7. ADJUSTMENT PROCEDURE
1) Zero Adjustment
• Set an signal to the Stroke starting
signal(0.2kgt/_) then turn the Zero
Adjuster clockwise or counter-clock-
wise.
• In case of Spring Actuator, check if it
is set to standard pressure in Zero
Point. If not, repeat Zero adjustment.
2) Span Adjustment
• Turn and adjust Span Adjustment
Screw so that Indicator reaches at
final Stroke Point by final input signal.
• Check Zero Point and repeat Zero
Span Adjustment. 1/2 Split Range can
be used by Zero and Span Adjust-
ment.
After setting, tighten up Lock Screw
of Span adjustment.
3) Auto/Manual Switch
• This is a Switch for changing Auto
and Manual.
• Shipped products is set for Auto. To
use Manual operation, turns A/M
Switch
counterclockwise.
• In manual operation, the pressure of
YT-200 air filter regulator connects to
Actuator. After using, return switch to
“A”.
• Not available for Single Acting-
OUT2 and Double Acting.
4) Seat Adjuster
• No need to adjust at the field
because Seat Adjuster is to be
adjusted before shipment for bal-
anced pressure point of output
pressure.
• Seat Adjuster is always used for
Double-acting. If need to change
balanced pressure point of output
9. MAINTENANCE AND CHECK
• If the supply air is fouled, the
positioner may not operate normally.
Periodically check the compressed air
cleaning system and make sure that
clean air is always supplied.
• When you disassemble the pilot
valve, coat grease to the O-ring of the
sliding section.
• When the fixed orifice is clogged
with carbon particles or others,
remove the pilot valve Auto/Manual
changeover screw(built-in fixed
aperture) and clean it by inserting a
Ø0.2 wire into the aperture. If it must
be replaced with new one, stop the
supply pressure and remove the
stopper screw of the pilot valve.
• Check the positioner once a year.
When you find excessively worn
diaphragm, O-ring and other packing
or any unit, it should be changed with
new one. Treatment at an early stage
is especially import if the positioner is
used in a place of severe environ-
ment like coastal area.
10. WARNING
• Do not apply large vibration or
impact to the positioner. It causes
trouble. The positioner must be
handled very carefully during transpor-
tation and operation.
• If the positioner is used under
temperature outside of the specifica-
tion, the sealing materials deteriorate
quickly and also the positioner may
not operate normally.
• Use clean supply air fully removed
humidity and dust.
• If you leave the positioner at the
operation site for a long time without
using it, put the cover on it so that the
rain water does not enter the
positioner.
If the atmosphere is of high tem-
perature or high humidity, take mea-
sures to avoid condensation inside.
The condensation control measures
must be taken thoroughly for export
shipment.
