| Condition |
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| Countermeasure |
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| No recovery from utility |
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| ・ Check whether | MAIN SW | on the back panel of the UPS is in the “ON” |
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| position. (If | MAIN SW | is set to the “OFF” position during normal |
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| power source failure. |
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| operation, the same operation as for a utility power source failure will be |
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| Utility power source |
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| triggered.) See §9.1 “UPS Startup (Normal Operation)”. |
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| failure occurs frequently. |
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| ・ Verify that input voltage and input frequency are within the rated limits. |
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| See §15.3 “Specifications”. |
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| ・ Check whether the | Forced Bypass | switch is set to “Inverter”. This |
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| switch is located inside the front panel of the unit. Remove the front panel |
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| to check. |
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| See 14 “Maintenance Bypass Power Supply (Option)”. |
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| UPS does not switch from |
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| ・ When item ⑩ “Overload recovery operation” in §10.1 “Setup Menu Item |
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| List” is set to “Auto return”: The UPS switches to inverter operation every |
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| bypass operation to |
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| 2.5 seconds, and switches back to bypass power supply if the overload |
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| normal operation. |
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| condition still persists. This cycle is repeated. |
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| ・ When item ⑩ “Overload recovery operation” in §10.1 “Setup Menu Item |
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| List” is set to “Bypass”: If the utility power voltage is low and the load |
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| current is below the overload detection threshold when the UPS switches |
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| to bypass power supply, the UPS continues to switch between inverter |
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| power supply and bypass power supply. |
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| ・ A battery test cannot be performed when: |
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| ① Inverter is stopped. |
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| ② Bypass power supply is active. |
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| Cannot perform battery |
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| ③ Input voltage or input frequency is out of range. |
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| test. |
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| ④ Shutdown under remote control is in progress. |
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| ⑤ Equipment is defective. |
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| ⑥ When the LODE LEVEL indicators are all off (load factor is less than |
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| 20%) in the economy mode operation or the active filter mode operation. |
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| ・ Verify that item ⑤ “PC Interface mode” in §10.1 “Setup Menu Item List” |
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| Serial communication |
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| is set to “Workstation”. Check the serial connection. See §5.3 “External |
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| Interfaces”. |
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| fails. |
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| ・ Check the setting of item ⑥ “Serial baud rate” in §10.1 “Setup Menu Item |
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| List”. The factory default setting of this item is “9600”. |
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| Automatic inverter restart |
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| ・ Check the setting of item ⑦ “Restart time (battery charge rate)” in §10.1 |
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| “Setup Menu Item List”. Automatic inverter restart does not occur if this |
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| does not occur after |
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| item is set to “OFF”. |
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| shutdown due to battery |
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| If this item is set to “30%”, “50%”, or “80%”, the UPS does not start until |
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| exhaustion following |
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| the batteries are charged to the specified level. |
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| power outage. |
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| The factory default setting of this item is “Auto”. |
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| Green DOUBLE |
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| ・ The UPS is switching frequently between operating modes because the |
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| CONVERSION and green |
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| utility power is unstable. Set the UPS operating mode to “Double |
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| ECONOMY light and go |
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| Conversion Mode”. For details, see item ① “UPS operation mode” in §10.1 |
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| off frequently at irregular |
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| “Setup Menu Item List”. |
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| intervals. |
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| The factory default setting of this item is “Auto”. |
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