensors, power supply, relays and
0..10VdcSolid-State output has to be connected.After connecting theALFA 71 PI SPEC to the power
supply, a self test function is started. As this test is finished the measured temperature appears in the
display.
*Control.
The ALFA 71 PI SPEC 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.
Bypushing the SET key the setpoint appears inthe display. The decimalpointofthe 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.
*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 71 PI SPEC changes to the normal operation mode.

2
*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 PI SPEC 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 SPEC Thermostat with Solid State output
Range : -50/+50,0C, above -10C display per 0,1C
Supply : 12Vac 50/60Hz (-5/+10%) or else see product sticker
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 (Imax. 10mA)
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.
* Function diagram.

3
*Parameters ALFA 71 PI SPEC
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 Solid-State PI-output 0-10V 1 = Cool (on/off)
2 = Cool (PI-mod)
3 = Heat (on/off)
4 = Heat (PI-mod)
1..3
1..3
1..3
1..4
1
2
3
1
05
06
07
Function sensor 2 0 = non
1 = control
2 = alarm
Offset temperature sensor 1
Offset temperature sensor 2
0..2
-15.0..+15.0 C
-15.0..+15.0 C
0
0.0
0.0
10
11
12
13
14
15
16
17
18
19
20
21
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
Set point offset relay 1
Switching differential relay 2
Set point offset relay 2
Switching differential relay 3
Set point offset relay 3
Switching differential solid-state (P04=1,3)
Set point offset solid-state (P04=1,3)
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
0.1..15.0 C
-15..+15 C
0
0
15
15
0.5
0.0
0.5
0.0
0.5
0.0
0.5
0.0
22
23
24
25
26
Switch on delay cooling
Switch off delay cooling
Parameter 22/23 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
27
28
29
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
52
53
54
Setpoint offset PI function (zone)
P-band setting
I-time setting (999 means off)
Duty Cycle time adjustment
PI off: Above set point at heating and below set point at cooling
-30.0..+30.0 C
0.0..+30.0 C
1..999 Seconds
1..999 Seconds
0= No, 1= Yes
0.0
5.0
999
20
0
95
96
97
98
99
Software version
Production year
Production week
Serial number (x1000)
Serial number (units)
-
-
-
-
-
-
-
-
-
-

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: [email protected]
The Netherlands Internet: www.vdhproducts.nl