Electro-Pneumatic Positioner
YT-1000 / 1050 series
Product Manual
Ver. 1.30
74
➢
Linearity is too low.
1)
Check if linear positioner is properly positioned. Especially check if the feedback lever is parallel
to the ground at 50 % point.
2)
Check if zero and span point have been properly adjusted. If either one of values is being adjusted,
another one must be re-adjusted as well.
3)
Check if supply air pressure level is stable from the regulator. If the level is unstable, the regulator
must be replaced.
➢
Hysteresis is too low.
1)
In case of double acting actuator, check if seat adjustment has been properly performed. Please
contact YTC for any further inquiries regarding the seat adjustment.
2)
Backlash can occur when the feedback lever and lever spring are loosen. To avoid backlashing,
please adjust the lever spring.
3)
Check if the connection bar to the feedback lever is tightly fastened.
