Siemens VersiCharge 8EM1310-F.0 Series Operating Instructions Manual page 66

Faults
7.4 Error cases
Meter error
If communication with the Bauer meter is disrupted, for example, by a CRC error before the
start of the charging process, the charging process is not created.
If the meter error occurs after a successfully started charging process, there are two
scenarios.
The process is described in the following sequence:
1. During a normal charging process, the charger regularly fetches the raw meter values
from the meter and forwards them to the backend via OCPP.
2. If an error occurs in the meter (for example, internal error of the meter, communication
error with the meter), the charger sends the meter error to the backend as
StatusNotification.
3. While the user or the EV has not yet ended the charging process and the meter has not yet
been restored, the charger sends a StopTransaction to the backend only with a signed
start snapshot.
Charge control error
An error in charge control during a charging process interrupts the charging process
immediately. An unexpected interruption of the charging process can have a negative impact
on correct customer billing if this fault is not detected and handled properly. To ensure that
the meter data of the charging process is always complete with a valid meter value for the
beginning and end of the charging process, the charger detects each internal error and ends
the charging process by sending a snapshot for the end of the charging process to the Bauer
meter.
The process is described in the following sequence:
1. During a normal charging process, the charger detects an internal control error.
2. The charger opens the AC relay and interrupts the charging process.
3. The charger fetches the signed stop snapshot from the meter and deletes the metadata of
this charging process in the meter.
4. The charger sends a StopTransaction request with a signed start and stop snapshot to the
backend.
OCPP connection error
An OCPP connection error during a charging process is handled by the charger. When the
connection is restored, the charger sends the snapshots of the charging process to the
backend.
1. During a normal charging process, an interrupted OCPP connection has no effect on the
running charging process.
2. While the user or the EV has not yet ended the charging process and the OCPP connection
has not yet been restored, the charger fetches the signed stop snapshot as usual and
retains the data.
3. When the OCPP connection has been restored, the charger sends a StopTransaction
request with a signed start and stop snapshot to the backend.
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VersiCharge AC Wallbox Operating Instructions ERK
Operating Instructions, 08/2023, A5E51549696-AC