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9
4. TROUBLESHOOTING
Trouble Name
Possible Cause
Troubleshoot Suggestions
AC over voltage
AC input voltage is
higher than standard.
1. If instantaneous voltage is over 264Vac
，
wait for
the power grid to recover normally.
2. Check and analyse background monitoring data. If
the voltage in this area is over-voltage for a long
time, please increase the input over-voltage
protection value by the configuration software;
max. value is up to 300Vac.
3. If the problem cannot be eliminated, please
contact us.
AC under voltage
AC input voltage is
lower than standard.
1. If instantaneous voltage is under 140Vac, wait for
the power grid to recover to normal.
2. Check and analyse background monitoring data. If
the voltage in this area is under-voltage for a long
time, please reduce the input under-voltage
protection value by the configuration software;
min. value is 140Vac.
3. If the problem cannot be eliminated, please
contact us.
AC over current
AC input current is
higher than standard.
1. Immediately disconnect the leakage/over-current
protection circuit breaker of the distribution box.
2. Check whether there is low impedance or short
circuit between two lines of output line of AC EV
charging station.
3. After the above problems are eliminated, power on
again. If the problem still cannot be eliminated,
please contact us.
AC over frequency
AC input frequency is
higher than standard.
1. If instantaneous frequency exceeds 55Hz, wait for
the power grid to recover to normal.
2. Check the input voltage frequency in the
background monitoring data. If it is too high for a
long time, please contact the power supply
department for handling.
AC under frequency
AC input frequency is
lower than standard.
1. If the instantaneous frequency is less than 45Hz,
wait for the power grid to recover to normal.
2. Check the input voltage frequency in the
background monitoring data. If it is too lower for a
long time, please reduce the protection frequency;
value, min. value up to 40Hz.
3. If the problem cannot be eliminated, please
contact us.
