Troubleshooting
44
UPS Status
LED Status Countermeasure
Alarm buzzer does not sound.
-
• The alarm buzzer sound may be set to “OFF”.
Check the setting of “Buzzer Sound” in the user setting menu.
See §3.7 “Setting Buzzer Sound” in the
User Settings Guide
.
Battery power supply
continues.
Power supply switches to
battery power frequently.
Orange BACK UP
lit
• Check whether MAIN MCCB on the back panel of the UPS is set to
“ON”. (If MAIN MCCB is set to the “OFF” during normal operation,
the same operation as for a utility power source failure will be
triggered.).
• Verify that input voltage and input frequency are within the rated
limits. See §19.4 “Specifications”.
UPS does not switch from
bypass power supply to UPS
power supply.
Green OUTPUT
blinking,
Green ON/OFF
blinking
• Check Forced Bypass is set to “Inverter”. This switch is located
inside the front panel of the unit. Remove the front panel to check.
See §6.1 “Battery Connector Connection”, step⑥.
• When “Overload Recovery Operation” in the user setting menu is set to
“Auto return”: The UPS switches to UPS power supply every 2.5
seconds, and switches back to bypass power supply if the overload
condition still persists. This cycle is repeated. See §3.9 “Setting
Overload Recovery Operation” in the
User Settings Guide
.
• When “Overload Recovery Operation” in the user setting menu 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 UPS power
supply and bypass power supply. See §3.9 “Setting Overload Recovery
Operation” in the
User Settings Guide
.
Cannot perform battery test.
-
• 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 UPS is defective.
When using the power
management software,
serial communication fails.
-
• Check that “Interface” in the user setting menu is set to “Workstation”.
See §3.4 “Setting PC Interface” in the
User Settings Guide,
and §5.3
“External Interfaces”. The factory default setting is “Workstation”.
• Check the setting of “Serial Baud Rate” in the user setting menu. The
factory default setting is “9600”. Select the same setting value as the
setting of power management software.
Automatic UPS restart does
not occur after shutdown
due to battery exhaustion
following power outage.
-
• Check the setting of “UPS Operation Upon Power Recovery” in the user
setting menu. Automatic UPS 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”. See §3.6 “Setting UPS
Operation Upon Power Recovery” in the
User Settings Guide
.
The UPS does not automatically
start at the time set for
scheduled operation in the power
management software.
-
• If “When power failure recovered, automatically start the UPS” of the
"6.4 (4) Configuring the UPS control conditions" items described in the
user guide of the power management software is selected and the value
“10 to 90” is set for the specified value (%), the UPS will not start even
at a scheduled start time if the battery is not charged to the specified
value.
When scheduling operation for the UPS, set this specified value (%) to
"0". For details, refer to “6.4 Setting the Shutdown Conditions” in the
User Guide of the power management software.
“Red ALARM LED” is lit.
-
• An alarm condition or error has occurred.
Contact your supplier.
When the troubles cannot be resolved even if you perform the countermeasures above, or
when other failure occurs in the UPS, contact your supplier.
Note
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