VDH ALFANET 79 PI User manual

Description:
Alfa(net)
79 PI
0/100%RH
Pages:
8
Doc.no.:
1
70986
Type:
User manual
By:
BVDB
Version:
1.0
File:
Do170986 ALFANET 79 PI 0_100%RH
Flash V10 EN.docx
Signed:
Date:
1
6
-
08
-
201
7
VDH Products BV
Software:
1
70962
User manual
ALFA(NET)
79 PI
0/100%RH
1Function
The ALFA(NET) 79 PI is a Panel mount hygrostat-unit. The hygrostat has three relay outputs
selectable for function humidify, dehumidify or alarm. And an PI-output 0-10Vdc for function
humidify or dehumidify. The relative humidity is being measured by a RH-sensor (Relative
Humidity) with an 0-1Vdc = 0-100%RH signal output.
The ALFANET 79 PI is provided with a RS-485 network connection, with which it can be readout or
set on the ALFANET.
2Installation
On the connection diagram of the ALFA(NET) 79 PI is shown how the sensor, power supply, relays,
PI-output and optional network are to be connected. After connecting the ALFA(NET) 79 PI to the
power supply, a self-test function is started. As this test is finished, the measured relative humidity
appears in the display.
3Control
The ALFA(NET) 79 PI hygrostat can be controlled by four pushbuttons on the front. These keys are;
8 SET - view / change set value and reset alarm.
∏ UP - increase set value.
π DOWN - decrease set value.
%RH STATUS - hidden relays status key.

ALFA(NET) 79 PI 0/100%RH Document no.: 170986 version 1.0
Pagina 2 van 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 %RH 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.
7Adjustment sensor
The RH-sensor can be adjusted by using the Offset RH-Sensor parameter 05. Indicates the Sensor
e.g. 2%RH too much, the Offset RH-Sensor parameter has to be decreased with 2%RH.
8Error messages
In the display of the ALFA(NET) 79 PI the following error messages can appear:
E1 - RH sensor failure*. Solution E1:
rLo - Minimum RH alarm. - Check if RH-sensor is connected correctly.
rHi - Maximum RH alarm - Check RH-signal (0/100%RH=0/+1Vdc).
- Replace RH-sensor.
*) -H- - In case that the signal input voltage is greater than 1,0 Volt, the display
Shown alternating E1 and -H-, to indicate a false RH-sensor.
Reset Alarm. When an error-message appears it can be reset by pushing the SET key.
The function of this key depends on parameter P37.

ALFA(NET) 79 PI 0/100%RH Document no.: 170986 version 1.0
Pagina 3 van 8
9Technical data
Type
ALFA
79 PI
of
ALFANET 79 PI
Range
0
/
10
0
%RH
readout
per 1
%RH
Supply
1
2 V
a
c
50/60Hz
or
(
-
5
…
+10%
)
12..15 Vdc
Power consumption
Max. 3VA
Readout
3
-
digit
7
-
segments
LED display
Sensor
RH
-
Sensor
3
-
wire
[+12V
dc
, Signal
0
-
1Vdc
, 0V(GND) common)
Analog output
PI
-
output
0
-
10Vdc
**, Rload min. 10KOhm
Rela
y
s
Ry1 = SPST (NO)
250V/8A cos
n
=1 of
250V/5A cos
n
=0.4
Ry2 = SPST (NO) 250V/8A cosn=1 of 250V/5A cosn=0.4
Ry3 = SPDT (NO/NC) 250V/8A cosn=1 of 250V/5A cosn=0.4
Relays have one common (C)
Communicati
on
RS
-
485 Netw
o
rk
Twisted
-
pair
shielded
only at ALFANET A, B, 0V (A and B twisted)
Control
Thru
four
pushbuttons
at
front
Front
Polycarbonat
e
Dimensions
35
x
77
x
71,5
mm
(
H x
W
x D
)
Panel
cut out
28
x
70
mm
(
H x
W
)
front mounting
**) Maximum voltage of the Analog output is power supply - 3 volts.
- Provided with memory protection during power failure.
- Connection with screw terminals.
- Equipped with senor failure detection.
- Special versions are on request available.
10 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) 79 PI changes back to its the normal operation
mode.

ALFA(NET) 79 PI 0/100%RH Document no.: 170986 version 1.0
Pagina 4 van 8
10.1 Parameters ALFA(NET) 79 PI
Para
-
meter
Description Parameter
Range
Default
value
01
Functi
on
Rela
y
1
1 =
Humidify
2 = Dehumidify
3 = Alarm
1..3
1
02
Functi
on
Rela
y
2
same
as P01
1..3
2
03
Functi
on
Rela
y
3
same
as P01
1..3
3
04
Function PI
-
output
1 =
Humidify
2 = Dehumidify
1..2
1
0
5
Offset
RH
-
s
e
nso
r
(Calibration)
-
15 .. +15
%RH
0
06
Offset PI
(zone)
-
15 .. +15 %RH
0
07
P
-
band setting
1 .. 100 %RH
50
08
I
-
time setting
( 0 = Not
active)
0 .. 99 Minutes
0(off)
1
0
S
wit
ch
ing
differenti
al
rela
y
1
1 .. 15
%RH
1
1
1
S
wit
ch
ing
offset rela
y
1
-
15 .. +15
%RH
0
1
2
S
wit
ch
ing
differenti
al
rela
y
2
1 .. 15
%RH
1
1
3
S
wit
ch
ing
offset rela
y
2
-
15 .. +15
%RH
0
1
4
S
wit
ch
ing
differenti
al
rela
y
3
1 .. 15
%RH
1
1
5
S
wit
ch
ing
offset rela
y
3
-
15 .. +15
%RH
0
2
0
Minimum
adjustable
setpoint
0 ..
1
0
0
%RH
0
2
1
Maximum
adjustable
setpoint
0 ..
100 %RH
100
30
Alarm type
0 =
None
1 = Absolute
2 = Relative
0 .. 2
1
31
Minimum alarm setpoint
0 ..
100
%RH
0
32
Maximum alarm setpoint
0 ..
100 %RH
1
00
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
Control
-
delay
a
fter
power failure
0 .. 99 Minute
s
0
41
F
orced rela
y
functi
on
at
sensor failure
0 = None
1 = Humidify
2 = Dehumidify
0 .. 2
0
90
Netw
o
rk
num
b
er
(
Only at
ALFANET)
1..250
1
95
Software versi
on
-
-
96
Producti
on
ye
ar
-
-
97
Producti
on
week
-
-
98
Seri
al
num
b
er (x1000)
-
-
99
Seri
al
num
b
er (
units
)
-
-

ALFA(NET) 79 PI 0/100%RH Document no.: 170986 version 1.0
Pagina 5 van 8
11 Function diagram

ALFA(NET) 79 PI 0/100%RH Document no.: 170986 version 1.0
Pagina 6 van 8
12 Connections

ALFA(NET) 79 PI 0/100%RH Document no.: 170986 version 1.0
Pagina 7 van 8
13 Dimensions

ALFA(NET) 79 PI 0/100%RH Document no.: 170986 version 1.0
Pagina 8 van 8
14 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