Troubleshooting
41
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 §3.8 “Setting Buzzer Sound” in the
User Settings Guide
.
Battery power supply
continues.
Power supply switches to
battery power frequently.
Green INPUT
blinking
Check whether
MAIN SW
on the back panel of the UPS is set to
“ON”. (If
MAIN SW
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 §17.4 “Specifications”.
UPS does not switch from
bypass power supply to UPS
power supply.
Green OUTPUT
blinking,
Green
INV.ON/STANDBY
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 §7.1 “Battery Connector Connection”, step 5
.
If
Forced Bypass
is set to “Bypass”, set it to “Inverter”, then press
for at least 1 second.
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 §3.10 “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 §3.10 “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.
⑥
When load factor is less than 20% in the economy mode operation
or the active filter mode operation.
When using the power
management software,
serial communication fails.
-
Check that “Interface” in the user setting menu is set to
“Workstation”.
See §3.5 “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”. See §3.6 “Setting Serial
Baud Rate” in the
User Setting Guide
. 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 §3.7 “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 “ 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 “Setting the Shutdown Conditions” in the
User Guide of the power
management software.
“Green
DOUBLE CONVERSION”
and “Green ECONOMY light
and go off frequently at
irregular intervals.
-
The UPS is switching frequently between operating modes because
the utility power is unstable. Set the UPS operating mode to “Double
Conversion”. For details, see §3.1 “Setting UPS Operation Mode” in
the
User Settings Guide
. The factory default setting of this item is
“Auto”.
“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
