Functional Description; And C In "Chd" Mode (Chademo); And C In "Dc" Mode (Ccs) - Bender ISOMETER isoCHA425HV Manual

Function
2.3

Functional description

The ISOMETER® is designed for use in DC charging stations according to CHAdeMo standard or
Combined Charging System (CCS) and can be set to the respective mode in the "SEt" menu via the
Mode parameter. It measures the total insulation resistance R
sistance R , the system leakage capacitance C
FU
L2/- and the DC system voltages (residual voltages) U
earth.
Depending on the selected mode, the values R
In the "AL" menu, a prewarning and a main alarm limit value can be set for the measured value R
prewarning limit value can only be set higher than the main alarm limit value. If the measured value
reaches or falls below the limit values, an alarm is signalled. For the measured value U
and undervoltage limit value can be enabled and adjusted, the violation of which triggers an alarm. The
limit value alarms are only deleted when the respective measured value no longer violates the limit val-
ue including the corresponding hysteresis.
All alarms generated by the ISOMETER® are signalled via the LEDs "AL1" and "AL2". In the "out" menu,
the LEDs can be assigned to the alarm relays ("K1, K2"). In addition, the operation of the alarm relays
(n.o./n.c.) can be configured and the fault memory "M" can be activated or deactivated. If the fault
memory is activated, the alarm relays remain in alarm condition and the LEDs light until the reset but-
ton "R" is pressed or the supply voltage U
In the "t" menu, the start-up delay at device start, the response delay and the delay on release of the
alarms as well as the repetition time of the automatic device self test can be set.
For the RS-485 interface, the protocols BMS, Modbus RTU or isoData are selected in the "out" menu. The
measured values can be read and the parameters of the ISOMETER® can be set via the BMS protocols,
e.g. using the BMS Ethernet gateway (COM465IP) and Modbus RTU. If the isoData protocol is selected,
the ISOMETER® only sends the measured values, once per second.
The device function can be tested using the test button "T". The device parameters are set via the LC
display and via the control buttons on the front panel. This function can be password-protected.
The ISOMETER® can be set to stop mode to deactivate the measuring pulse generator.
2.3.1 R and C in "CHd" mode (CHAdeMO)
F e
In "CHd" mode, the insulation fault R
DC system voltages ≥ 50 V. The value R
R is the one-sided insulation fault determined based on the voltages U
FU
of 2 MΩ. R is the two-pole, symmetrical insulation fault and is only determined up to a maximum of
FS
160 kΩ. The response time of the single-pole insulation fault R
U >= 100 V and 2 s above these values. For the two-pole insulation fault R
n
The maximum permissible system leakage capacitance C
2.3.2 R and C in "dc" mode (CCS)
F e
In "dc" mode, the insulation fault R
independently of the system voltage. The maximum permissible system leakage capacitance in this
mode is 5 µF. The response time for R
8 isoCHA425HV_D00404_00_M_XXEN / 10.2020
, the system voltage U
e
L1e
and R
FS FU
is interrupted.
s
and the system leakage capacitance C
F
is determined from the smaller one of the values R
F
up to 2 MΩ and the system leakage capacitance C
F
is 10 s.
F
as well as the one-sided insulation re-
FS
(True RMS) between L1/+ and
n
and U between L1/+ as well as L2/- and
L2e
are combined to form the measured value R
e
and U
L1e
is 1 s for limit values up to 100 kΩ and
FU
FS
is 1.6 µF per conductor.
e
F
, an overvoltage
n
are only determined for
and R
FU
up to a maximum
L2e
it is 10 s.
are determined
e
.
F
. The
.
FS