Alarms and Events
5.3Possible Alarms
| Alarms | Description | Action |
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1. Peak current limiter active | Peak current limiter activated and | Check for blown fuses in | |
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| UPS switched to bypass operation. | installation |
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| System overload |
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2. Bypass power supply fault | Fault in redundant PSU for bypass. | Call for assistance | |
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| UPS still 100% able to operate in |
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| all modes. |
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3. Delta current limiter active | Input current limiter activated and | Check for overload. | |
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| UPS switched to bypass operation | If message is repetitive - |
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| call for assistance |
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4. Faulty fan | Blocked or faulty fan | Remove blocking or replace fan | |
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5. High DC warning | Switching off big output load | If alarm is repeated, reduce load | |
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| change |
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6. High DC shutdown | UPS fault | Call for assistance | |
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7. | Off button or emergency power | – | |
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| shut down activated |
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8. Synchronization error | UPS unable to synchronize with | Check if phase rotation of mains | |
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| input frequency | input voltage is correct. If OK, call |
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| for assistance |
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9. Inverter voltage error | Inverter average voltage outside | – | |
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| limits (normal message during |
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| system |
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10. | Parallel synchronization | Parallel UPS unable to | Check external parallel cables - |
| error | synchronize | call for assistance |
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11. | Inverter current limiter active | Inverter overload | Reduce UPS output load |
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12. | Overload. Load exceeding | UPS overload | Reduce UPS output load |
| 100% |
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13. | Second power supply fault | UPS fault | Call for assistance |
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| (only systems > 160kW) |
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14. | Internal power supply fault | UPS fault. Only bypass operation | Call for assistance |
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| possible |
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15. | Battery MCCB is off | Battery MCCB/fuse not closed or | Close MCCB / insert new fuse. If |
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| released | released again - |
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| call for assistance. |
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16. | **Q004 off** | Output switch position for UPS in | – |
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| parallel |
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17. | **Q003 off** | External bypass switch position | – |
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18. | **Q002 off** | UPS output switch position | – |
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19. | **Q001 off** | UPS input switch position | – |
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20. | High temperature of isolation | Temperature of isolation input/ | Check fan, check for airflow |
| transformer | output transformer, too high | obstructions, check for overload |
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21. High temperature of main static | Temperature of static input switch, | Check fan, check for airflow | |
| switch | too high | obstructions, check for overload |
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22. | High temperature of bypass | Temperature of static bypass | Check fan, check for airflow |
| static switch | switch, too high | obstructions, check for overload |
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26 | User Guide APC Silcon 480kW 400V UPS |
