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docu: FAQ: reasons for failed cable check
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@ -420,6 +420,19 @@ That's is definitely a goal, and it was reached in the meanwhile. Of course, two
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For testing the communication at home, the pyPlc supports both sides of the CCS, the car and the charger. Have a
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look to [testing_and_simulation.md](doc/testing_and_simulation.md)
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### Q5: What can be the reason, that the charger reports a failed cable check?
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In the cable check phase, the charger checks the following things:
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1. CP/PE lines. The charger expects "State C", this means, the car must connect a diode and two resistors between the CP and the PE. This shall result in PWM levels of -12V and +6V. The charger measures these level, and will complain with CableCheck=Failed if it detects a mismatch. Some potential root causes for failed checks are:
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- CP is not connected at all.
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- Diode is missing or has wrong polarity.
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- Diode is too slow to handle the 1kHz/5%PWM.
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- Wrong resistor values chosen or too high tolerance of the resistors
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- Connection between circuit ground and PE missing
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- too high saturation voltage of the switch transistor
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- wrong coupling network between the CP/PE and the PLC modem transformator. This may disturb the PWM levels, due to low-pass-filtering or it may inject too much power from the PLC modem.
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- Software not configured to use the correct output path for the StateC switching
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2. Isolation of the DC path. It is recommended to use two contactors, one for each DC lines, to avoid asymmetrical results in the isolation measurements.
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## Credits
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Thanks to catphish to start the investigations regarding the homeplug modems and publishing them on OpenInverter forum.
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Thanks to johu for the OpenInverter forum, and for the first video of the early experiments, the beaglebone integration and CHAdeMO integration.
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