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Troubleshooting for inverters
In order to facilitate customers to inspect inverters on their own, in this article we will list common
faults and fault analysis from the aspect of exterior indicators. Exterior indicators include a green light,
a red light and a cooling fan. In the following we will analyze these faults from three indications.
Table 1 Illustration of exterior indications
Green light Red light Cooling fan
Work normally on off on
Over-high temperature off on on
breakdown off on off
(1) In the case of no-load, common faults are:
A. When the power is turned on, both the green light and the red light are not on. The cooling
fan doesn’t run.
Analysis:
1) The input power may not be connected or abnormal;
2) The power cord of the equipment may be connected reversedly.
3) The switch is not on.
Solution:
1) Check whether the input power supply can work normally;
2) Check whether the power cord of the equipment is connected reversedly.
3) Check whether the switch is on.
B. After the power is turned on, the green light is off, the red light is on and the fan doesn’t run.
Analysis:
1) There may be a short circuit inside the inverter. The red light is on, which indicates that the inverter
may switch to be in the state of overcurrent protection;
2) The input voltage may be insufficient or too high so that the inverter switches to be in the state of
under voltage or over voltage protection.
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