Operation Manual

CS 2099 Eurocheck Eurocheck operation
14
4.6 Trip-lock impedance calibration
Fault loop impedance is measured between L and PE conductors. Trip-lock 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.
Trip-lock impedance calibration can be performed with universal test cable, plug cable
or even plug commander. Calibration can be performed with all IΔn currents supported
by the tested instrument (even IΔn=10 mA).
Calibration procedure is basically the same as the procedure for fault loop impedance
function (chapter 4.5). Only differences between both procedures are noted below.
Step Action
1 q The same as fault loop impedance function.
q Follow connection diagrams shown in Figure 4.1 and Figure 4.2.
2 q Switch on the tested instrument and enter trip-lock impedance function.
q Select appropriate IΔn current. All IΔn currents are supported.
3 q The same as fault loop impedance function.
4 q The same as fault loop impedance function.
5 q Perform trip-lock 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 The same as fault loop impedance function.
7 q Perform trip-lock 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 trip-lock
impedance function (if the tested instrument enables reverse polarity
selection).
Notes:
q In some instruments the function is named “Rs resistance”, “Rl resistance”
“loop(rcd) or “loop(rcd10mA). The calibration procedure is the same, regardless
of the name.