HT 400 Series, User Manual

Page: 33 / 88

400 Series
EN - 31
6.4.4. mode
The standard defines the tripping times for RCDs at nominal current. The mode is used
to detect the tripping time at tripping current (which could also be lower than the nominal
voltage).
As an alternative:
5.
Press the
GO/STOP
key on the instrument or the
START
key on
remote probe once. The instrument will start measuring with a
“0°” type current, injecting a current in phase with the positive
half-wave of voltage.
Or:
5.
Press the GO/STOP key on the instrument twice or the START key
on the remote probe before the hyphens disappear. The instrument
will start measuring with a “180°” type current, injecting a current in
phase with the negative half-wave of voltage
CAUTION
If message “
Measuring…
” appears on the display, the instrument is
performing measurement. During this whole stage, do not disconnect the
test leads of the instrument from the mains.
6. According to standard EN61008, the test for selective RCDs requires an interval of 60
seconds between the tests.
The mode is therefore unavailable for selective RCDs,
both of A and of AC type
.
7. While performing the test,
the instrument supplies an
increasing leakage voltage
and displays a screen similar
to the one reported here to
the side
R C D
0°
18mA
> 3 0 0 m s
FRQ=50.0Hz Ut=1.4V
VP-N=228V VP-Pe=228V
0° or 180° type current
Test current
the RCD under test did not trip at the
displayed test current
Measuring...
30mA 50V
Func IdN RCD UL
8. When the RCD trips and
separates the circuit, if the
tripping time and current is
within the limits reported in
Table 5, the instrument gives
a double acoustic signal
which signals the positive
result of the test and then
displays a screen similar to
the one reported here to the
side
R C D
0°
27mA
2 7 m s
FRQ=50.0Hz Ut=1.4V
VP-N=228V VP-Pe=228V
0° or 180° type current
Tripping current of the RCD
Tripping time at the tripping current
of the RCD under test
RCD OK
30mA 50V
Func IdN RCD UL
9.
The results displayed can be saved by pressing the
SAVE
key twice or the
SAVE
key and, subsequently, the
ENTER
key (§ 8.1)