Electro-Pneumatic Positioners YT-1000L Series
- 15 -
Adjustment
Adjustment - Zero Point
①
Set supply signal at 4mA or 20mA and rotate adjuster
clockwise or counter-clockwise to adjust actuator's initial
point. When setting initial point, the specification of valve
and system must be taken account. Please refer to
<Figure 17> for increase/decrease of the zero point.
<Figure 17>
②
When single acting actuator with spring is used, please check if the pressure level
which is indicated on the positioner is same to the supplied pressure level.
Adjustment - Span
①
After setting zero, supply 20mA or 4mA of signal.
Check the actuator's stroke. If the stroke is too low,
adjust the span towards '+' direction. On the other
hand, if the stoke point is too high, adjust the span
towards '-' direction. <Figure 18>
②
Changing span point affects zero point setting. So zero
setting must be set again. After setting zero point,
confirm the span point. This step must be repeated
<Figure 18>
until both points are properly set.
③
After setting is completed, tighten Lock Screw. <Figure 18>
Adjustment - A/M Switch (Auto/Manual)
①
A/M switch adjusts the valve operation to
automatic or manual.
②
When produced, YT-1000L is set at
"A(Automatic)". If user prefers the positioner's
setting as "M(Manual)," the setting can be
changed by turning the switch counter-clockwise.
<Figure 19>
③
If it is set as "M(Manual)", the air pressure will be
supplied to the actuator directly. Always set back
to "A(Automatic)" after setting change.
④
If OUT2 in single acting actuator or double acting
actuator is used, A/M Switch will not operate.
<Figure 19>
Adjustment - Seat Adjuster
①
Seat Adjuster is set according to the customer's request before the positioner is
delivered. Please do not adjust the Seat Adjuster.