VR2250
Page 26 of 131
The
F2
key permits to select one of the following rated tripping currents of the
RCD (which can be shown cyclically when pressing the key):
10mA.
30mA.
100mA.
300mA.
500mA.
The
F3
key permits to select the RCD type (which can be shown cyclically
when pressing the key):
"
α
":
general RCD AC type (sensitive to sine leakage current)
"
κ
":
general RCD A type (sensitive to pulsating leakage current)
"
αµ
":
selective RCD AC type (sensitive to sine leakage current)
"
κµ
":
selective RCD A type (sensitive to pulsating leakage current)
Note
if the test is performed on
general RCDs
the symbol
µ
is NOT displayed
Note
according to EN61008 the test on the selective RCDs requires an interval between
the tests of 60 seconds (30 seconds in case of tests at ½ I
∆
n
). A timer is displayed
indicating the waiting time for each step.
Example
:
Test with AUTO mode on a RCD with I
∆
n
=30mA.
a) The instrument performs the test at ½ I
∆
n
0°. The RCD must
not trip.
b) The instrument performs the test at ½ I
∆
n
180°. The RCD
must not trip. For a Selective RCD a 30 seconds timer starts
before executing next test.
c) The instrument performs the test at I
∆
n
0°. If the RCD
passed the test, it must trip and the instrument shows the
message "RESUME RCD". The operator shall resume the
RCD. For a Selective RCD a 60 seconds timer starts before
executing the next test.
d) The instrument performs the test at I
∆
n
180°. Follow the
same procedure as described under c).
e) The instrument performs the test at 5I
∆
n
0°. Follow the same
procedure as described under c).
f) The instrument performs the test at 5I
∆
n
180°. Follow the
same procedure as described under c). The test is
completed.
The F4 key permits to select one of the following
limit values for the
contact voltage
(which can be shown cyclically when pressing the key):
50V
(default)
25V.
CAUTION
Never disconnect the test leads when the message
"MEASURING"
is
displayed.
