Electro-Pneumatic Positioner SP 520 Series
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Ver 1.20
44
SHIN HWA Eng.Co.,Ltd.
CAUTION
▶
In order that actuator shall be operated normally the ZERO and SPAN adjustments
must be set correctly.
▶
If the ZERO and SPAN control is not set correctly, normal performance such as linearity
may have an effect on.
6-2 Limit Switch Adjustment
To adjust the operating position of the limit switch, loosen the cam fixing screw and adjust the cam
position. After rotating it to the position, tighten the screw again to fix it.
6-3 AUTO/MANUAL conversion screw setting method
- The auto/manual switching screw is located on the upper part of the pilot valve and serves
to bypass the positioner.
- If you loosen the lock screw on the upper part of the pilot valve and turn the auto/manual
switch screw in the “M” direction (counterclockwise), the supply pressure supplied to the
positioner enters the actuator as it is regardless of the input signal.
- Conversely, if
the auto/manual switch screw is turned in the “A” direction (clockwise), the
supply pressure supplied to the positioner enters the actuator according to the input signal.
- Before loosening the auto/manual conversion screw, the supply pressure supplied to the
positioner must not be excessive.
Fig 6-2 : Mechanical type limit switch operation position control
