Maintenance And Check - SMC Networks IP8000 Operation Manual

8.Maintenance and Check

(1) After installation, repair or disassembly, connect compressed air and conduct tests
to confirm appropriate function and leakage.
Do not use the positioner when noise from the bleeder sounds louder compared with the
initial state, or when it does not operate normally. If these occur, check immediately if
assembled and mounted correctly.
Never modify electrical construction to maintain explosion-proof construction.
(1) Check if supply air is clean or not. Inspect compressed air cleaning system periodically
and keep condition to be able to always get clean air so that dust, oil and humidity which
cause malfunction and failure wouldn't include into the equipment.
(2) If handled improperly, compressed air can be dangerous. Maintenance and replacement
of unit parts should be performed only by trained and experienced personnel for
instrumentation equipment as well as following the product specifications.
(3) Perform an annual inspection of the positioner.
Zero point and span may have deviated. During regular maintenance, check for the
following and replace any components as necessary.
When an excessively worn O-ring or other packing is found, or any unit (the pilot valve
unit etc.) has been damaged, replace with new ones. Treatment at an early stage is
especially important if the positioner is used in a place of severe environments.
(4) Before removing the positioner for maintenance or replacing unit parts after installation,
make sure the supply pressure is shut off and all residual air pressure is released from
piping.
(5) When the fixed orifice is clogged with carbon particles or others, remove the pilot valve
Auto/Manual changeover screw (built-in restrictor) and clean it by inserting a ø0.2 wire
into the aperture. If it must be replaced with new one, stop the supply pressure and
remove the stopper screw of the pilot valve.
(6) It is recommended to replace the pilot valve unit every 3 years.
(7) Check air leak from piping which compressed air flows. Air leak from air piping could
deteriorate characteristics.
Air is normally discharged from a bleed port, but this is a necessary air consumption
based on the construction of the positioner, and is not an abnormality if the air
consumption is within the specified range.
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Warning
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Caution
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