Adjustment And Alignment - Siko SG10 Benutzerinformation

Connection instrument transformer (MWI) load
against +UB:
4.3 Potentiometer with R/U transformer (MWU)
The instrument transformer provides an output
voltage of 0 to 10VDC.
Color
brown
white
green
4.4 Incremental encoder
For the version with incremental encoder take the
data from the attached supplementary user infor-
mation.

5. Adjustment and Alignment

5.1 Potentiometer setting
When correctly connected and switched on, the
unit displays the current actual value.
The measuring range of the potentiometer is mat-
ched to the total pull-out length of the wire. Ex
works value 0 Ohm is preset for pull-out length
0mm (wire completely pulled in).
5.2 Alignment of the R/I transformer (MWI)
If the device is equipped with a resistance-current
converter, then the potentiometer resistance is
converted into a current of 4 to 20mA. The measu-
ring current is also used for feeding the instru-
ment transformer.
Ex works, the instrument transformer is aligned to
default values: 4mA for the start position (Po),
corresponding to the pull-out length of 0 mm
(completely pulled in), and 20mA for the end po-
sition (Pe), corresponding to the max. mm pull-
out length (completely pulled out) of the poten-
tiometer. Via two trimmpotentiometer's Po and Pe
(see fig. 5) these values can be adjusted to the
application's actual start and end position.
Setting the instrument transformer
When the screws are removed (1) and the cover
opened (2), the trimming potentiometers can be
accessed.
SG10 Datum 22.07.2009
follower electronics
Designation
+24VDC
GND
Uout
Measuring range < 1000
Fig. 5: Setting the trimming potentiometers
• Trimmpotentiometer's Po is used to adjust a
current of 4mA to potentiometer values of 0 to
15% of the total range.
• Trimmpotentiometer's Pe is used to adjust a
current of 20mA to potentiometer values of 90
to 100% of the total range.
The smallest available potentiometer range, in
which 4 to 20mA are delivered, is hence 15% to
90% of the potentiometer's resistance range.
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. 6: Aligment
Art.Nr. 80805
Attention! Do not open spring
casing (with SIKO Logo) - risk
of injury.
(Pe)
(Po)
Distance
Änd. Stand 220/09 9