Condition

 

 

 

 

 

 

Countermeasure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No recovery from utility

 

 

・ 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

 

 

power source failure.

 

 

normal operation,

the same operation as for a utility power source failure

 

 

Utility power source

 

 

will be triggered.) See §9.1 “UPS Startup (Normal Operation)”.

 

 

failure occurs frequently.

 

 

・ Verify that input voltage and input frequency are within the rated limits.

 

 

 

 

 

See §15.3 “Specifications”.

 

 

 

 

 

 

 

 

・ 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.”

 

 

UPS is operated in the

 

 

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

 

 

“Double Conversion” mode

 

 

 

 

 

 

improves to cleanness.

 

 

 

 

 

though set UPS in the

 

 

 

 

 

 

 

 

 

In this case, it is necessary to reduce the load of UPS.

 

 

Economy” mode.

 

 

 

 

 

 

(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.

 

 

 

 

 

 

 

 

 

 

 

・ 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)”.

 

 

UPS does not switch from

 

 

・ 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

 

 

bypass operation to

 

 

2.5 seconds, and switches back to bypass power supply if the overload

 

 

normal operation.

 

 

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.

 

 

 

 

 

Cannot perform battery

 

 

② Bypass power supply is active.

 

 

test.

 

 

③ Input voltage or input frequency is out of range.

 

 

 

 

 

④ Shutdown under remote control is in progress.

 

 

 

 

 

⑤ Equipment is defective.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

・ Verify that item ⑤ “PC Interface mode” in §10.1 “Setup Menu Item List”

 

 

Serial communication

 

 

is set to “Workstation”. Check the serial connection. See §5.3 “External

 

 

 

 

Interfaces”.

 

 

 

 

 

 

 

 

fails.

 

 

 

 

 

 

 

 

 

 

 

 

・ 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

 

 

・ 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

 

 

does not occur after

 

 

 

 

 

 

item is set to “OFF”.

 

 

 

 

 

shutdown due to battery

 

 

 

 

 

 

 

 

 

If this item is set to “30%”, “50%”, or “80%”, the UPS does not start until

 

 

exhaustion following

 

 

 

 

 

 

the batteries are charged to the specified level.

 

 

power outage.

 

 

 

 

 

 

The factory default setting of this item is “Auto”.

 

 

 

 

 

 

 

Green DOUBLE

 

 

・ The UPS is switching frequently between operating modes because the

 

 

CONVERSION and green

 

 

utility power is unstable. Set the UPS operating mode to “Double

 

 

ECONOMY light and go

 

 

Conversion Mode”. For details, see item ① “UPS operation mode” in §10.1

 

 

off frequently at irregular

 

 

“Setup Menu Item List”.

 

 

 

 

 

intervals.

 

 

The factory default setting of this item is “Auto”.

 

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