Siko SG5 Benutzerinformation Seite 8

Alignment
1. Move axis to start position.
2. Turn potentiometer (Po) until start value (4mA)
is measured.
3. Move axis to end position.
4. Turn potentiometer (Pe) until end value (20mA)
is measured.
The steps 1 to 4 are to be repeated until the va-
lues are counterbalanced.
Current
20mA
4mA
0
Fig. 9: Aligment
5.3 Alignment of the R/U transformer (MWU)
If the device is equipped with a resistance-volta-
ge converter, then the potentiometer resistance is
converted into a voltage of 0 to 10VDC. Connec-
tion is via three-wire technology.
Ex works, the instrument transformer is aligned
to the initial value of 0V output voltage (Po), at
an extension length of 0mm and a final value of
10V output voltage (Pe), at a maximum extension
length of the encoder. The output of the instru-
ment transformer should be wired against GND
with a resistor 2 to 10KΩ to enable the initial
value of 0V to be set. However, the output load
should be dimensioned so that an output current
of 10mA won't be exceeded in the end position
(10V). By means of the trimming potentiometer
Pe (see fig. 10), the final value can be adjusted
to the actual final position of the application.
Setting the instrument transformer
After releasing the hood snap, the trimming po-
tentiometer Pe can be accessed. Since it is SMD
designed, it should be set up cautiously. An out-
put voltage of 10V with an extension position of
60 to 100% of the maximum encoder extension
length can be set.
Alignment
1. Move axis to final position
8 SG5
2.
Fig. 10: Setting the trimming potentiometers
5.4 What to do if... (Instrument transformer)
(Pe)
... if the instrument transformer's start / end
value cannot be set to 4 / 20 mA?
•
(Po)
... an undefined value is displayed?
•
Distance
6. Starting
Please ensure that the instructions given in chap-
ter 4 and 5 regarding mechanical and electrical
connection are followed. This will ensure correct
installation and the operating reliability of the
device.
Before starting check again:
•
•
•
SIKO GmbH
Werk / Factory:
Weihermattenweg 2
79256 Buchenbach-Unteribental
Postanschrift / Postal address:
Postfach 1106
79195 Kirchzarten
Telefon/Phone
Telefax/Fax
E-Mail
Internet
Service
Datum 25.08.2010
Turn potentiometer (Pe) until an output voltage
of (10V) is measured.
the potentiometer's setting range is perhaps
to small.
Carry out re-alignment or precise alignment. Un-
defined values can be caused by cable breaks.
correct polarity of the supply voltage
correct cable connection
correct mounting of the device
+49 7661 394-0
+49 7661 394-388
info@siko.de
www.siko.de
support@siko.de
Art.Nr. 83679 Änd. Stand 281/10