Technical Primer - Aurora
8.3
Input Overvoltage/Undervoltage is observed
The charger stops abnormally
General working principle
1. The allowable range of the input voltage of the charging facility is 165V to 269V per phase.
2. If the input voltage is lower than 165V per phase, an undervoltage fault is reported, and if it is
higher than 269V, an overvoltage fault is reported, and the charger will stop.
3. The onboard electricity meter in the charger will read the data such as the input voltage, and
the mainboard will read the data of the electricity meter once every 100ms.
4. When the overvoltage and undervoltage conditions last 6s, the fault is established, and the
charging will stop.
Troubleshooting tips
Check the input voltage of the charger. If the input voltage is too low or too high, we can advise
the customer to replace the more stable line to meet the working conditions of the charger.
8.4
Earth fault observed
The charger stops abnormally
General working principle
The grounding mechanism is to change the amplitude of the grounding circuit through the Y
capacitor charge and discharge, thereby determining the on-off of the optocoupler. After the op-
tocoupler T5 is turned on, a negative pulse is generated, and the MCU determines whether it is
grounded by detecting whether there is a negative pulse.
Troubleshooting tips
1. Check whether the charger has an independent grounding system. If it is not grounded sepa-
rately, please make rectification on site and add a separate ground.
2. Check whether the grounding stud is tight and whether there is corrosion. If the stud is loose
and the ground terminal/grounding area is corroded, please tighten the stud and remove the
corroded parts to ensure the reliability of grounding.
3. The voltage between neutral and ground should be kept below 10V. If the voltage exceeds 10V,
it is recommended to check whether the zero line is leaking or poorly grounded.
4. The cross-sectional area of the copper conductor used for grounding should be no less than 4
square millimeters. If the grounding copper wire used on site does not meet the above condi-
tions, please replace immediately.
5. If the ground wire on site is not in good contact, try pouring proper amount of salt water on
the grounding part, which can increase the conductivity.
Attention
In the end, the grounding resistance measurement value shall prevail, and the measured value
should not be greater than 4 Ohm. If the charging pile is installed in an underground garage or a
place where it cannot be separately grounded, when a ground fault occurs, it needs to coordinate
with the community property to rectify the public grounding row.
Wanbang Digital Energy Co.Ltd
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