VDH ALFANET 71 User manual

Description
:
Alfa(net)
71
1
2V
a
c
0
/
+100
°C
Pag
es
:
8
Doc.
No.
:
1
7098
2
Type:
Manual
By
:
BVDB
Versi
on
:
1
.0
File
:
Do170982 ALFANET 71 0_+100°C Flash
V10 EN.docx
Paraph
:
Dat
e
:
1
7
-
0
8
-
201
7
VDH Products BV
User manual
ALFA(NET)
71
0/+100°C
1Function
The ALFA(NET) 71 is a panel mount thermostat-unit. The thermostat has also three relays outputs
selectable for function cooling, heating or alarm. The temperature is measured by sensor-1 unless
sensor-2 is active as control sensor (P05=1), in this case the average temperature of both sensors
(SM 811 2-wire) is displayed and used for control.
The ALFANET 71 is provided with an RS-485 network connection allowing to read out and set this
unit on the ALFANET.
2Installation
On the connection diagram of the ALFA(NET) 71 is shown how the sensor(s), power supply, relays,
and optional network should be connected. After connecting the ALFA(NET) 71 to the power supply,
a self-test program is started. As the test is finished the measured temperature appears in the
display.
3Control
The ALFA(NET) 71 thermostat can be controlled by four pushbuttons on the front.
These keys are;
8 SET - view / change the set value and reset alarm.
∏ UP - increase the set value.
π DOWN - decrease the set value.
°C STATUS - relay status key.

ALFA(NET) 71 0/+100°C Document No.: 170982 Version 1.0
Pagina 2 van 8
4View set point
By pushing the SET key the set point appears in the display. The decimal point of the most right
display starts blinking. A few seconds after releasing the SET key the set point disappears and the
measured temperature is shown again in the display.
5Change set point
Push the SET key and the set point appears in the display. Release the SET key. Now push the SET
key again together with the UP or DOWN keys to change the set point. A few seconds after
releasing the keys the measured temperature is shown again in the display.
6Viewing the individual sensors.
By pressing the UP and DOWN keys together, the individual sensors can be shown in the display.
After releasing the keys, the measured temperature of sensor-1 can be shown by pushing the UP
key, or the measured temperature of sensor-2 can be shown by pushing the DOWN key.
A few seconds after releasing the keys the measured temperature is shown again in the display.
7Status 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.
8Adjustment sensors
Sensor-1 can be adjusted by using the Sensor Offset parameter 06 and Sensor-2 can be adjusted
by using the Sensor Offset parameter 07. Indicates a Sensor e.g. 2oC to much, the according
Sensor Offset has to be decreased by 2oC.

ALFA(NET) 71 0/+100°C Document No.: 170982 Version 1.0
Pagina 3 van 8
9Error messages
In the display of the ALFA(NET) 71 the following error messages can appear:
E1 - Sensor-1 failure. Solution E1, E2:
E2 - Sensor-2 failure. - Check if sensor is connected correctly.
Lo1 - Minimum alarm on sensor-1. - Check sensor (1000Ω/25°C).
Hi1 - Maximum alarm on sensor-1. - Replace sensor.
Lo2 - Minimum alarm on sensor-2.
Hi2 - Maximum alarm on sensor-2.
Resetten Alarm. When an error-messages appears it can be resetted by pushing the SET
key. The function of this key depends on parameter P37.
If an sensor failure E1 or E2 is still present after confirmation (SET) the alarm, the controller will
alternately display E.. and – L – at an short circuit of the sensor or E.. and – H – at an interrupted
circuit of the sensor.
10 Technical data
Type
ALFA
71
0
/
+100
°
C
o
r
ALFANET 71 0/+100°C
Range
0
/
+100
°C
uitlezing per 0,1°
C
Supply
1
2 V
a
c
50/60Hz
, 3VA
(
-
5
…
+10%
)
Display
3
-
digit
7
-
segments
LED display
Sensor
s
2x
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)
Communicati
on
RS
-
485 Netw
o
rk
Twisted
-
pair afgeschermd
only at ALFANET A, B, 0V (A and B twisted)
Control
By
four
push buttons on
front
Front
Polycarbonat
e
Dimensions
35
x
77
x
71,5
mm
(
H x
W
x D
)
Panel
c
ut
out
28
x
70
mm
(
H x
W
)
for
front
mounting
- Provided with memory protection during power failure.
- Connections with screw terminals on the back side.
- Equipped with sensor failure detection.
- Special versions are on request available.

