M-system VOS2T User manual

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4767 Rev.2 P. 1 / 4
INSTRUCTION MANUAL
BEFORE USE ....
Thank you for choosing M-System. Before use, please check
contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact M-System’s Sales Office or representatives.
■PACKAGE INCLUDES:
VOS2T unit..........................................................................(1)
Cable, approx. 1 meter long (optional) ...............................(1)
Cable connector (optional) ..................................................(1)
Lever assembly
Lever ........................................................................(1)
Connecting pin ........................................................(1)
Nailed nut................................................................(1)
Nut with washer (M5).............................................(1)
Screws for attaching the lever (M5 × 8).............................(1)
Plain washer (M5)...............................................................(1)
Toothed washer (M5, external teeth) .................................(1)
Note: Bracket and other components necessary to attach the
VOS2T to an actuator are to be provided by the cus-
tomer.
Clamp Set (model: VOCP) is available to simplify the
connection.
■MODEL NO.
Confirm Model No. marking on the product to be exactly
what you ordered.
POINTS OF CAUTION
■CONFORMITY WITH EU DIRECTIVES
• When the unit is mounted onto a grounded metal bracket,
insert a noise filter for the output. COSEL Noise Filter
Model NAC-04-472 or equivalent is recommended.
■GENERAL PRECAUTION
• Cut power supply to the unit before wiring to it.
■ENVIRONMENT
• Inside building. If outside, keep away from direct sun-
light.
• Operating temperature -5 to +60°C (23 to 140°F)
• Operating humidity 30 to 90% RH
■DESIGN OF MOUNTING BRACKET
• The size ‘x’ indicated in Figure 2 must be longer than 10%
of full-stroke of the actuator when it is in the middle po-
sition.
• The VOS2T unit must be positioned in parallel or in ver-
tical to the actuator stroke.
■ACTUATOR SIDE LEVER
• When the actuator side lever is provided by the customer,
be sure that width of the hole threading the connecting
pin is 5 millimeters or wider. Diameter of connecting pin:
50
–0.03 mm
■GASKET
• Be sure to return the gasket when you close the unit cover
after wiring or adjustments.
■TORQUE
• For the screws attached to the cover, tightening torque is
between 1.2 and 1.6 N·m.
2-WIRE POSITION TRANSMITTER
(linear motion type; 45-degree rotation) MODEL VOS2T

VOS2T
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4767 Rev.2 P. 2 / 4
COMPONENT IDENTIFICATION
Jumpers (JP1, JP2)
Cover
Body
Specifications
REVERSEDIRECT
JP1
JP2
RD
JP1
JP2
RD
Screw for Lever
Plain Washer
External Toothed Washer
Lever
Shaft
Indicator
Zero Adjustment (Z)
Span Adjustment (S)
Output Terminal (+)
Output Terminal (–)
Cable Connector
Cable
■ Upper side ■ Lower side
Figure 1
INSTALLATION
The output accuracy of the VOS2T is largely affected by its
mechanical position relative to the actuator. The VOS2T
should be installed according to the following instructions
because an improper installation may lower its perfor-
mance. No unnecessary strain should be applied to the
VOS2T unit or the lever.
■ATTACHING THE CONNECTING PIN TO THE VOS2T SIDE LEVER
Attach the connecting pin to the VOS2T side lever utilizing
the nailed nut and the nut as in Figure 2. The nail could be
positioned in either side of the lever, however it is limited to
one side at the extreme end of the lever hole.
As you see in Figure 3, the output signal of the VOS2T is
proportional to the sine q of the lever angle. Position of the
connecting pin is determined by the following equation.
R = 2.613 × S
2
where
R = Distance between the centers of pin and lever (radius)
S = Actuator stroke
Note: It is recommended to set the connecting pin at this
stage to the position a little nearer to the actuator
than the calculated position in order to prevent over-
range rotation of the VOS2T side lever. Move it back
to the correct position later in the adjustment proce-
dure.
Nut with Washer
Lever, VOS2T Side
Nailed Nut
Connecting Pin
Lever, Actuator Side
ø5 –0.03
0
x
Figure 2
Lever, Actuator Side
(Clamp Set)
Lever, VOS2T Side
R
h
q
Connecting Pin
(Attached to the Lever Assembly)
Figure 3

