HV ELECTRICAL SYSTEM_MR & LR 54 2. Isolation Failure Issue during Fast Charging Procedure:- 1. Connect +ve terminal of Isolation tester to +ve terminal of vehicle charging inlet DC +ve. 2. Connect -ve terminal of Isolation tester to protective earth in vehicle charging inlet. 3. Check Isolation resistance on Isolation tester display.IR value should be more than 0.25 M Ohm and voltage should build 520 to 550 V. 4. Connect +ve terminal of Isolation tester to -ve terminal of vehicle charging inlet DC -ve. 5. Connect -ve terminal of Isolation tester to protective earth in vehicle charging inlet. 6. Check Isolation resistance on Isolation tester display.IR value should be more than 0.25 M Ohm and voltage should build 520 to 550 V. If Value is less than acceptable limit. 7. Remove 3IN1 side fast charging connector. 8. Check isolation of individual cable in between cable Shield & conductor for both +ve and -ve terminal. 9. If Isolation in cable found ok then cable is ok & if not ok then Isolation failure is in cable. 3. HV cables water entry check points for field testing :- 1. Visual check for cable and connectors damage. If Damage observed shall not be fitted. 2. Dry the connector using blower. 3. Check isolation measurement and continuity test.(IR value should be > 10MΩ @ 500V). 4. Jet spray the engine compartment area with water. (As per the pressure values specified for engine compartment washing). 5. Soak the vehicle for 2hr. 6. Repeat Step 3. 7. If IR values are OK then cable is healthy.
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