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Electro-Pneumatic Positioner SP 520 Series
_________________________________________________________________________________________________________
Ver 1.20
43
SHIN HWA Eng.Co.,Ltd.
5-11 Grounding
- For the safety of the positioner and system, it must be grounded.
- There is 1 ground terminal inside and 1 outside the positioner. M4 round head + bolt is
assembled.
-
Any grounding terminal can be used and the resistance should be less than 100Ω.
6. Adjustment
6-1 SPAN adjustment and ZERO setting method
①
From Calibrator, input 4mA current, rotate ZERO adjustment screw and adjust so that that valve
position may be in 0%.
②
From Calibrator, input 20mA current, rotate ZERO adjustment screw and adjust so that that
valve position may be in 100%.
③
When adjusting by turning the SPAN adjusting screw, the position of 0% adjusted in the above
step
①
changes, so repeat the step
①
once again.
④
When adjusting by turning the SPAN adjusting screw, the position of100% adjusted in the above
step
②
changes, so repeat the step
②
once again.
⑤
If you repeat the steps
①
and
②
above 2~3 times, you can set the correct position of OPEN
and CLOSE.
Fig 6-1 : SPAN Adjustment and ZERO structure