VOS2T
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4767 Rev.2 P. 3 / 4
■CONNECTING THE VOS2T SIDE LEVER
Connect the lever to the VOS2T unit with a screw included
in the package, with a plain washer and a toothed washer
between them as in Figure 1.
Lever direction can be changed by 90 degrees.
■CONNECTING THE VOS2T UNIT TO THE ACTUATOR
Set the VOS2T unit to the position where the VOS2T output
is approximately 12mA with 50% actuator position (θ= 0°
in Figure 3), and where the VOS2T side lever and the actua-
tor side lever are positioned in a straight line. See Figure 4
below. The actuator side lever should be threaded with the
connecting pin but left loose. Do not fix the connecting pin
to the actuator side lever.
Diaphragm Actuator
Actuator Stem
Bracket
VOS2T
Lever, VOS2T Side
Lever, Acutator Side
(Clamp Set)
Figure 4
ELECTRICAL CONNECTIONS
Remove the VOS2T unit cover (or the terminal box cover
with limit switch box option) and wire to the terminals ac-
cording to Figure 5.
15 – 28V DC
LOAD
–
+
OUTPUT
4 – 20mA DC
Figure 5
ADJUSTMENT PROCEDURE
Open the VOS2T 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 ZERO AND SPAN
1) If you need reverse action, change the setting now. Re-
move 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 ac-
cording to the following.
2) First operate the actuator
slowly for full-stroke and
check that the VOS2T out-
puts approximately 0 – 100%
(4 – 20mA DC) accordingly.
Be sure also that the output
signal increases or decreases
without interruption.
3) With 50% input (actuator
position), check that the out-
put is approximately 50%.
See Figure 6.
4) With 0% input, adjust the
output to 0% with Zero ad-
justment. See Figure 7.
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 8.
6) With 100% input, adjust the
other half of the deviation
with Span adjustment in or-
der to get 100% output. See
Figure 9.
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 does not output above or below the full-
scale range.
OUTPUT %
100
500 100
INPUT %
0
Fig. 6
OUTPUT %
100
500 100
INPUT %
0
Fig. 7
deviation
OUTPUT %
100
500 100
INPUT %
0
Fig. 8
1/2 deviation
OUTPUT %
100
500 100
INPUT %
0
Fig. 9
1/2 deviation

VOS2T
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4767 Rev.2 P. 4 / 4
MAINTENANCE
■MECHANICAL PARTS
• Check that screws are fastened tightly and if some of
them are loosened, be sure to re-tighten them.
If you find the connecting pin loose, go through “ADJUST-
MENT PROCEDURE” again.
• Inspect visually that the connecting section of levers is
stable and smooth. Check also that the connecting pin
or lever is not worn. If it is, it must be replaced. Consult
M-System or local representative. If the abrasion advanc-
es fairly quickly, there may be a problem in the link mech-
anism (e.g. connecting pin position)
• If the VOS2T is installed outside the building or where it
is subject to water or metallic dust particles, check that
there is no crack or bruise on the gasket. If you find any,
consult M-System or local representative.
• Consult M-System or local representative also for inspec-
tion of packing (O-ring) in the moving parts.
■ELECTRICAL PARTS
• Check first the mechanical parts as above.
• Change actuator positions and input 0%, 25%, 50%, 75%
and 100% signals. Check the output with respective input
value is within allowance indicated in the specifications.
If not, go through “ADJUSTMENT PROCEDURE” again.
LIGHTNING SURGE PROTECTION
M-System offers a series of lightning surge protectors for
protection against induced lightning surges. Please contact
M-System to choose appropriate models.