Functional Description - Bender ISOMETER isoCHA425HV Manual

Function
• Activatable fault memory
• RS-485 (galvanically isolated) including the following protocols:
– 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 for disabling the measuring pulse generator and in combination with AGH421-1 disconnection
from the monitored system.
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
Depending on the selected mode, R
limit value can be set in the "AL" 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 an overvoltage and undervoltage limit value can be enabled and adjusted, the violation of which
n
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. Using the AGH421-1,
stop mode also disconnects the ISOMETER® from the monitored system.
10 isoCHA425HV_D00404_04_M_XXEN/10.2023
FS
FU
e
(True RMS) between L1/+ and L2/–
n
and R
FS FU
and U between L1/+ as well as L2/– and earth
L1e L2e
are combined to the value R . For R a prewarning and an alarm
F F
is
s