BEHA UNITEST TELARIS Fi/RCD Mode D'emploi page 19

Any test and measurement procedures in cir-
cuits equipped with residual current devices
should only be performed after having con-
sulted the operator terminals (data processing
systems, material processing, motors, etc.).
For measurements on earthed sockets or
equipment with protective conductor connec-
tion, the protective earth must be checked for
correct connection by touching contact elec-
trode "PE". If an error is indicated via the sock-
et error symbol ( ), the PE connection must
be checked ! The user may only start the test,
once the protective conductor is properly con-
nected.
Prior to testing, we recommend all loads are
switched off as they could falsify the measure-
ment result.
The protective earth must be free of external
voltage for the RCD test. However if an extra-
neous voltage is present, the instrument only
indicates the voltage VC having been generat-
ed by the measurement. The measurement in-
terruption caused by excess of UL by VC is only
generated by the actual volt-age present be-
tween the neutral conductor (N) and the pro-
tective earth (PE).
Time-delayed residual current devices trip at
nominal resi-dual current within 130...500ms,
for double nominal fault current within
60...200 ms. Such RCDs are im-plemented as
main residual current protection devices
(please refer to IEC 61008-1) and are marked
with the symbol " S ".
The contact voltage represents the voltage pre-
sent during an insulation error between two si-
multaneously touchable components.
General Information about RCD Tests
At a measuring circuit without probe, available
voltages between PE and earth can influence
the measurement.
At use of the N-conductor as probe, the N-con-
ductor should be check first of all of correct and
low-ohm connection to neutral point of system
. A available voltage of the N conductor to the
earth can influence the measurement.
Leakage currents by preconnected loads can
influence the measuring.
Attached loads or operating supplies which
contains capacitors or circulating machines
can elongate the trip time.
Any test and measurement procedures in cir-
cuits equipped with residual current devices
should only be performed after having con-
sulted the operator terminals (data processing
systems, material processing, motors, etc.).
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