HT instruments SIRIUS87 User Manual
Page 30
SIRIUS
87
EN - 28
4.3.1.5. Mode
"U
t
"
4.
Press
the
START/STOP key once: the instrument carries out the
test.
If the RCD does NOT trip the
instrument emits a
double sound
signal indicating the positive
outcome of the test and displays the
screen alongside.
RCD
~
1.4
V
OK
N
30
m
A
49
U
t
0° U
L
=
50
V
SAVING:
The tests can be stored pressing the
SAVE key twice
(according to § 5.1).
4.3.2. Tripping times for the general and selective RCDs
If the parameters set on the instrument are in keeping with the type of RCD under test
(and if this works correctly) the test with leakage current I
N
x1, I
N
x2, I
N
x5
SHALL
cause the RCD tripping within the times set according to the following table:
RCD type
I
N
x 1
I
N
x 2
I
N
x 5
Description
General 0.3s
0.15s
0.04s
Max tripping time in seconds
Selective
S
0.5s 0.20s 0.15s
Max tripping time in seconds
0.13s 0.05s 0.05s
Minimum delay tripping time in
seconds
* For rated values I
N 30mA the test current at five times is 0.25A.
For currents equal to ½
I
N
the RCD shall not trip in any case.
Table 3: Tripping times for tests with leakage currents I
N
x1, I
N
x2, I
N
x5 and AUTO
Value of earth resistance
R
a
. The display of the
message "
o.r." means that the instrument detected
a resistance higher than 1999
.
Value of contact voltage
U
t
detected referred to the
rated value of the RCD current set.
It indicates if the
test was carried
out with current
phase 0° or 180°
with respect to
the voltage.
SAVE
OK: indicates that
the RCD passed
the test.
or RCD
START
STOP