Fault Location R; System Leakage Capacitance C E; System Voltages U L1E And U L2E; Functional Tests Of Contactors In The Charging Station And The Vehicle - Bender ISOMETER isoCHA425HV Manual

2.3.3 Fault location R%

From U > DC 20 V the fault location R% is calculated for two-pole insulation faults R
n
("CHd" mode 150 kΩ). The value -100 % indicates a single-pole insulation fault at L2/-, 0 % indicates a
symmetrical insulation fault and +100 % indicates a single-pole insulation fault at L1/+. For values of 30
% and more, the alarm assignment of the relays distinguishes between insulation faults at L1/+ and L2/-
.
From the values R% and R
mulas:
Fault at conductor DC+ ->R
Fault at conductor DC- -> R
2.3.4 System leakage capacitance C
The system leakage capacitance C
Above 12 µF, the message Device error "E.07" is displayed.
2.3.5 System voltages U
The system voltage U
ues for overvoltage and undervoltage are available in the "AL" menu
1200 V, the message "Overvoltage" is displayed regardless of the set overvoltage limit value.
The DC system voltages U
and earth. No limit value is assigned to them.

2.3.6 Functional tests of contactors in the charging station and the vehicle

If the ISOMETER® is disconnected on one pole from the monitored voltage source during a functional
test of the charging station or vehicle contactors, a false alarm may occur depending on the location of
an existing insulation fault. For insulation faults above 600 kΩ the false alarm can be prevented by a re-
sistor of 200 kΩ connected directly between terminals L1/+ and L2/-.

2.3.7 Monitoring of the insulation resistance

The two parameters "R1" and "R2" for monitoring the insulation resistance can be found in the response
value menu "AL" (see chapter " 'AL'
the insulation resistance R
alarm message. If R
F

2.3.8 Undervoltage/overvoltage monitoring

In the response value menu "AL"
monitoring the system voltage U
limited by the overvoltage value. The RMS value of the nominal system voltage U
nominal system voltage U
be signalled. If the maximum permissible nominal system voltage U
an alarm message will be triggered even if the overvoltage limit value has been deactivated. The alarm
will be deleted when the limit values plus the hysteresis are no longer violated.
the partial resistances R
F
= (200 % * R
F+
= (200 % * R
F-
is determined for insulation faults R
e
, U and U
n L1e
between terminals L1/+ and L2/- is measured as RMS value (True RMS). Limit val-
n
and U are respectively measured between terminals L1/+ as well as L2/-
L1e L2e
menu"). The value "R1" can only be set higher than the value "R2". If
reaches or falls below the activated values "R1" or "R2", this leads to an
F
exceeds the values "R1" or "R2" plus the hysteresis value, the alarm will be cleared.
(see chapter " 'AL'
can be activated or deactivated. The maximum undervoltage value is
n
reaches, falls below or exceeds the limit values "U <" or "U >", an alarm will
n
and R - can be calculated using the following for-
F+ F
)/(100 % + R%)
F
)/(100 % – R%)
F
e
L2e
menu"), the two parameters "U <" and "U >" for
isoCHA425HV_D00404_00_M_XXEN / 10.2020
ISOMETER® isoCHA425HV with AGH420-1
FS
> 10 kΩ up to a value of 17 µF.
F
(see chapter " 'AL'
is monitored. If the
n
set for the ISOMETER® is exceeded,
n
up to 500 kΩ
menu"). Above
9