Safety Information; Functional Description - Bender ISOMETER isoCHA425 Kurzanleitung

2. Safety information

Installation, connection and commissioning of electrical equipment shall only
be carried out by qualified electricians. Particular attention must be paid to:
Current safety regulations, in particular DIN EN 50110
 
Enclosed sheet "Important safety instructions for Bender products".
 

3. Functional description

The ISOMETER® measures the insulation resistance R
according to the Japanese charging standard CHAdeMO.
3.1 General measuring functions
The ISOMETER® measures the RMS value (trueRMS) of the system voltage U
between L+ and L- as well as the DC voltages between L+ and earth (U
between L- and earth (U
It determines from a minimum value of the DC system voltage the fault loca-
tion "R %", which shows the distribution of the insulation resistance between
conductors L+ and L-. The distribution is indicated by a "+" or "-" sign preced-
ing the insulation resistance measurement. The value range of the fault loca-
tion is ±100 %:
Indication
-100 % One-sided fault on conductor L-
0 % Symmetrical fault
+100 % One-sided fault on conductor L+
The partial resistances can be calculated from the total insulation resistance R
and the fault location (R %) using the following formula:
Fault on conductor L+ ->R
Fault on conductor L- -> R
isoCHA425_D00352_00_Q_DEEN/04.2018
).
L-e
= (200 % * R
L+F
= (200 % * R
L-F
of DC charging stations
F
Meaning
)/(100 % + R%)
F
)/(100 % – R%)
F
n
) and
L+e
F
15