ALFA(NET) 71 0/+100°C Document No.: 170982 Version 1.0
Pagina 4 van 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 changes to the normal operation mode.
11.1 Parameters ALFA(NET) 71
Para
-
meter
D
escri
ption
Range
Default
value
01
Functi
on
r
ela
y
1
1 =
Cooling
2 = Heating
3 = Alarm
1..3
1
02
Functi
on
r
ela
y
2
same
as
param.
P01
1..3
2
03
Functi
on
r
ela
y
3
same
as
param.
P01
1..3
3
05
Functi
on
sensor
-
2
0 =
None
1 = Control
2 = Alarm
0..2
0
06
Offset temperatur
e sensor
-
1
-
15.0 .. +15.0°C
0.0
07
Offset temperatur
e senso
r
-
2
-
15.0 .. +15.0°C
0.0
10
Switch
-
on
rela
y
2
(on temp. or time)
#
0 = Temp, 1 = Ti
me
0
11
Switch
-
on
rela
y
3
(on temp. or time)
#
0 = Temp, 1 =Ti
me
0
12
Switch
-
on delay
rela
y
2
#
0 .. 99 Minute
s
15
13
Switch
-
on delay
rela
y
3
#
0 .. 99 Minute
s
15
14
S
witching d
ifferenti
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
wit
ch
ing
differenti
al
rela
y
2
*
0.1 .. 15.0°
C
0.5
17
S
wit
ch
ing
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
wit
ch
ing
offset rela
y
3
*
-
15.0 .. +15.0°
C
0.0
20
Swit
ch
-
on delay
c
o
o
ling
0
.. 99
0
21
Switch
-
off delay
c
o
o
ling
0 .. 99
0
22
Parameter 20/21 in second
s
o
r
minute
s
0 = Sec
.
, 1=Min
.
0
23
Minimum
on
-
ti
me
c
o
o
ling
0 .. 99 Minute
s
0
24
Minimum
off
-
ti
me
c
o
o
ling
0 .. 99 Minute
s
0
25
Minimum
adjustable
set
point
0
.0 ..
+100
.0°
C
0
.0
26
Maximum
adjustable
set
point
0
.0 ..
+100
.0°
C
+100
.0

ALFA(NET) 71 0/+100°C Document No.: 170982 Version 1.0
Pagina 5 van 8
Para
-
meter
D
escri
ption
Range
Default
value
27
Readout
o
n
whole degrees
0 =
N
o
, 1 =
Yes
0
30
A
larm
type
0 =
None
1 = Absolute
2 = Relative
0 .. 2
1
31
Minimum alarm set
point
0
.0 ..
+100
.0°
C
0
.0
32
Maximum alarm set
point
0
.0 ..
+100
.0°
C
+100
.0
33
Time delay on
minimum alarm
0 .. 99
Minute
s
0
34
Ti
me delay on
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
year
-
-
97
Producti
on
week
-
-
98
Seri
al
num
b
mer (x1000)
-
-
99
Seri
al
num
b
er (
units
)
-
-
*) These parameters are only applied to relays with the function cool or heat.
#) These parameters apply if the controller is set as multi-stage (2 or 3 stages (cooling, heating or
alarm)) and are fixed coupled to the relay number.

ALFA(NET) 71 0/+100°C Document No.: 170982 Version 1.0
Pagina 6 van 8
12 Function diagram

ALFA(NET) 71 0/+100°C Document No.: 170982 Version 1.0
Pagina 7 van 8
13 Connections

ALFA(NET) 71 0/+100°C Document No.: 170982 Version 1.0
Pagina 8 van 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