Chapter 7 Troubleshooting
| No.1 |
| Fault description |
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| Reason |
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| Actions to be taken | ||||||
| 30 |
| Rectifier fan fails |
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| Rectifier fan is abnormal |
| Replace the fan in time and the UPS can | ||||||||
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| 31 |
| Rectifier contactor |
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| Rectifier contactor can’t be closed or |
| Notify the service dept for repairing | ||||||||
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| abnormal |
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| opened normally |
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| 32 |
| Auxiliary contactor |
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| Auxiliary | contactor abnormal | can’t |
| Notify the service dept for repairing | ||||||
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| abnormal |
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| be closed or opened normally |
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| 33 |
| Auxiliary power supply |
| At least one auxiliary power supply |
| Notify the service dept for repairing | |||||||||
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| The IGBT of rectifier has over |
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| 34 |
| Rectifier over current |
| current resulting in the shut down of |
| Notify the service dept for repairing | |||||||||
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| rectifier. |
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| Inverter | is | asynchronous | with |
| Check if the bypass is normal. The fault | ||||
| 35 |
| Inverter asynchronous |
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| alarm | stops automatically | after the | ||||||||
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| bypass |
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| bypass recovers normal |
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| 36 |
| Inverter fails |
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| Inverter output fails and shuts down |
| Notify the service dept for repairing | ||||||||
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| 137 |
| Inverter | heatsink | over |
| Inverter heatsink temperature is too |
| The UPS can | recover | automatically. | |||||
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| high |
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| Check the environment and ventilation | ||||||
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| 38 |
| Inverter fan fails |
| Inverter fan is abnormal |
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| Replace the fan in time and the UPS can | ||||||||
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| recover automatically |
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| 39 |
| Inverter SCR fails |
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| Inverter SCR fails and has no |
| Notify the service dept for repairing | ||||||||
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| output. UPS shuts down |
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| 40 |
| Auxiliary power supply |
| At least one auxiliary power supply |
| Notify the service dept for repairing | |||||||||
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| 2 fails |
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| fails |
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| The IGBT of inverter has over |
| Restart the inverter, if the fault can’t be | |||||||
| 41 |
| Inverter over current |
| current resulting in the shut down of |
| cleared, notify the service dept for | |||||||||
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| inverter. |
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| repairing. |
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| Shutdown due to low |
| DC bus voltage is too low resulting |
| Check | whether | there is | fault | in rectifier | |||||
| 42 |
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| in the shutdown of inverter |
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| bus voltage |
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| occurs. Restart after clearing the fault. | ||||||
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| 43 |
| Output transformer |
| Output transformer temperature is |
| Auto recovery, ambient and ventilation of | |||||||||
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| over temperature |
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| too high |
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| UPS should be checked. |
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| 44 |
| overload |
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| Load is too heavy |
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| Disconnect unnecessary load and ensure | |||||||
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| the safety. |
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| 45 |
| Overload exceeds |
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| Over load occurs in inverter mode, |
| If the load decreases after 5 minutes, the | ||||||||
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| transfers to bypass mode |
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| system will back to inverter mode | ||||||||
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| 46 |
| Output fuse blows up |
| Output fuse blows |
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| Notify the service dept for repairing | ||||||||
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| 47 |
| AC | output | over |
| Output over voltage |
| Notify the service dept for repairing | |||||||
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| voltage |
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| 48 |
| Output surge current |
| Surge current | occurs in bypass |
| Avoid applying big load abruptly and short | ||||||||
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85
