VOS2T-R
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-4766 Rev.6 P. 3 / 4
ELECTRICAL CONNECTIONS
Remove the VOS2T-R unit cover and wire to the terminals
according to Figure 6.
15 – 28V DC
LOAD
–
+
OUTPUT
4 – 20mA DC
Figure 6
ADJUSTMENT PROCEDURE
First adjust the relative positions of levers and linking
mechanism.
After that, open the VOS2T-R unit cover. Set the action
direction* with jumpers (JP1, JP2 in Figure 1) and adjust
Zero (Z) and Span (S) behind it.
* Direct action: the output increases when the shaft turns
clockwise (seen from the lever side).
Reverse action: the output increases when the shaft turns
counterclockwise (seen from the lever side).
■
HOW TO ADJUST LEVERS & LINKING MECHANISM
1) Electrical wires to the terminals should be done
before this adjustment. However, do not change each
potentiometer’s setting yet. Leave the jumper settings
for action direction as they were set at the factory (direct)
at this moment.
2) For using levers to link, loosen the VOS2T-R side nut
and washer and set the connecting pin (or bolt) position
relative to other components so that the distance A – B
and C – D is the same. See Figure 2. Tighten the nut and
washer.
3) For using the VOLK in combination with the VOS2T-R
lever, adjust lever length of the VOLK so that the distance
A – C and B – D is also the same. (The square A-B-C-D
must be a parallelogram or a rectangle.) Then tighten
the bolt.
If a customer provided lever is also adjustable of its
length, do the same.
4) With the actuator positioned at 50%, adjust the VOS2T-R
shaft angle with a wrench (7 mm) or by twisting the
indicator with your hand so that the VOS2T-R outputs
approx. 12mA. If you are using levers to link, tighten the
screw for lever now (torque 2.4 – 3.1 N·m). If you are not
using a lever, fix the coupling now.
5) Check the indicator and adjust its angle after loosening
its screw (M2.6) if necessary. Make sure that it is
tightened again after adjustment.
■
HOW TO ADJUST ZERO AND SPAN
1) If you need reverse action, change the setting now.
Remove the cover and set the jumpers JP1 and JP2 to
R position according to Figure 1. Factory set zero point
may be slided by changing the action direction. Re-adjust
according to the following.
2) First operate the actuator
slowly for full-stroke (90°or
input angle after adjust-
ment) and check that the
VOS2T-R outputs approxi-
mately 0 – 100% (4 – 20mA
DC) accordingly. Be sure
also that the output signal
increases or decreases with-
out interruption.
3) With 50% input (actuator
position), check that the out-
put is approximately 50%.
See Figure 7.
4) With 0% input, adjust the
output to 0% with Zero ad-
justment. See Figure 8.
5) Set the input to 100%. If
there is a deviation in out-
put signal, compensate half
of the deviation via the Zero
adjustment. See Figure 9.
6) With 100% input, adjust the
other half of the deviation
with Span adjustment in or-
der to get 100% output. See
Figure 10.
7) Input 0%, 50% and 100%
signals and check the output
according to the respective
input value. If the output
value is shifted, repeat the
above procedure (3) – (6).
Note: If you set a wider output span (narrower input span),
the VOS2T-R does not output above or below the full-
scale range.
OUTPUT %
100
50
0
100
INPUT %
0
Fig. 7
OUTPUT %
100
50
0
100
INPUT %
0
Fig. 8
deviation
OUTPUT %
100
50
0
100
INPUT %
0
Fig. 9
1/2 deviation
OUTPUT %
100
50
0
100
INPUT %
0
Fig. 10
1/2 deviation
