MPI-506 – USER MANUAL
During the touch voltage or
earth resistance measure-
ment, the RCD trips (RCD
trips at only 40% of the I
n
set).
Relatively high leakage cur-
rents in the installation.
Reduce the leakage currents.
Defects in the installation.
Verify the correctness of N and PE
connections.
The RCD does not trip during
the tripping test.
Incorrectly set current wave-
form.
Set correct current waveform.
test the RCD with the TEST button;
replace if necessary.
Defects in the installation.
Verify the correctness of N and PE
connections.
During the tripping current
measurement, the
sym-
bol is displayed even if the
RCD has tripped.
The RCD tripping time is
longer than the measurement
time.
RCD should be considered defec-
tive.
Large differences between
repeated measurements of
the RCD tripping time.
Pre-magnetization of the
transformer core inside the
RCD.
Normal for some direct action resid-
ual current devices. Try to make
next measurements at reversed po-
larity of the residual current.
Measurement of t
A
or I
A
is
impossible.
Touch voltage generated dur-
ing the t
A
or I
A
, measurement
may exceed the safe voltage
level – the measurement is
automatically blocked.
Check connections in the protective
conductor.
Verify correct RCD selection in
terms of rated residual current.
Unstable U
B
or R
E
measure-
ment results, i.e. successive
results in the same meas-
urement point are significant-
ly different.
Significant leakage currents,
highly variable.
The
symbol
is not dis-
played even if the voltage be-
tween the contact electrode
and the PE conductor ex-
ceeds the detector tripping
threshold (about 50 V).
Contact electrode does not
function well or the meter’s
input circuits are damaged.
Sent the meter for repair. Use of de-
fective meter is not permitted.
Rotary switch is not set cor-
rectly.
Contact electrode is active for the
measurements of earth loop param-
eters and RCD, with the exception of
the Z
L-N,L-L
U
L-N,L-L
function.
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