HT instruments SPEED418 - Manual (Page 28)

400 Series
EN - 27
RCD
The virtual RCD key enables the selection of the RCD type, which
may be: AC, AC S, A, A S (the options A, A S are not available if
the electrical system set is IT)
UL
The virtual UL key allows setting the limit value of contact voltage
for the system being tested, which may be: 25V, 50V
3. Should you have any doubt regarding the correct value, we suggest setting the limit
value for contact voltage to 25V, as it is the lowest limit (for safety reasons).
4. Insert the green, blue and black connectors of the three-pin shuko cable into the
corresponding input leads E, N and P of the instrument. As an alternative, use the
single cables and apply the relevant alligator clips to the free ends of the cables. It is
also possible to use the remote probe by inserting its multipolar connector into the
input lead P. Connect the shuko plug, the alligator clips or the remote probe to the
electrical mains according to Fig. 10, Fig. 11, Fig. 12, Fig. 13 and Fig. 14.
6.4.1. AUTO
mode
5.
Press the GO/STOP key on the instrument or the START key on remote
probe. The instrument will start the measurement.
6. The instrument performs the following six tests referred to nominal current:
 IdN x ½ with 0° phase (the RCD must not trip)
 IdN x ½ with 180° phase (the RCD must not trip)
 IdN x 1 with 0° phase (the RCD must trip, reset the switch)
 IdN x 1 with 180° phase (the RCD must trip, reset the switch)
 IdN x 5 with 0° phase (the RCD must trip, reset the switch)
 IdN x 5 with 180° phase (the RCD must trip, end of test).
7. The test has a positive result if all tripping times comply with what indicated in Tab. 5.
The test has a negative result when one of the value is out of range.
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.
5. The “AUTO” test is not available for 500mA and 650mA A-type RCDs.
6. While performing the test,
the instrument supplies a
leakage voltage according to
the multiplier and to the
phase indicated on the
display. From the third test
on, the RDC should trip and,
subsequently, the operator
will have to reset it
R C D
0° 180°
x 1 / 2 > 9 9 9 m s > 9 9 9 m s
x 1 2 8 m s
- - - m s
x 5 - - - m s - - - m s
FRQ=50.0Hz Ut=1.4V
VP-N=228V VP-Pe=228V
Tripping times of the RCD at the
different currents provided for in the
test
RESUME RCD
The operator is asked to resume the
RCD
AUTO 30mA 50V
Func IdN RCD UL