So far I wasn’t able to fast charge my test pack. First I thought it had to do with fact that the JLD505 wiring was somewhat different than the schematic in the ChaDeMo Kit Manual because it has been used in a Zero motorcycle. The logging showed that the High voltage contactor was closed and that the EVSE supplied a high voltage. But after a few seconds the voltage rose to the max battery voltage set in the JLD505 and the EVSE stopped the charging process. Based on the ChaDeMo charging sequence flowchart I came to the conclusion that the JLD505 is working fine. But the test pack is probably causing problems. The test pack has old batteries from an UPS and they weren’t designed for fast charging.