WIKA PSD-30 - Page 30

30 WIKA operating instructions pressure switch, model PSD-3x
EN
11430486.07 04/2015 EN/DE/FR/ES
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 over-
pressure
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 over-
pressure
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 unjustied, we will charge you the complaint processing fees.
CAUTION!
If deciencies cannot be eliminated by means of the measures listed above, shut down the
instrument immediately, and ensure that pressure and/or signal are no longer present, and
secure the instrument from being put back into operation inadvertently. In this case, contact
the manufacturer. If a return is needed, follow the instructions given in chapter 9.2 "Return".
8. Faults