MI 3122 Smartec Z Line-Loop / RCD
Warnings and notes
7
RCD functions
Parameters set in one function are also kept for other RCD functions.
The Contact voltage test will normally not trip-out RCD of tested installation.
However, the RCD trip-out may occur and Uc measurement is affected as a result
of existing PE leakage currents in the installation.
RCD trip-out current and time will be measured only if the contact voltage - pretest
passed successfully.
L and N test terminals are reversed automatically according to detected terminal
voltage (except in UK version).
It can happen that the RCD trips-out during the safety pretests. Possible reasons for
trip-out are incorrect set RCD parameters (I
N
), existing leakage currents or
defective RCD.
Z-LOOP
The Z-LOOP impedance function will trip-out the RCD in RCD protected installation
that is tested. Use the Zs
rcd
impedance function to prevent the trip-out.
The Zs
rcd
impedance function takes longer time to complete but has much better
accuracy then R
L
sub-result in RCD: Uc function.
Specified accuracy of tested parameters is valid only if mains voltage is stable
during the measurement.
L and N test terminals are reversed automatically according to detected terminal
voltage (except in UK version).
Z-LINE
In case of measurement of Z
Line-Line
with the instrument test leads PE and N
connected together the instrument will display a warning of dangerous PE voltage.
The measurement will be performed anyway.
Specified accuracy of tested parameters is valid only if mains voltage is stable
during the measurement.
L and N test terminals are reversed automatically according to detected terminal
voltage (except in UK version).
