Bender ISOMETER isoGEN423 Kurzanleitung Seite 16

3.3 General measuring functions
If the ISOMETER® is coupled to a DC system, it determines the fault location
"R%" from a minimum value of the DC system voltage, which shows the distri-
bution of the insulation resistance between conductors L1/+ and L2/-. The dis-
tribution is indicated by a positive or negative sign preceding the insulation
resistance measurement. The value range of the fault location is ±100 %.
The determination of the fault location in an AC system is only possible in an
interconnected DC network and the fault is located either on L1/+ (100%) or
L2/- (-100%). The error distribution calculation is, in this case, not possible.
It is possible to assign the detected fault or the faulty conductor to an alarm
relay by means of a menu. If the values of R or U exceed the activated res-
F n
ponse values specified in the "AL" menu for the duration t without interrup-
on
tion, a message is displayed via the LEDs AL1/AL2 as well as the relays K1 and
K2 according to the settings in the message assignment in the "out" menu. In
addition, the operation of the relays (n.o./n.c.) and the error memory "M" can
also be activated here.
If the values of R or U exceed the release value (response value plus hystere-
F n
sis) for the period t without interruption, the alarm relays will switch back to
off
their initial position and the alarm LEDs AL1/AL2 go out. If the fault memory is
activated, the alarm relays remain in the alarm condition and the LEDs light
until the reset button "R" is pressed or the supply voltage is interrupted. The
device function can be checked with the test key "T". Device parameterization
is carried out via the LC display and the frontpanel control buttons, and can be
protected by a password.
Information concerning access via the BMS and Modbus RTU protocols
and isoData datastrings can be found the manual.
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