| Error No. | Explanation | Corrective measures |
| 504 | Power frequency is too low. Power frequency fault detected by redundant monitoring. |
|
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- Error Code - 204 - Grid voltage too low
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- Error Code - 502 - Power frequency low
- Error Code - 503 - Power frequency too high
- Error Code - 505 - Power Frequency is too high
- Error Code - 506 - Disconnection from Grid
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