Self-Checks & Health Monitoring - Siemens SICHARGE D Operating Instructions Manual

Description
3.10 Self-checks & health monitoring
Insulation monitoring
To ensure that the protection principle of galvanic isolation is adhered to, the vehicle's high-
voltage electrical system must not be grounded via electrically conductive material. For this
reason, an isolation monitoring device in the charging station constantly monitors the
resistance between the DC+ and DC- contacts to ground. If the low limit is violated, there is a
safety shutdown. The charging process is aborted, and the charging station performs a self-
test. After a successful test, the charging outlet is available again for the next charging
process.
In addition, the isolation monitoring device sends a message to the controller, which in turn
transmits the event to the SCB.
3.10 Self-checks & health monitoring
Among other things, the charging station checks these electrical conditions.
Insulation monitoring
The insulation resistances of the charging cable are monitored continuously. The insulation
monitoring device undergoes a self-test on a cyclic basis. Damage and faults in the charging
cable are thus immediately detected. During active charging, the insulation resistance of the
entire charging line is checked by connecting the outlet contactors.
Converter testing
During each boot process, it is checked whether the quick shutdown of the converters is
working correctly. The charging station detects the correct number of converters in a group
and whether the correct converter group goes into the fast shutdown. This feature ensures
additional operational reliability, especially with regard to retrofitting of converters.
Health monitoring
The charging station permanently monitors the feedback messages of the converters,
contactors, protective devices and fans. Malfunctions are detected and displayed in the SCB in
the form of error flags. This function is being improved and extended continuously.
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Operating Instructions, 11/2023, A5E50556539-AG
SICHARGE D