31
Electro-Pneumatic Positioner
TS600 Series
tissin
7
Troubleshooting
7.1
Common problems
Failure
The valve is fully open regardless of the input signal
Causes
The hole of A / M switch of pilot valve is blocked by foreign matter
such as dust
Corrective Action
As shown below, loosen the stopper screw and separate A / M switch
and clean the bottom of the hole with 0.2mm drill or wire and re-fitted
as original.
CAUTION
The sensitivity adjustment screw is set optimally at the factory, do not adjust at random.
7.2
Install Orifice
Failure
When mounted on small size actuator (capacity less than 180cm
3
)
occurs hunting.
Causes
The pneumatic output of the positioner is too large compared to the
actuator chamber size.
Corrective Action
As shown below, remove the O-Ring at OUT1 and OUT2 on the
bottom of the pilot valve, please attach the bottom of the orifice
included in the package.
< A/M Switch Structure>
<Example of orifice installation>
