The fault was in the precharge response.
A comemso product specialist recorded the real vehicle–charger interaction with EVCA Multi Mobile. In comframe, the measured EVSE voltage response did not match the requested battery voltage during precharge.
Communication timing was unremarkable in that recording, allowing that suspected cause to be excluded for the observed attempt. The specialist reviewed voltage, current and communicated values together. A communication capture without electrical measurements would not have shown this relationship.
The specialist was experienced in using the product and also delivered product training. The analysis was performed by a person; it was not an automatic diagnosis.
From finding to correction.
The customer’s engineers adjusted the EVSE control parameters. After loading the changed software, a repeat charging test confirmed the correction for the observed vehicle–charger pairing.
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| Stage | Time | Included work |
|---|---|---|
| Connect prepared system | Up to 5 min | Laptop, Ethernet/CAN, EV and EVSE connections |
| Record charging attempt | 1–2 min | Measurement of the real pairing |
| Review recording | About 3 min | Human analysis in comframe by the product specialist |
| Correct control parameters | About 10 min | Software adjustment by customer engineers |
| Load and verify | Several additional minutes | Software transfer and repeat charging test |
These are estimates, not stopwatch measurements. Three minutes describes the analysis after recording, not the complete time to connect, measure and resolve the issue. This repeat test is evidence for the observed pairing, not a fleet-wide compatibility claim.
One device, field and laboratory.
The customer purchased EVCA Multi Mobile and a compact 3 kW bidirectional DC source/load. The same analyser supports field measurements and configured EV-simulation work in the laboratory.
The 3 kW rating belongs to this external laboratory source/load. It does not specify the power rating of every Multi Mobile field-measurement configuration. Voltage, current, power and duty cycle must be considered together.
What this account establishes.
This customer account concerns one vehicle–charger pairing. The finding came from engineering analysis of communication and measured electrical response; it does not establish a general diagnosis time or fleet-wide compatibility.
Source: anonymised customer account supplied by comemso. Underlying measurement data are retained internally and are not published here. The exact parameter values are not disclosed.