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9. Trouble shooting
9. Trouble shooting
Open pressure connections only after the system is without pressure!
Warning
Take precautions with regard to remaining media in removed pressure
„
!
switches. Remaining media in the pressure port may be hazardous or
toxic!
Warning
Remove the pressure switch from service and mark it to prevent it from
„
being used again accidentally, if it becomes damaged or unsafe for opera-
tion.
Have repairs performed by the manufacturer only.
„
Do not insert any pointed or hard objects into the pressure port for cleaning to prevent
damage to the diaphragm of the pressure connection.
Please verify in advance if pressure is being applied (valves/ ball valve etc. open) and if the
right voltage supply and the right type of wiring (3-wire) has been chosen?
Failure
No output signal
No output signal
No/False output signal
Output signal unchanged after change
in pressure
Abnormal zero point signal
Signal span too small
Signal span too small
22
WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio PSD-30
Possible cause
Cable break
No/incorrect voltage supply
Incorrectly wired
Mechanical overload through over-
pressure
Overload limits exceeded
Mechanical overload through over-
pressure
Power supply too high/too low
Procedure
Check connections and cable
Adjust the voltage supply to correspond
with the Operating Instructions
Follow pin assignment (see Instrument
Label / Operating Instructions)
Replace instrument; if failure reoccurs,
consult the manufacturer
Ensure permissible overload limits are
observed (see Operating Instructions)
Replace instrument; if failure reoccurs,
consult the manufacturer
Correct the power supply in line with
the Operating Instructions
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