NOVA AND NOVA PRO
Measurements
28
Step 3
Connect the leads to the instrument and follow the connection diagram shown in
figure 5.15 (see the chapter
5.3.6 Contact voltage
) to perform trip-out time
measurement.
Step 4
Check for any warnings and check the online voltage/terminal monitor on the
display before starting the measurement. If everything is ok and the
is shown,
press the TEST key. After performing the measurement, the results appear on the
display together with the
or
indication.
Figure 5-16: Example of trip-out time measurement results
Notes:
Displayed results:
t ................
Trip-out time,
U
C ....................
Contact voltage.
❑
Parameters set in this function are also transferred onto all other RCD functions!
❑
RCD trip-out time measurement will be performed only if the contact voltage at
nominal differential current is lower than the limit set in the contact voltage setting!
❑
The measurement of the contact voltage in pre-test does not normally trip an RCD.
However, the trip limit may be exceeded as a result of leakage current flowing
through the PE protective conductor or a capacitive connection between L and PE
conductors.
5.3.8.
Trip-out current
This test is used to determine the minimum current required to trip the RCD. After the
measurement has been started, the test current generated by the instrument is continuously
increased, starting at 0.2
I
ΔN
to 1.1
I
ΔN
(to 1.5
I
ΔN
/ 2.2
I
ΔN
(I
ΔN
=10 mA)for pulsating DC residual
currents), until the RCD trips.
How to perform trip-out current measurement
Step 1
Select the
RCD
function FCT key and select the
Ramp
mode with the
▲▼
and
◀▶navigation
keys. The following menu will be displayed:
