VDH Products ALFA 71 PI SSR 24Vdc User manual

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User manual
ALFA 71 PI SSR 24Vdc
Thermostat
Open collector Solid State Relay output
VDH doc. 100698 Version: v1.0 Date: 06-10-2010
Software: 100801 ALFA71 PI SSR File: Do100698.wpd Range: -50/+50,0C
*Installation.
On the top side of the ALFA 71 PI SSR 24Vdc is shown how the sensors, power supply, relays and
Solid-State output has to be connected. After connecting the ALFA 71 PI SSR 24Vdc 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 SSR 24Vdc 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.
Bypushingthe SET key the setpoint appearsinthedisplay.Thedecimalpointofthe lastdisplaystarts
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 100 means relay 1 is on and relay
2is off. A few seconds after releasing the keys the measured temperature shows again in the display.
*PI-percentage.
By pushing the UP key the display shows the internal PI-percentage (for P04=2,4) or the status of the
solid state output (for P04=1,3). For the solid state output, 100 means on, 0 means off. 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, 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 SSR 24Vdc 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 PI SSR 24Vdc 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 SSR 24Vdc Thermostat with Solid State output
Range : -50/+50,0C, above -10C display per 0,1C
Supply : 24Vdc (16...35Vdc Abs. Max.)
Display : 3-digit 7-segment display
Relays : Ry1= SPST(NO) 250V/8A (cos=1) or 250V/5A (cos =0.4)
Ry2= SPST(NO) 250V/8A (cos=1) or 250V/5A (cos =0.4)
Control : By push buttons on front.
Front : Polycarbonate IP65
Sensor : SM 811/2m (PTC 1000/25C).
Solid State output : Open collector Solid State output (Max. 250mA, 24Vdc)
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 diagrams.

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*Parameters ALFA 71 PI SSR 24Vdc
Para-
meter Description Parameter Range Default
01
02
04
Function Relay 1 1 = Cool
2 = Heat
3 = Alarm
Function Relay 2 1 = Cool
2 = Heat
3 = Alarm
Function Solid-State open collector output
1 = Cool (on/off)
2 = Cool (PI-mod)
3 = Heat (on/off)
4 = Heat (PI-mod)
1..3
1..3
1..4
1
2
1
06 Offset temperature sensor 1 -15.0..+15.0 C0.0
10
12
14
15
16
17
20
21
Switch on relay 2 by 0 = Temperature
1 = Time
Switch on delay relay 2 (P10=1)
Switching differential relay 1
Setpoint offset relay 1
Switching differential relay 2
Setpoint offset relay 2
Switching differential solid-state (P04=1,3)
Setpoint offset solid-state (P04=1,3)
0..1
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
15
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 Seconds or Minutes
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)
-
-
-
-
-
-
-
-
-
-

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