VDH ALFA(NET) 71 PI User manual

Description
:
Alfa(net)
71
PI
-
10
/+
9
0°
C
Pag
es
:
8
Doc.n
o
:
15
1
04
3
Type:
Manual
By
:
BVDB
Doc.
Versi
on
:
1
.
1
File
:
Do151043 ALFANET 71 PI
-
10_+90°C
Flash V11 EN.docx
Signed
:
Dat
e
:
2
2
-
0
1
-
201
6
VDH Products BV
Software
151121
SW.Version
V3.00
Manual
ALFA(NET)
71
PI
-10/+90°C
1Function
The ALFA(NET) 71 PI is a panel mount thermostat-unit,
with an analog 0-10Vdc PI-output. The thermostat has also three relays outputs selectable for
function cooling, heating or alarm. The temperature is being measured by an SM811 2-Wire
temperature sensor.
The ALFANET 71 PI is provided with an RS-485 network connection and can be readout or set by an
PC with the ALFANET program connected thru an ALFANET PC-Interface.
2Installation
On the connection diagram of the ALFA(NET) 71 PI is shown how the sensors, analogue output,
power supply, relays and optional network are to be connected. After connecting the ALFA(NET) 71
PI to the power supply, a self-test function is started. As this test is finished, the measured
temperature appears in the display.
3Control
The ALFA(NET) 71 PI thermostat can be controlled by four pushbutton on the front. These keys are;
SET - view / change set value and reset alarm.
∏ UP - increase set value.
π DOWN - decrease set value.
°C - hidden relay status key.

ALFA(NET) 71 PI -10/+90°C Doc.no.: 151043 version 1.1
Pagina 2van 8
4Viewing 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.
5Changing 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.
6Status of the relays
By pushing the °C key 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.
7Viewing the PI-output percentage
Push the °C and UP keys simultaneously. Now the PI-output percentage is shown in the display.
8Adjustment sensor
The temperature sensor can be adjusted by using the Sensor Offset parameter 05.
Indicates the Sensor e.g. 2°C too much, the Sensor Offset has to be decreased with 2°C.

ALFA(NET) 71 PI -10/+90°C Doc.no.: 151043 version 1.1
Pagina 3van 8
9Error messages
In the display of the ALFA(NET) 71 PI the following error messages can appear:
Lo1 - Minimum alarm. Solution E1:
Hi1 - Maximum alarm. - Check if the sensor is connected correctly.
E1 - Sensor-1 failure. - Check sensor (1000Ω/25°C).
- Replace sensor.
-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.
10 Technical data
Type
ALFA
71
PI
-
10
/+
9
0°
C
o
r
ALFANET 71 PI -10/+90°C
Range
-
10
/+
9
0
°
C
readout
per 0,1°
C
Supply
12
V
a
c
50/60Hz
(
-
5
…
+10%
)
Display
3
-
digit
7
-
segment
LED display
Sensor
SM 811 2
-
Wire
PTC 1000
Ω
/25°C
Rela
y
s
Ry1 = SPST (NO)
250V/8A cosphi=1 o
r
250V/5A cosphi=0.4
Ry2 = SPST (NO) 250V/8A cosphi=1 or 250V/5A cosphi=0.4
Ry3 = SPDT (NO/NC) 250V/8A cosphi=1 or 250V/5A cosphi=0.4
Relays have one common (C)
Analog
ue
output
0
-
10Vdc PI
-
o
ut
put
Rload = min. 10KOhm
Communicati
on
RS
-
485 Netw
o
rk
Twisted
-
pair
shielded
only at ALFANET A, B, 0V (Twist A and B)
Control
By four push buttons
o
n
t
h
e
front
Front
Polycarbonat
e
Dimensions
35
x 7
7
x
71,5
mm
(
H x W x D
)
Panel
cut out
28
x
70
mm
(
H x W
)
front
mounting
- Provided with memory protection during power failure.
- Connection with screw terminals.
- Equipped with senor failure detection.
- Special versions are on request available.

