Trouble Shooting - JUMO 4AP-30 Notice De Mise En Service

5 Trouble shooting

Type of fault
No output signal
Output signal stays con-
stant, even though the
pressure changes
Output signal too high
Output signal too low
Zero of the output signal is
wrong
Output signal characteris-
tic is not linear
Possible cause
No supply voltage
Cable break, incorrect connection
No input pressure
Fault in pressure transmitter, caused
by impermissible operating conditions
Measurement system of the instrument
has been destroyed by excessive pres-
sure
Output signal from the pressure trans-
mitter is being distorted by the current
limiting, resulting from overvoltage
Measurement point is blocked
Selected measurement range is too
low
The electronics of the pressure trans-
mitter is faulty, or the supply voltage is
too high
With current output signal: burden is
too high
With voltage output signal: burden is
too low
Supply voltage is too low
Pressure transmitter measurement has
shifted because of impermissible oper-
ating conditions (e.g. overpressure)
Handling
Check supply voltage
Check connecting cables
Check connection to the pressure
medium
Return the pressure transmitter to the
supplier, with a detailed description of
the fault
Provide the correct supply voltage
Measurement range is too small
– return the pressure transmitter to the
supplier, with a detailed description of
the fault
Check measurement point, if neces-
sary clean or replace it
Return the pressure transmitter to the
supplier, with a detailed description of
the fault
Change the burden on the measure-
ment circuit
Alter the supply voltage
Return the pressure transmitter to the
supplier, with a detailed description of
the fault
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