LEM SATURN 100 plus Instrucciones De Uso página 31

Measuring
NOTES ON THE MEASURING SEQUENCE:
The measuring sequence corresponds to that of the standard RCD test, see section
3.7.1 „Notes on the Measuring Sequence"; however, computation of the measured
values and the test for tripping.
According to the following formula U L = I ∆N x R S or I ∆N x R A
at twice the nominal fault current.
Moreover, for testing with tripping, a measuring pause of 30 seconds is inserted
between measuring phases 2 and 3, during which a countdown from 60 to 0 is
effected on the display. When the display reaches 0, measuring phase 3, tripping of
the FI-circuit breakers, is performed.
The reason for this delay is the internal design of S
FI circuit breakers. They
feature an energy-storage circuit with a comparatively large self-discharge time
constant, which receives a charge based on the automatic pre-test and would
therefore trip too soon during the tripping test. The „waiting period" of 30 seconds
cancels this effect, so that the tripping time „t " is measured correctly.
A
Error Messages:
Flashing symbols on the display generally signify illegal conditions or errors, for
further information see section 3.11 „Display hints".
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