ALFA(NET) 71 PI -10/+90°C Doc.no.: 151043 version 1.1
Pagina 4van 8
11 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 for more than 10 seconds, to enter the 'Internal Programming Menu'. In the
left display the upper- and lower-segment are blinking.
With the UP and DOWN keys the required parameter can be selected (see the parameter table).
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.
.
11.1 Parameters ALFA(NET) 71 PI
Para
-
meter
D
es
c
ri
ption
P
arameter
Range
Default
value
01
Functi
on
Rela
y
1
1 =
Cool
2 = Heat
3 = Alarm
1..3
1
02
Functi
on
Rela
y
2
same as parm.
P01
1..3
2
03
Functi
on
Rela
y
3
same as parm.
P01
1..3
3
04
Functi
on
PI
-
o
ut
put
1 =
Cool
2 = Heat
3 = Cool and Heat
1..3
1
05
Offset temperatur
e sensor
(Calibration)
-
15.0 .. +15.0°
C
0.0
06
Offset PI
-
15.0 .. +15.0°
C
0.0
07
P
-
band
setting
0.0 ..
2
0.0°
C
5
.0
08
I
-
ti
me
se
tt
ing
(I
-
action
n
o
t
acti
v
e
at
P08 = 0 of P04 = 3)
0 .. 99 Minute
s
0 (=
off
)
10
Switch
-
on
stage two
0 = Temp, 1 = Ti
me
0
11
Switch
-
on stage three
0 = Temp, 1 =Ti
me
0
12
Switch
-
on delay
stage two
0 .. 99 Minute
s
15
13
Switch
-
on delay stage three
0 .. 99
Minute
s
15
14
S
witching
differenti
al
rela
y
1
*
0.1 .. 15.0°
C
0.5
15
S
witching
offset rela
y
1
*
-
15.0 .. +15.0°
C
0.0
16
S
witching
differenti
al
rela
y
2
*
0.1 .. 15.0°
C
0.5
17
S
witching
offset rela
y
2
*
-
15.0 .. +15.0°
C
0.0
18
S
witching
differenti
al
rela
y
3
*
0.1 .. 15.0°
C
0.5
19
S
witching
offset rela
y
3
*
-
15.0 .. +15.0°
C
0.0
20
Switch
-
on delay cooling
0 .. 99
0
21
Switch
-
off delay cooling
0 .. 99
0
22
Parameter 20/21 in second
s
o
r
minute
s
0 = Sec, 1=Min
0
23
Minimum
on
-
ti
me
cool
ing
0 .. 99 Minute
s
0
24
Minimum
off
-
ti
me
coo
ling
0 .. 99 Minute
s
0

ALFA(NET) 71 PI -10/+90°C Doc.no.: 151043 version 1.1
Pagina 5van 8
Para
-
meter
D
es
c
ri
ption
P
arameter
Range
Default
value
25
Minimum
adjustable
setpoint
-
10
.0 .. +
9
0.0°
C
-
10
.0
26
Maximum
adjustable
setpoint
-
10
.0 .. +
9
0.0°
C
+
9
0.0
27
Readout
i
n
whole
de
gr
ees
0 =
N
o
, 1 =
Yes
0
30
A
larm
type
0 =
None
1 = Absolute
2 = Relative
0 .. 2
1
31
Minimum alarm setpoint
-
10
.0 .. +
9
0.0°
C
-
10
.0
32
Maximum alarm setpoint
-
10
.0 .. +
9
0.0°
C
+
9
0.0
33
Ti
me delay
minimum alarm
0 .. 99 Minute
s
0
34
Ti
me delay
maximum alarm
0 .. 99 Minute
s
0
35
Functi
on
alarm rela
y
0 = Wa
tch
alarm
1 = Control alarm
0 .. 1
0
36
Reset alarm rela
y
a
fter
recovering
alarm
0 = N
o
, 1 =
Yes
0
37
Reset alarm rela
y
a
fter
manual
reset
0 = N
o
, 1 =
Yes
0
40
Start
-
up delay after
power
failure
*
0 .. 99 Minute
s
0
41
F
orced rela
y
functi
on
at
sensor failure
0 = None
1 = Cool
2 = Heat
0 .. 2
0
90
Netw
o
rk
num
b
er
(
only
at
ALFANET)
1..250
1
95
Software versi
on
-
-
96
Producti
on
yea
r
-
-
97
Producti
on
week
-
-
98
Seri
al
num
b
er (x1000)
-
-
99
Seri
al
num
b
er (
units
)
-
-
*) These parameters are only applied to relays with function cool or heat.

ALFA(NET) 71 PI -10/+90°C Doc.no.: 151043 version 1.1
Pagina 6van 8
12 Function diagram

ALFA(NET) 71 PI -10/+90°C Doc.no.: 151043 version 1.1
Pagina 7van 8
13 Connections

ALFA(NET) 71 PI -10/+90°C Doc.no.: 151043 version 1.1
Pagina 8van 8
14 Dimensions
15 Address
VDH Products B.V.
Tel.:
+31 (0)50
–
30 28 900
Productieweg 1
Fax.:
+31 (0)50
–
30 28 980
9301 ZS Roden
Email:
[e-mail]
The
Ne
th
erland
s
Internet:
www.vdhproducts.nl