Orion BMS 2 Chademo Troubles
Posted: Fri Jul 15, 2022 4:19 am
I'm finally adding Chademo charging to my '78 MG Midget that has a forklift motor and a 24kWh (about 14kWh usable today) LEAF pack.
One thing to note first off is that my pack is only 32s or 134V fully charged, ~100V totally dead. I'm aware that many Chademo stations only support 200-500V, but the ones near by me are mostly ABB Terra 53 50kW that say 50-500V 125A on their nameplate. Not sure if anyone else has experience with these particular chargers in low-voltage conversions like mine, but based on the nameplate it should work fine...
I've probed all the Chademo signals (names here are relative to the Orion BMS Chademo Integration doc and basically I see:
- Orion pin 26 (Multi Purpose Enable) starts out pulled to ground because the BMS is happy.
- Start/Stop 1 goes high when I hit start on the station, closing the contactor control relay
- Charger and car do a bunch of CAN communication (I have logs captured from the Orion BMS)
- Several seconds later, the Charging Enable pin (pin 4 on Chademo/pin 6 on Orion) is still not pulled down by the Orion and the charger times out and stops giving 12V on the Start/Stop 1 pin.
On the CANbus comms, the big red flag I'm seeing is the 0x109 message has the EVSE_STATUS_INCOMPATIBLE bit thrown. Is the nameplate claiming the charger works down to 50V a complete lie???
Any help debugging this is much appreciated. I'm really hoping I'm doing something wrong here and it isn't that the stations near me just won't support such a low voltage.
Other useful info:
* Chademo signalling pinout and description
* https://openinverter.org/forum/viewtopic.php?t=1472
* https://github.com/mdrobnak/can-dc-fc-r ... ms_loop.rs
* https://github.com/mdrobnak/can-dc-fc-r ... cess_cd.rs
One thing to note first off is that my pack is only 32s or 134V fully charged, ~100V totally dead. I'm aware that many Chademo stations only support 200-500V, but the ones near by me are mostly ABB Terra 53 50kW that say 50-500V 125A on their nameplate. Not sure if anyone else has experience with these particular chargers in low-voltage conversions like mine, but based on the nameplate it should work fine...
I've probed all the Chademo signals (names here are relative to the Orion BMS Chademo Integration doc and basically I see:
- Orion pin 26 (Multi Purpose Enable) starts out pulled to ground because the BMS is happy.
- Start/Stop 1 goes high when I hit start on the station, closing the contactor control relay
- Charger and car do a bunch of CAN communication (I have logs captured from the Orion BMS)
- Several seconds later, the Charging Enable pin (pin 4 on Chademo/pin 6 on Orion) is still not pulled down by the Orion and the charger times out and stops giving 12V on the Start/Stop 1 pin.
On the CANbus comms, the big red flag I'm seeing is the 0x109 message has the EVSE_STATUS_INCOMPATIBLE bit thrown. Is the nameplate claiming the charger works down to 50V a complete lie???
Any help debugging this is much appreciated. I'm really hoping I'm doing something wrong here and it isn't that the stations near me just won't support such a low voltage.
Other useful info:
* Chademo signalling pinout and description
* https://openinverter.org/forum/viewtopic.php?t=1472
* https://github.com/mdrobnak/can-dc-fc-r ... ms_loop.rs
* https://github.com/mdrobnak/can-dc-fc-r ... cess_cd.rs