Sermatec SMT-5K-TL-LV, User Manual, Page: 34 / 46

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5.3 Trouble Shooting
Table 5-3
Error message Fault cause Solutions
Grid Phase Lock Failure
Abnormal frequency
or voltage of the grid
1. Shut down and turn on when
the power grid is normal.
2. If step 1 does not help, please
contact Sermatec Service team.
AC Output Short Circuit Error
AC backup or AC
Grid port have short
circuit issue
1. Shut down inverter and check the
circuit, restart after correction.
2. If step 1 does not help, please
contact Sermatec Service team.
Output Current Leakage Error Abnormal electrical
connection
1. Shut down inverter and check the
AC output circuit, ensure PE is
grounded well,restart after
correction.
2. If step 1 does not help, please
contact Sermatec Service team.
The leakage current
of the load exceeds
the standard.
Make sure the leakage current of
load meets the standard(less than
230mA).
AC Output Overload Warning
The output power
exceeds the upper
limit of output
power.
1. Please check backup load power
to see if it is overloaded;
A. For 10K inverter, none-inductive
load cannot be more than 10kW
(each phase is not more than
3.3kW).
The inductive load cannot be more
than 3.3kW (each phase is not more
than 1.1kW).
B. For 5K inverter, none-inductive
load cannot be more than 5kW, the
inductive load cannot be more than
1.7kW.
Inverter Soft Start Up Failure
Inverter AC Voltage
1. Occasional failures can