Rcd Test; Tripping Time Rcdt (Auto) - Benning IT 105 CH Notice D'emploi

shows the prospective fault current (PFC)/short-circuit current (PSC).
Note:
For measuring the loop impedance Zs (L-PE) on three-phase loads without neutral conductor (e. g.
motors), the green measuring lead jack PE/L2 6 and the blue measuring lead jack N/L3 7 can be bridged
via the blue 4 mm adapter.

8.6 RCD test

Measurement requires correct connection of the mains voltage to the BENNING IT 105 as

shown in figures 4, 5 or 6. The mains voltage indicator must light permanently:
If the mains voltage indicator flashes, check the measuring leads for correct connection or the system part
for correct voltage potentials.
During measurement, the BENNING IT 105 monitors the contact voltage Uc applied to the
protective conductor (PE). If the contact voltage Uc > 25 V, ">25 V" is shown on the digital

display 2 and the user can continue the measurement at his/her sole discretion. If the con-
tact voltage Uc exceeds the value of > 50 V, ">50 V" will be shown on the digital display 2
and the measurement will be cancelled.
Potential fields from other earthing systems, considerable voltage differences between pro-

tective conductor and earth, protective conductor and neutral conductor or fault currents
behind the RCD might influence the measurement.
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The measuring time might be extended by connected loads behind the RCD.

8.6.1 Tripping time RCDt (AUTO)

Automatic measurement of the tripping time is a test consequence of single measurements with different
multipliers and initial polarities (0°/180°) of the nominal fault current (I∆N). The test is continued automati-
cally each time the RCD is switched on again.
- Select the desired function RCDt (AUTO) I with the rotary switch 1 .
- The symbols of the function keys F1 A to F4 D are briefly shown on the digital display 2 . You can
use the function keys F1 to F4 3 to make the following settings:
F1
–
RCD type (F2):
sinusoidal test current
pulsating test current
selective (delayed) RCD
For testing selective RCDs, measurement starts after a time delay of 30 seconds.
03/ 2020
½ x I∆N at 0°, ½ x I∆N at 180°
1 x I∆N at 0°, 1 x I∆N at 180°
5 x I∆N at 0°, 5 x I∆N at 180°
F2
► ►
BENNING IT 105 CH
F3
►

F4
I∆N
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