Benning IT 105, Operating Manual

Page: 32 / 63

03/ 2020 BENNING IT 105 CH 26
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► ► ►
I ∆ N nominal fault current (F4):
Press the function key F4 to select the nominal fault current:
Available nominal fault currents (sinusoidal testing current) :
10 mA 30 mA 100 mA 300 mA 500 mA
½ I ∆ N
    
1 I ∆ N
    
5 I ∆ N
  
- Connect the measuring leads to the BENNING IT 105 as shown in figures 4 or 5 and apply them to the
test object.
- Press the TEST key
4
to start the measurement.
- The measured tripping time is shown on the main display
K
.
8.6.3 Tripping current RCD
I
- Select the desired function RCD
I M
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 F2 F3 F4
0° / 180° – I ∆ N
0°/ 180° (F1):
0°: Testing current with positive initial polarity
180°: Testing current with negative initial polarity
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.
► ► ►
I ∆ N nominal fault current (F4):
Press the function key F4 to select the nominal fault current:
Nominal fault currents at RCD type AC :
10 mA ► 30 mA ► 100 mA ► 300mA ► 500 mA
- Connect the measuring leads to the BENNING IT 105 as shown in figures 4 or 5 and apply them to the
test object.
- Press the TEST key
4
to start the measurement.
- The measured tripping time is shown on the main display
K
.