LEM SATURN 100 plus Manuel D'utilisation page 29

Measuring
3.7.2 Testing Selective FI-Circuit Breakers (Types S+ G):
This measuring function serves to test the protective measures „Fault-current-
protection circuit" when using selective (short-term delayed) and conditionally
surge-current-proof fault-current circuit breakers. It is possible to measure contact
voltage, earth/ground connection resistance or loop resistance as well as tripping
time at nominal fault currents of I 10, 30, 100, 300 or 500 mA (for U
DN
only 10, 30, 100 mA).
For this measurement the same rules and notes apply as described in section
3.7.1. Therefore only the differences from the test of standard FI-circuit breakers
are explained below.
Measuring Process:
R
R
B
A
Probe
Marker
> 20m
Instrument
Connection for use with a probe
FI
Observe overload capacity and connect instrument as shown.
Turn central selector in mode RCD to desired nominal fault current I
n n n n
S
Press key „ , x5, " until the symbol
T
Press key „ "for measurement without tripping the
R
Press key „Start".
For the check with tripping, a 30 s measuring pause is inserted after prechecking,
during which a countdown from 60 to 0 takes place on the display (see also „Notes
on the Measuring
Sequence"). This phase can be disabled by again pressing key
however, essential for determining the true tripping time and must therefore not be
disabled for tripping-time measurements.
Read measured value, contact voltage „U
„Display" brings up the loop resistance „R
< 152 V
L-PE
L 1
L 2
L 3
L2
L2
N
P E
L1 L3
(PEN)
M
L1
L 1 = brown
L 2 = black
L3
L 3 = purple
Instrument
Instrument
.
DN
S
is displayed.
S FI-circuit breakers.
R
„Start" t is,
S
". Repeated pressing of key
L
", in case of use of a probe the
S
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