MI 2087 AL2 EasiTEST
Measurement instructions
20
Step 8
(looP function is selected)
q
Press the
START
key and release it, the measurement will start to run. Three
dots (
. . .
) will flash until the measurement is finished, then the result is
displayed. The measurement may last longer (up to 1 min approx.) in order to
assure accurate and stabile test result.
q
Check contact voltage subresult (Uc at I
∆
N
– standard RCD or Uc at 2I
∆
N
–
selective RCD) and preset limit contact voltage by using the
DISPLAY
key.
Notes:
q
If RCD trips during the measurement (some fault or leakage current is probably
already flowing to ground) “
rcd
”
mark will start to blink.
q
RCD type, limit contact voltage, and nominal differential current set in this
function will be offered in other RCD functions (wherever actual)!
q
Current flowing to PE protective conductor, caused by faulty appliances or
capacitive connection between L and PE terminals will influence the test result.
Disconnect such appliances before the measurement is started!
q
Specified accuracy of Uc/R
L
measurement 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.
3.4 RCD - Trip-out time
In order to assure safe conditions, RCD device must trip-out within a certain time,
in case of present fault on connected electric appliance. See allowed trip-out time
ranges in the following table.
Type of RCD
protection
switch
I
∆
n
2I
∆
n
5I
∆
n*
Remark
Standard
300 ms
150 ms
40 ms
max. allowed trip-
out time
500 ms
200 ms
150 ms
max. allowed trip-
out time
Selective
130 ms
60 ms
50 ms
min. allowed trip-
out time
* If I
∆
N
≤
30 mA, test current of 0,25 A is used instead of 5I
∆
N
.
Table 1:
Allowed trip-out times according to EN 61009 standard
For additional general information concerning the measurement, refer to enclosed
handbook
Measurements on electric installations in practice and theory
.
