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Condition
Countermeasure
No recovery from utility
power source failure.
Utility power source
failure occurs frequently.
・
Check whether MAIN MCCB on the back panel of the UPS is in the
“ON” position. (If MAIN MCCB 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”.
UPS is operated in the
“Double Conversion” mode
though set UPS in the
Economy” mode.
・
UPS automatically shifts to a double conversion when the operation mode
of UPS is set by economy by the following conditions.
“When UPS is operated by about ratings (The display of “LOAD
LEVEL(%)” shows the state of about 75 or more.), and the quality of the
input power supply worsens continuously or momentary.”
After the mode of UPS has shifted to "Double Conversion" once,.the mode
does not return to "Economy" even if the quality of the input power
improves to cleanness.
In this case, it is necessary to reduce the load of UPS.
(The display of "LOAD LEVEL(%)" is roughly a state below "75".)
UPS is not abnormal . However, it is necessary to reduce the load of UPS to
return the mode to "Economy".
Moreover, it is necessary to adjust the load so that the display of "LOAD
LEVEL(%)" should not exceed "75" to operate UPS only in the economy
mode.
UPS does not switch from
bypass operation to
normal operation.
・
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.
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
Equipment is defective.
Serial communication
fails.
・
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”.
Automatic inverter restart
does not occur after
shutdown due to battery
exhaustion following
power outage.
・
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”.
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 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”.