ElectroYou

Detailed Zero-Ohm-Emulator info

Many Renault ZOE owners have reported problems charging their vehicle. Either a permanent failure at specific charge posts (that works with other electric cars), or intermittent problems allowing charge one day, but refusing it the next. Renault ZOE is particularly picky about the charge post’s earth connection, refusing charge at otherwise sufficiently grounded places. The problem is present with fixed charging posts, with 400V outlets feeding mobile 11kW chargers, and with single phase 230V charging – used when visiting friends and other places where 400V is not available.
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Renault ZOE in contrast is very demanding as it requires less than 200 Ohm ground loop resistance,
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The earth loop resistance is around 250 Ohm, and ZOE charging therefore fails with the dreaded error message “Check charging post” – or on newer models a more specific message saying “Bad earth connection”
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The Zero-Ohm-Emulator measures the ground loop resistance and only interacts if the basic PE ground resistance is well below all safety limits. It can sense when the Renault query occurs, and will then for a very short time virtually lower the ground loop resistance to satisfy the charging requirements. Once charging starts, the Zero-Ohm-Emulator can be taken out – or it can stay inserted.
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The Zero-Ohm-Emulator comes with Schuko 230V male plug, and on the front side a Schuko 230V outlet, these two are directly connected together. A brightly lit RED indicator showing a poor earth connection can also occur if the power pins (L and N) are reversed. The box can then be turned and inserted the other way (the Schuko plug allows this). If the RED indicator turns off now, the right box position is established.
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The box is fully CE marked, this implies that all RoHS demands are met and lead-free soldering is used.

elfo ha scritto:Quello che mi piacerebbe sapere e' il motivo per cui la Zoe vuole il "neutro" per attivare la carica e se una resistenza di terra "cattiva" c'entra con il problema del neutro e della ricarica.

Charger

Charging port in the "nose" of the Zoe, for many years AC-only Type2 as DC CCS2 was introduced in some models in 2019
Renault Zoe uses 'Chameleon' onboard charger, that repurposes motor power electronics to charge the battery. Motor windings are used as power inductor for boost (single phase power) or buck (3 phase power) converter. This system saves on number of components, but it has several downsides:

There is no galvanic isolation between the grid and the battery. Because of this, Zoe has very strict HV fault and ground tests and will not charge if ground-neutral resistance is more 100 ohm. To perform this test, Zoe injects 20mA pulse between ground and neutral, and might trip some RCDs.

Caricabatterie

Porta di ricarica nel "naso" della Zoe, per molti anni solo CA Tipo 2 poiché CC CCS2 è stato introdotto in alcuni modelli nel 2019
Renault Zoe utilizza il caricabatteria di bordo "Chameleon", che riutilizza l'elettronica di potenza del motore per caricare la batteria. Gli avvolgimenti del motore vengono utilizzati come induttore di potenza per il convertitore boost (potenza monofase) o buck (potenza trifase). Questo sistema consente di risparmiare sul numero di componenti, ma presenta diversi svantaggi:

Non c'è isolamento galvanico tra la rete e la batteria. Per questo motivo, Zoe ha test di guasto HV e di terra molto rigorosi e non si caricherà se la resistenza terra-neutro è superiore a 100 ohm. Per eseguire questo test, Zoe inietta un impulso da 20 mA tra terra e neutro e potrebbe far scattare alcuni RCD.

The Zero-Ohm-Emulator

The Zero-Ohm-Emulator measures the ground loop
resistance and only interacts if the basic PE ground resistance
is well below all safety limits. It can sense when the Renault
query occurs, and will then for a very short time virtually
lower the ground loop resistance to satisfy the charging
requirements. Once charging starts, the Zero-Ohm-Emulator
can be taken out – or it can stay inserted.

Zero-Ohm-Emulator

Lo Zero-Ohm-Emulator misura la resistenza del ground loop e interagisce solo se la resistenza di terra PE di base è ben al di sotto di tutti i limiti di sicurezza. Può rilevare quando si verifica la richiesta Renault e quindi per un brevissimo periodo di tempo
abbasserà virtualmente la resistenza del ground loop per soddisfare i requisiti di carica. Una volta avviata la carica, lo Zero-Ohm-Emulator può essere estratto, oppure può rimanere inserito.