Alarms and Events
| Alarms | Description | Action |
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23. | Main inverter failure | Temperature of main inverter, too | Check fan, check for airflow |
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| high or inverter fuse blown | obstructions, check for overload, |
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| check fuse |
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24. | High temperature of delta | Temperature of delta inverter, too | Check fan, check for airflow |
| inverter | high | obstructions, check for overload |
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25. | Low DC shutdown | Battery discharged to minimum | Ensure battery recharging |
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| permissible level |
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26. | Low DC warning | Battery nearly discharged | Save your data now |
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27. | Mains momentarily outside | Short disturbances on mains | – |
| tolerance | supply (1 ms transients) |
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28. | Mains outside tolerance | Mains input voltage R.M.S. value | – |
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| outside tolerance |
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29. | Mains frequency outside | Mains input frequency outside | – |
| tolerance | tolerance |
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30. | Bypass momentarily outside | Short disturbances on bypass | – |
| tolerance | voltage |
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31. | Bypass outside tolerance | Bypass input voltage outside | – |
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| tolerance |
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32. | Bypass frequency outside | Bypass input frequency outside | – |
| tolerance | tolerance |
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33. | Output momentarily outside | Short disturbance on output | If message reappears - |
| tolerance | voltage (inrush current) | call for assistance |
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34. | Output outside tolerance | Output voltage outside tolerance | Call for assistance |
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35. | Output frequency outside | Output frequency outside | Call for assistance |
| tolerance | tolerance |
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36. | High battery temperature | Battery ambient temperature too | Check system ambient |
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| high | temperature, check fan, check for |
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| airflow obstructions |
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37. | Battery weak | Battery capacity below 75% or | Test battery capacity |
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| battery MCCB/fuse switched off |
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38. | Battery defective | Insufficient battery capacity or | Call for assistance |
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| battery MCCB/fuse switched off |
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39. | System locked in operation | UPS has made 10 attempts within | Unlock. |
| mode | 1 minute to switch from bypass to | If message reappears - |
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| battery operation, or “High DC | call for assistance |
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| warning” has appeared |
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| times within 1 minute |
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40. | RAM1 memory write error | UPS fault | Call for assistance |
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41. | Memory write error | UPS fault | Call for assistance |
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42. | Communication to VQ bypass | UPS fault | Call for assistance |
| lost |
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43. | Communication to VQ output | UPS fault | Call for assistance |
| lost |
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44. | Communication to DMU lost | UPS fault | Call for assistance |
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45. | Communication to controller | UPS fault. | Call for assistance |
| lost | Display will show invalid UPS data |
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User Guide APC Silcon 480kW 400/415V UPS | 27 |