WIKA iWU-20 Betriebsanleitung Seite 34

10. Trouble shooting
Failure
Output signal unchanged after
change in pressure
No output signal
No/False output signal
Abnormal output signal or
Abnormal zero point signal
Abnormal zero point signal
Signal span dropping off/too
small
Signal span too small
*) Make sure that after the setting the unit is working properly. In case the error continues to exist send in the instrument for reparation (or replace the unit).
In case of unjustified reclamation we charge the reclamation handling expenses.
34
Possible cause
Mechanical overload through
overpressure
Wrong supply voltage or current
spike
No/incorrect voltage supply or
current spike
Cable break
Incorrectly wired (e.g. Connected as
2-wire instead of 3-wire system)
Zero point set wrongly
Medium or ambient temperature too
high/ too low
Diaphragm is damaged, e.g. through
impact, abrasive/aggressive media;
corrosion of diaphragm/pressure
connector.
Diaphragm is damaged, e.g. through
impact, abrasive/aggressive media;
corrosion of diaphragm/pressure
connector.
Power supply too high/too low
Mechanical overload through
overpressure
WIKA Operating instructions iWU-2x
Procedure
Replace instrument; if failure
reoccurs, consult the manufacturer
*)
Replace instrument
Adjust the voltage supply to
correspond with the Operating
Instructions *)
Check connections and cable
Follow pin assignment (see
Instrument Label / Operating
Instructions)
Adjust zero point correctly (see
chapter 8); a sufficiently accurate
current/volt meter should be used
Control the internal temperature of
the instrument within the
permissible range; observe the
allowable temperature error (see
Operating Instructions)
Replace instrument
Contact the manufacturer and
replace the instrument
Correct the power supply in line with
the Operating Instructions
Re-calibrate the instrument *)
EN