10.TROUBLE SHOOTING
Impact
1. Foreign matter got caught in the pressure switch.
1. Remove the foreign matter from inside
the piping, and then replace the pressure
switch with a new one.
1-2. Decrease the response speed of
PLC.
1. Improve so that impact will not be
applied, and then replace the pressure
switch with a new one.
2-1. To protect against organic solvents,
install the cover and replace the pressure
switch.
2-2. Replace with a conforming pressure
switch.
1. Check the supply pressure or increase
the set pressure.
3. Replace the pressure switch and use a
contact protection box.
4. Replace the pressure switch every 5
million operating cycles as a guideline.
5. Replace the pressure switch and use a
contact protection box.
1. If it is impossible to keep distance from
the strong magnetic field source, provide
a shield plate between the pressure
switch and the source.
1-1. Decrease the impact or use a solid
state auto switch.
5. The contact protection box has not been used. The
operating conditions require it to be used.
4. The number of operation cycles has exceeded 5
million cycles.
3. A large inrush current has flowed through the switch.
2. Overcurrent was applied to the switch
1. The load conditions are outside of the specification.
-18-
Failure
Possible cause
Countermeasure
Switch does
not turn off.
Fused contact of the
switch
1. and 2. Review the control circuit and
replace the pressure switch.
External magnetic
field keeping the
switch on.
Air leaks.
1. Pressure is applied to the pressure switch.
2. The switch is operated in an environment exposed to
organic solvent.
1. Excessive impact has been applied to the switch.
1. Excessive impact has been applied to the pressure
switch.
1. There is a strong magnetic field source around the
pressure switch.
Pressure supplied
Broken switch