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| Alarms and Events |
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| Table 5: Possible Alarms |
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| Mains is out of | The utility (AC input) voltage is too | If possible, restore AC input |
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| tolerance (This | high or too low, so the unit | power to the UPS. If AC input is |
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| alarm occurs | transfers to battery operation. If | available to the UPS, ask an |
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| during a power | AC input returns to normal, the | electrician to make sure that 1) |
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| outage) | unit transfers back to normal | the correct input voltage is |
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| operation. If not, the unit continues | available to the UPS, and 2) this |
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| to run on battery until the “Low DC | voltage is within a range the UPS |
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| shutdown” alarm occurs. Then, if | will accept. |
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| bypass voltage is within the range |
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| programmed into the UPS, the unit |
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| transfers to bypass. If not, the unit |
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| transfers to |
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| supply output voltage. |
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| OFF Button | A user pushed the red “Off” button | Restart the unit by pressing the |
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| Pushed (If the | or activated an emergency power | green button inside the door. If |
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| alarm was | off shutdown. The unit switches to | the unit will not restart, the |
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| caused by the | alarm was caused by an |
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| Off button, it is | output voltage. | emergency power off (EPO) |
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| in the events |
| shutdown. Find out why this |
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| log) |
| shutdown was activated and |
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| make sure the emergency |
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| situation has passed; then, |
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| restart the unit by deactivating |
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| the emergency power off |
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| shutdown. |
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| Output freq. is | The output frequency is too high, | Ask an electrician to make sure |
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| out of tolerance | low, or unstable (out of tolerance). | that the correct input frequency is |
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| The unit transfers to battery | being supplied to the UPS. Then, |
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| operation and runs on battery until | call APC Global Service. |
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| the “Low DC shutdown” alarm |
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| occurs. Then, the unit transfers to |
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| bypass if bypass is within |
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| tolerance. If not, the unit transfers |
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| to |
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| output voltage. |
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| Output is | The output voltage was | If other alarms are also active, |
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| moment. out of | momentarily too high or too low | troubleshoot these alarms first. If |
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| tolerance | (out of tolerance). If bypass is | this is the only alarm, call APC |
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| within tolerance, the unit transfers | Global Service. |
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| to static bypass operation. If not, |
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| the unit transfers to |
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| does not supply output voltage. |
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18 | User Guide APC BC300 Series 40kW 208/450/480V UPS |
