| Error No. | Explanation | Corrective measures |
| 505 | Power frequency is too high. Power frequency fault detected by redundant monitoring. |
|
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- Error code - 103 - Grid voltage is too high.
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- Error Code - 203 - Grid Voltage is too high.
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- Error Code - 204 - Grid voltage too low
- Reconnecting the DC Side
- Error Code - 205 - Phase Drop Out
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- Error Code - 502 - Power frequency low
- Error Code - 503 - Power frequency too high
- Error Code - 504 - Power frequency too low
- Error Code - 506 - Disconnection from Grid
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