Chauvin Arnoux C.A 6115N, User Manual

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5.5.6 Error indications
Display Meaning Comments
Measurement not possible, Voltage > 20 V on the input, for example
Voltage present on network voltage not cut
measurement input
Measured value greater than
Resistance exceeding the measurement
600 M
Ω
(at 500V) or
range, lead cut or badly connected
300 M
Ω
(at 100V - 250 V)
Measured value below Activation of user alarm!
set LIMIT Short-circuit on line, possibly
N – PE bridges
Measurement not possible
Wrong connection of instrument
test leads
Charge the battery – if this is not possible,
Measurement not possible,
the charging fuse is perhaps defective
Battery too low
see “Replacing the fuses”
5.6 RCD testing
The RCD-FI measurement function enables the correct working order of RCD’s to be checked. Nominal
fault currents I
∆
N
of 10 / 30 / 100 / 300 / 500 mA and “VAR” position of 6 mA to 1000 mA can be selected.
The fault voltage “U
F
”(at I
∆
N
), the trip current “I
A
” and the trip duration “t
A
” can be measured.
Additionally, the test currents 2x I
∆
N
, 5x I
∆
N
and 150/250 mA are also available.
When using the earth probe, the earth resistance “R
A
” can also be measured!
Without the earth probe, the loop resistance “R
S
” and the short-circuit current “Ik” can also be measured.
For all test currents, measurement of the fault voltage, loop resistance, short-circuit current and
earth resistance is possible at the same time as an RCD test, without tripping 30 mA RCD’s.
When measuring tripping time, for safety reasons the current is interrupted after 500 ms if the RCD
doesn’t trip.
To test the permitted fault voltage on old installations (65 V) with tripping, a self-adaptive measurement
procedure is used which, if the fault voltage increases, reduces the permitted tripping duration to 100
ms, in compliance with EN 61010.
If using the earth probe, parasite voltages of up to 70 V can be displayed and do not distort the
measurement. If the interference voltage exceeds 70 V, measurement is not begun. The maximum earth
probe resistance tolerated is 15 k
Ω
.
NOTE: Unstable measurements caused by heavy disturbances in the mains supply can be reduced by
making a long press on the “TEST” button (available since Version 2.8)
5.6.1 Description of the function
After the test of voltages U
L-PE
and U
N-PE
, the current source is applied to the highest voltage in relation to
the PE.
First of all, the instrument circulates a current < 40% of I
∆
N
, so as to calculate the fault voltage and the
loop resistance (Z
S
then the fault voltage U
F
= Z
S
x I
∆
N
) without tripping the RCD.
If the earth probe is used, the voltage of this probe is measured in a closed circuit and the fault voltage
and the earth resistance are calculated from this value.