METREL Eurocheck CS 2099, User Manual, Page: 16 / 24

CS 2099 Eurocheck Eurocheck operation
16
4.8 RCD trip-out time calibration
Eurocheck simulates an RCD with I
Δ
n of 30 mA and trip-out time of 50 ms. Trip-out time
calibration will not trip an RCD if it’s present in installation where Eurocheck is
connected, regardless of selected I
Δ
n current.
Caution:
q
Pay special attention when selecting appropriate I
Δ
n current. It should be set
to 30 mA, and multiplier should be set to x1. Otherwise the reading of trip-out
time may be wrong.
RCD trip-out time calibration can be performed with universal test cable, plug cable or
even plug commander.
Step Action
1
q
Connect the tested instrument into Eurocheck RCD/Fault loop output
using one of available cables (plug cable, plug commander, universal
test cable); follow connection diagrams shown in Figure 4.1 and Figure
4.2.
2
q
Switch on the tested instrument and select RCD trip-out time function
(usually denoted as RCD t).
q
Set I
Δ
n to 30 mA and current multiplier to x1.
3
q
Connect Eurocheck into mains wall socket and enable its output.
q
Observe any warnings displayed on the tested instrument and
Eurocheck.
q
If Eurocheck signals incorrect L and N polarity, reverse connection.
4
q
Select RCD calibration function using RCD/LOOP button (RCD LED
lights when the function is selected).
q
Observe any warnings displayed on the tested instrument and
Eurocheck. If any is present, remove the causes before proceeding.
5
q
Perform RCD trip-out time measurement with the tested instrument.
q
30 mA RCD test current is verified simultaneously (chapter 4.9).
q
Write down measurement result for documentation purposes.
6
q
If measured trip-out time deviates significantly from 50 ms, it is very
likely the tested instrument is damaged. Send it to your distributor or
manufacturer for repair and/or readjustment.
7
q
Repeat steps 5 and 6 with reverse polarity of test current in RCD trip-out
time function (if the tested instrument enables reverse polarity selection).
Note:
q
Consider accuracy of RCD trip-out time measurement when evaluating
calibration results (accuracy is defined in User manual of your instrument).