DeZurik P42 Instruksi - Halaman 10
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Troubleshooting
Condition
Signal change has no effect on
actuator position
A slight change in input signal
fully actuates valve
Inaccurate positioning
Overshoot or hunting during
positioning
D10112
Possible Cause
No supply air pressure.
Signal wires connected wrong.
Broken wire between positioner
terminal block and printed circuit
board.
Piping between positioner and
actuator is wrong.
Wrong portion of cam being
used.
Piping between positioner and
actuator is wrong.
Valve body dirty.
Restrictor or nozzle dirty.
Magnet gap has iron dust.
Supply pressure too low.
Torque needed to turn valve has
increased.
Gain setting wrong.
Capacity of supply piping too
low, or air filter is plugged.
Page 10
Corrective Action
Check for correct air supply.
Check markings on terminal
block.
Check continuity of wiring, and
check for tight connections.
See Assembly Drawing for
correct piping.
See Figure 3.
See Assembly Drawing for
correct piping.
See "Maintenance" section.
See "Maintenance" section
Clean gap.
Check for correct air supply.
Look for valve obstructions or
fouling.
See "Adjustments" section.
Check for correct air supply and
clean the filter.
August 2012