14208834.01 07/2017 EN/DE/FR/ES
22 WIKA operating instructions pressure switch, model PSD-4
EN
In the event of any faults, rst check whether the pressure switch is mounted correctly, mechanically and electrically.
If complaint is unjustied, the handling costs will be charged.
Fault 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 or switching of switching logic/
analogue signal
Observe the pin assignment
Check the output conguration
Constant output signal upon change in
pressure
Mechanical overload caused by overpres-
sure
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 overpres-
sure
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 Moisture has entered Fit 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
Warnings and errors
Via the digital indicator, the instrument's internal warnings and errors are output. The instrument continues to measure,
even when a warning exists. The output signal and the switching outputs are still output.
The following table shows the codes and their meaning.
Warning Description
ATT1 On changing the switch point, the reset point of the instrument is automatically reduced to the smallest hysteresis
of 0.25 %.
ATT2 Zero point adjustment error, current pressure is outside the limits
ATT3 Password entered for menu access is incorrect
ATT4 Unit cannot be displayed on digital indicator, previous unit is used
6. Faults
MAKGIL VIET NAM
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