WIKA PSA-31 - Manual (Page 29)

29 WIKA operating instructions pressure switch model PSA-31
GB
14018458.01 11/2011 GB/D/F/E
8. Faults
In the event of any faults, first check whether the pressure switch is mounted correctly, mechanically and
electrically.
Error display
Via the instrument's display internal errors are output.
The following table shows the error codes and their meaning.
8. Faults
Problem Possible cause Measure
No output signal Cable break Check the continuity
No output signal No/wrong power supply Rectify the power supply
No/wrong output signal Wiring error Observe the pin assignment
Constant output signal upon change in
pressure
Mechanical overload caused by overpressure Replace instrument; if it fails repeatedly, contact
the manufacturer
Deviating zero point signal Overpressure limit exceeded Observe the permissible overpressure limit
Signal span too small Mechanical overload caused by overpressure Replace instrument; if it fails repeatedly, contact
the manufacturer
Signal span too small Power supply too high/low Rectify the power supply
Signal span drops Humidity has entered Assemble the cable correctly
Signal span drops/too small Diaphragm damaged, e.g. due to impacts,
abrasive/aggressive medium; corrosion at
diaphragm/process connection
Contact manufacturer and replace instrument
If complaint is unjustified, we will charge you the complaint processing fees.
Error Description
ATT1 On changing the switch point, the system automatically reduces the reset point.
ATT2 Zero-point adjustment error, current pressure is outside the limits
ATT3 Password entered for menu access is incorrect
ERR Internal error
OL Overpressure, measuring range exceeded > approx. 5% (display blinks)
UL Underpressure, below measuring range < approx. 5 % (display blinks)
Acknowledgement of an error display by pressing the "Enter" key.