MI 2087 AL2 EasiTEST Measurement instructions
28
Check partial results (trip-out times) separately for each step from 1
st
up to 6
th
as well
as contact voltage at set nominal differential current (standard RCD type) or at double
nominal differential current (selective RCD type) by using the DISPLAY key.
If trip-out time in any step is out of allowed range (see the table 1) automatic test will
be stopped and appropriate message will be displayed (>xxx ms / <xxx ms), where
xxx means limit value according to the table 1.
If RCD trips during contact voltage measurement (some leakage current is already
flowing to PE conductor or tested RCD is too sensitive), blinking rcd message will be
displayed.
Test of Selective RCD
For safety reason, contact voltage measurement is carried out in each step
(regardless of RCD type) before trip-out time measurement is done. As the Selective
type of RCD (delayed trip-out) operates on basis of integration of fault current, it is
necessary to relax it, before Trip-out Time measurement is carried out, otherwise the
test is not relevant. That is why 30 s of waiting time is involved in some stepsm,
namely: Step 3, Step 4, Step 5 and Step 6. The waiting time is presented on display
as countdown from 30 to 0.
Notes:
q Limit contact voltage Ulim can be set in contact voltage function only!
q RCD type and Nominal differential current set in this function will be offered in
other RCD functions (wherever actual)!
q For safety reason automatic RCD test will be carried out only if contact voltage
at nominal differential current (standard RCD is selected) or at double nominal
differential current (selective RCD is selected) is lower than set limit value!
q Current flowing to PE protective conductor, caused by faulty appliances or
capacitive connection between L and PE terminals, will influence test result.
Disconnect such appliances before measurement is started!
q Specified accuracy of tested parameters is valid only if earthing system
connected to PE terminal is free of interfering voltages!
q “bat” message displayed during or after finishing the measurement means
batteries are too weak to guarantee correct result. Replace the batteries.
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