Operation Manual

CS 2099 Eurocheck Eurocheck operation
12
4.5 Fault loop impedance calibration
Fault loop impedance is measured between L and PE conductors. Fault loop calibration
will not trip an RCD if it’s present in installation where Eurocheck is connected,
regardless of selected IΔn current.
Caution:
q When performing fault loop impedance calibration Eurocheck connects fault
loop calibration output to mains line impedance (L and N, important when
evaluating calibration measurement results).
q When evaluating absolute measured values first perform line impedance
measurement of the wall socket to which Eurocheck is then connected. Consider
that the impedance of Eurocheck mains cable is added to this value.
Fault loop impedance 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 fault loop impedance
function.
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 LOOP+11 Ω function on Eurocheck using RCD/LOOP button,
LOOP+11 Ω LED lights.
q Observe any warnings displayed on the tested instrument and
Eurocheck. If any is present, remove the causes before proceeding.
5 q Perform fault loop impedance measurement with the tested instrument.
q Write down measurement result for documentation purposes (it will be in
11 Ω – 12 Ω range in most cases).
6 q Select LOOP+1 Ω function on Eurocheck, LOOP+1 Ω LED lights.
q Observe any warnings displayed on the tested instrument and
Eurocheck. If any is present, remove the causes before proceeding.
7 q Perform fault loop impedance measurement with the tested instrument.
q Write down measurement result for documentation purposes (it will be in
1 Ω – 2 Ω range in most cases).
8 q Calculate the difference between LOOP+11 Ω and LOOP+1 Ω
measurement results – it has to be close to 9.8 Ω (see Eurocheck
technical specification).
q If impedance difference deviates significantly from 9.8 Ω, it is very likely
the tested instrument is damaged. Send it to your distributor or
manufacturer for repair and/or readjustment.
9 q Repeat steps 4 – 8 with reverse polarity of test current in fault loop
impedance function (if the tested instrument enables reverse polarity
selection).