
Chapter 10 Service after Sales
Table
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| Fault description |
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| Reason |
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| Actions to be taken |
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| 1 |
| Ambient |
| Check the ventilation |
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| 2 |
| Environment | parameter | 1 |
| Environment parameter channel 1 |
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| abnormal |
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| has alarm |
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| 3 |
| Environment | parameter | 2 |
| Environment parameter channel 2 |
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| has alarm |
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| 4 |
| Environment | parameter | 3 |
| Environment parameter channel 3 |
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| has alarm |
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| 5 |
| Environment parameter |
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| 12V | environment | parameter |
| Check | the | devices | relating | to | the | |||
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| abnormal |
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| 6 |
| Rectifier input voltage |
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| abnormal |
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| exceeds normal operation range |
| amplitude of rectifier |
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| Rectifier input under- |
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| Check the input | |||||||||||
| 7 |
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| lower than 305V, but higher than |
| amplitude of rectifier |
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| 208V |
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| 8 |
| Rectifier’s input voltage |
| Rectifier | frequency | exceeds the |
| Check | the | rectifier’s | input | voltage | |||||
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| frequency is abnormal |
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| normal range |
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| frequency |
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| 9 |
| Input fuse blows |
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| Rectifier input fuse blows up |
| Notify the service dept for repairing |
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| 10 |
| Input transformer over |
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| Temperature of input transformer |
| Check | the | ambient temperature | and | |||||||
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| temperature |
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| is too high |
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| ventilation |
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| 11 |
| Input phase rotation |
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| Rectifier’s input phase rotation is |
| Notify the UPS service engineer, check | ||||||||||
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| Reverse |
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| reverse |
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| the wiring of rectifier input cables |
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| Bypass voltage or frequency is |
| Check the bypass voltage and | |||||||||
| 12 |
| Bypass unsynchronized |
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| out of normal range and inverter |
| frequency |
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| output is not synchronized with |
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| the bypass output. |
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| Bypass | voltage | or | frequency |
| Check the bypass voltage and | ||||||
| 13 |
| Bypass ratings exceed the |
| exceeds | the normal | range and |
| frequency |
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| normal range |
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| the bypass will not power the load |
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| Bypass over current |
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| If the | over current | time exceeds |
| Check | the | load, if it | is normal, | then | ||||
| 14 |
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| the limit, the UPS may shut down |
| restart the UPS |
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| timeout |
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| the bypass and the inverter. |
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| When the overload time is due in |
| Repair the bypass and reduce the load, | |||||||||
| 15 |
| Shutdown due to bypass |
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| inverter mode, if at this time the |
| and then restart the UPS. Note: Don’t | ||||||||||
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| fault |
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| bypass has fault, then the inverter |
| let the UPS in over load state for a long | ||||||||||
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| is shut down. |
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