Functional Description; R F And C E In 'Chd' Mode (Chademo) - Bender ISOMETER isoCHA425 Manual

– BMS (Bender measuring device interface) for the data exchange with other Bender devices
– Modbus RTU
– IsoData (for continuous data output)
• Password protection against unauthorised changing of parameters
• Stop mode to disable the measuring pulse generator
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
• the one-sided insulation resistance R
• the system leakage capacitance C
• the system voltage U
• the DC system voltages (residual voltages) U
R and R are combined to the value R
FS FU
menu. The prewarning limit value can only be set higher than the alarm limit value. If the measured value
reaches or falls below the limit values, an alarm is signalled. For the measured value U
undervoltage limit value can be enabled and adjusted, the violation of which triggers an alarm. The limit
value alarms are deleted when the respective measured value no longer violates the limit value including the
corresponding hysteresis.
All alarms generated by the ISOMETER® are signalled via the LEDs 'AL1' and 'AL2'. In the 'out' menu, the alarms
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 until the reset button 'R' is pressed or the supply voltage U
interrupted.
In the 't' menu, the start-up delay at device start, the response delay and the delay on message release 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
The insulation fault R
F
≥ 50 V. The maximum permissible system leakage capacitance C
the value R is determined by the smaller of the values R
F
determined from the voltages U
;
FS
;
FU
;
e
(True RMS) between L+ and L–
n
. For R
F
and the system leakage capacitance C
and U
L1e L2e
and U between L+ as well as L– and earth.
L1e L2e
a prewarning and an alarm limit value can be set in the 'AL'
F
are only determined for DC system voltages
e
is 1.6 F per conductor. In mode 'CHd'
e
and R
FU FS
up to a maximum of 2 M .
isoCHA425_D00352_03_M_XXEN/08.2023
an overvoltage and
n
. R is the one-pole total insulation fault
FU
ISOMETER® isoCHA425
is
s
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