VR2250
Page 25 of 131
6.3.
RCD: TEST ON "A" AND "AC" RCDS TYPE
The test is executed according to IEC61557-6, EN61008, EN61009, EN60947-2 B 4.2.4
and VDE 0413 part 6.
CAUTION
The automatic check of the RCD features causes the tripping of the RCD itself.
Therefore
check that all devices connected downstream of the RCD under
test are not damaged by power off.
Possibly disconnect all the loads
connected downstream of the RCD as they could add additional leakage
currents to the instrument ones and so making the test results void.
Turn the
switch
to the
RCD
position:
The
F1
key permits to select one of the following measuring modes (which
can be shown cyclically when pressing the key):
Mode "
AUTO
" (the instrument performs the test automatically with a
leakage current equal to half, once and five times the value of the rated
current set). Recommended test.
Mode "
x ½
"
(the instrument performs the test with a leakage current
equal to half the value of the rated current set).
Mode
"
x 1
"
(the instrument performs the test with a leakage current equal
to once the value of the rated current set).
Mode
"
x 2
"
(the instrument performs the test with a leakage current equal
to twice the value of the rated current set).
Mode
"
x 5
"
(the instrument performs the test with a leakage current equal
to five times the value of the rated current)
Mode
" " (the instrument performs the test with a ramp growing leakage
current. Use this test to measure the tripping current).
Mode
"R
A
"
(the instrument performs the test with a leakage current
equal to half the value of the selected rated current and calculates the
contact voltage as well as the R
a
earth resistance).
N.B.
The
AUTO
mode execute automatically test with phase 0° and 180°
RCD Type
0° Current Waveform
180° Current Waveform
AC type
A type
According to standard practice it is recommended to perform the RCD test
both with phase 0° and with phase 180° even with no AUTO modes. If the
RCD under test is A type (which means sensitive to both AC and
undirectional pulsing leakage currents) it is advisable to effect the test both
with sine wave and undirectional pulse current with phase 0° and 180°.
