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

L-PE or L-N (F1):
When measuring with a low testing current, a test of the loop impedance (Z
(Z ) will be carried out simultaneously. After the measurement has been carried out, the measuring result
I
can be called via the function key F1 3 .
AUTO start (F4):
With the Auto start function being enabled, measurement will be started 4 seconds after the BENNING IT 105
has been connected to the mains voltage. Press the function key F4 3 again to disable the function.
- Connect the measuring leads to the BENNING IT 105 as shown in figures 4, 5 or 6 and apply them to
the test object.
- Press the TEST key 4 to start the measurement.
- The main display K shows the loop impedance (Z
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 turn the shock-
proof plug of the test cable by 180°.
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.

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
–
04/ 2020
)/line impedance (Z
S
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
) and of the line impedance
S
) and the secondary display J
I
F3

F4
I∆N
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