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12. Troubleshooting
If a problem occurs, check the condition of the equipment and perform countermeasures as listed in the table below.
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CAUTION
・ Internal maintenance and inspection should be performed only by technically qualified personnel. Electric shock, injury, burning, fuming or fire could otherwise result.
・ Before beginning inspection, shut down the UPS completely, and remove the input power. Failure to do so may result in an electric shock.
・ While the batteries are connected to the equipment, hazardous voltage is present. Never touch any parts with your hand. Doing so may result in an electric shock.
Condition Countermeasure
No power supplied to output.
・ Check whether the input wiring has been performed correctly. Refer to §7
“Wiring”.
・ Verify that the input voltage and input frequency are within the rated range. Refer to §15.4 “Specifications”.
・ Check that MAIN SW is set to “ON”.
・
must be pressed for at least 1 second.
See §9.1 “UPS Startup (Normal Operation)” for the correct startup procedure.
・ The bypass fuse may be blown. See §11.7 “Bypass Fuse Exchange”.
Output does not stop.
Output stops during operation
Output stops during a power failure.
Alarm buzzer sounds.
Alarm buzzer does not sound.
Red ALARM LED is lit.
・ must be pressed for at least 1 second.
See §9.4 “UPS Shutdown (Daily)” for the correct shutdown procedure.
However, bypass power supply continues if bypass operation was started by changing over with the forced bypass switch, overload, or failure.
・ Check the setting of item ⑪ “Inverter stop operation” in §10.1 “Setup
Menu Item List”. It may be set to “Bypass”. The factory default setting is
“OFF”.
・ Check the setting of item ⑨ “ switch response time” in §10.1
“Setup Menu Item List” . It may be set to “3 seconds” or “Special operation”. The factory default setting is “1 second”.
・ Check whether the bypass fuse on the back panel is blown. It may have been blown by an overload or short circuit.
Check the total load and the possibility of a short circuit.
When the total load is high, reduce the number of load devices connected to the UPS.
See §11.7 “Bypass Fuse Exchange”.
・ Check whether the batteries have reached their replacement interval.
The battery service life will differ depending on the ambient temperature.
Replacing the batteries early is recommended.
・ The alarm buzzer sounds when an error, abnormal state, or alarm condition is detected in the UPS. See §13 “Alarm Sounds”.
・ The alarm buzzer sound may be set to “OFF”.
Check the setting of item ⑧ “Buzzer sound” in §10.1 “Setup Menu Item
List”.
・ A non-fatal alarm condition or error has occurred.
Contact your supplier.
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Condition
No recovery from utility power source failure.
Utility power source failure occurs frequently.
UPS does not switch from bypass operation to normal operation.
Cannot perform battery test.
Countermeasure
・ Check whether MAIN SW on the back panel of the UPS is in the “ON” position. (If MAIN SW is set to the “OFF” position during normal operation, the same operation as for a utility power source failure will be triggered.) See §9.1 “UPS Startup (Normal Operation)”.
・ Verify that input voltage and input frequency are within the rated limits.
See §15.3 “Specifications”.
・ Check whether the Forced Bypass switch is set to “Inverter”. This switch is located inside the front panel of the unit. Remove the front panel to check.
See 14 “Maintenance Bypass Power Supply (Option)”.
・ When item ⑩ “Overload recovery operation” in §10.1 “Setup Menu Item
List” is set to “Auto return”: The UPS switches to inverter operation every
2.5 seconds, and switches back to bypass power supply if the overload condition still persists. This cycle is repeated.
・ When item ⑩ “Overload recovery operation” in §10.1 “Setup Menu Item
List” is set to “Bypass”: If the utility power voltage is low and the load current is below the overload detection threshold when the UPS switches to bypass power supply, the UPS continues to switch between inverter power supply and bypass power supply.
・ A battery test cannot be performed when:
① Inverter is stopped.
② Bypass power supply is active.
③ Input voltage or input frequency is out of range.
④ Shutdown under remote control is in progress.
⑤ Equipment is defective.
⑥ When the LODE LEVEL indicators are all off (load factor is less than
20%) in the economy mode operation or the active filter mode operation.
Serial communication fails.
Automatic inverter restart does not occur after shutdown due to battery exhaustion following power outage.
Green DOUBLE
CONVERSION and green
ECONOMY light and go off frequently at irregular intervals.
・ Verify that item ⑤ “PC Interface mode” in §10.1 “Setup Menu Item List” is set to “Workstation”. Check the serial connection. See §5.3 “External
Interfaces”.
・ Check the setting of item ⑥ “Serial baud rate” in §10.1 “Setup Menu Item
List”. The factory default setting of this item is “9600”.
・ Check the setting of item ⑦ “Restart time (battery charge rate)” in §10.1
“Setup Menu Item List”. Automatic inverter restart does not occur if this item is set to “OFF”.
If this item is set to “30%”, “50%”, or “80%”, the UPS does not start until the batteries are charged to the specified level.
The factory default setting of this item is “Auto”.
・ The UPS is switching frequently between operating modes because the utility power is unstable. Set the UPS operating mode to “Double
Conversion Mode”. For details, see item ① “UPS operation mode” in §10.1
“Setup Menu Item List”.
The factory default setting of this item is “Auto”.
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