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6. Faults
6. Faults
CAUTION!
Physical injuries and damage to property and the environment
EN
If faults cannot be eliminated by means of the listed measures, the pressure switch must be taken out
of operation immediately.
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For contact details, see chapter 1 "General information" or the back page of the operating instructions.
In the event of any faults, first check whether the pressure switch is mounted correctly, mechanically and electrically.
Fault
No output signal
No output signal
No/wrong output signal
Constant output signal upon change
in pressure
Deviating zero point signal
Signal span too small
Signal span too small
Signal span drops
Signal span drops/too small
14
Ensure that pressure or signal is no longer present and protect against accidental commissioning.
Contact the manufacturer.
If a return is needed, please follow the instructions given in chapter 8.2 "Return".
Possible cause
Cable break
No/wrong supply voltage
Wiring error or switching of switching logic/
analogue signal
Mechanical overload caused by
overpressure
Overpressure limit exceeded
Mechanical overload caused by
overpressure
Supply voltage too high/low
Moisture has entered
Diaphragm damaged, e.g. due to impacts,
abrasive/aggressive medium; corrosion at
diaphragm/process connection
Measure
Check the continuity
Rectify the supply voltage
Observe the pin assignment
Check the output configuration
Replace instrument; if it fails repeatedly,
contact the manufacturer
Maintain permissible overpressure limit
Replace instrument; if it fails repeatedly,
contact the manufacturer
Rectify the supply voltage
Mount the cable correctly
Contact manufacturer and replace instrument
WIKA operating instructions pressure switch, model PSD-4
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