METREL EasiPLUS MI 3000 - Page 35

MI 3000 EasiPLUS Measurements
35
How to perform trip-out current measurement
Step 1 Select RCD function with the function selector and use the / keys to select
the Trip-out current (RCD ) function. The following menu is displayed:
Figure 5.19: Trip-out current measurement menu
Step 2 By using cursor keys the following parameters can be set in this
measurement:
 Nominal residual current,
 RCD type,
 Test current starting polarity.
Step 3 Connect the test 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 current measurements.
Step 4 Check for any warnings and check the online voltage/terminal monitor shown
on the display before starting the measurement. If everything is ok, press the
TEST key. After performing the measurement, the results will be displayed
along with a PASS/FAIL indication.
Figure 5.20: Example of trip-out current measurement result
Displayed results:
I

.............Trip-out current,
U
Ci
..........Contact voltage,
tI .............Trip-out time.
Notes:
 Parameters set in this function are also kept for other RCD functions!
 RCD trip-out current measurement will be performed only if the contact voltage at
nominal differential current is lower than set limit contact voltage!
 The measurement of contact voltage in the 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.