www.megger.com 5CAR CHARGERS FOR ELECTRIC VEHICLES:A STEP-BY-STEP GUIDE TO AUTOMATED TESTING 5WWW.MEGGER.COM Part 1 – Car charger supply connection inspection and testing ■Visually inspect and test the installation up to the point of connection of the car charger. The electrical installation up to this point must comply with local regulations, and testing should be carried out in the same way as any other electrical circuit. Essential tests are loop impedance, voltage drop, continuity of bonding conductor, cable insulation and polarity (phase sequence for three-phase chargers) and RCD testing.Part 2 – Car charger test adaptor connection ■Visually inspect the car charger. Look particularly for physical damage to connectors and cables. Replace or repair damaged or defective items before proceeding. 1 ■Ensure that the EVX adaptor is correctly attached to the MFT-X1 tester. The adaptor plugs directly into the tester – no interconnecting cables are needed. 2 ■Connect the EVX adaptor plug to the car charger. The EVX is now ready to communicate with the charger. 3 ■Select the voltage setting on the left rotary dial of the MFT-X1. This will switch on the EVX and the charger. ■Wait a few seconds until the LED on the EVX stops flashing yellow. Note: If the LED continues to flash yellow for more than 30 seconds, this indicates that the EVX is not communicating with the M FT-X1. Refer to Section 5.2 of the EVX user guide for more information. ■The EVX will now send a CP state sequence of A, B, and C to the car charger. This sequence is automatic and shown at the bottom of the MFT-X1 display as the EVSE state. 4 ■The car charger should lock the connector in place and the MFT-X1 will display the single- or three-phase voltages at the charger output. For three-phase chargers, the phase sequence will also be displayed. The display should indicate a C2 state. Note: Some car chargers have a start-up delay of up to five minutes. This is usually indicated by no voltage on the instrument’s display and the status code C1 displayed. Most of these chargers have a ‘start charging now’ button. Pressing this should immediately switch the charger into charging mode (State C2).1234
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