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4. Operation

4.4.3 Connecting Devices to UPS

1) After the UPS has been turned on, devices may be connected and powered on one at a time. The UPS system’s LCD panel will display

the total load level.

2) When connecting devices with inductive loads (such as a printer), the in-rush current should be calculated carefully to confirm it meets

the capacity of the UPS. Power consumption of such loads may cause an overload.

3) If the UPS is overloaded, the alarm will beep twice every second.
4) In case of overload, remove non-essential devices immediately. To prevent overload and ensure system safety, it is recommended to

have the total load connected to the UPS at no more than 80% of its nominal power capacity.

5) If the overload time is higher than the acceptable time listed in On-line Mode, the UPS will automatically transfer to Bypass Mode. After

the overload is removed, the UPS will return to On-line Mode. If the overload time is higher than the acceptable time listed in Battery

Mode, the UPS will go to fault status. At this time, if the bypass is enabled, the UPS will supply power to the load via bypass. If the
bypass function is disabled or the input power is not within acceptable bypass range, it will directly cut off output.

4.4.4 Charging the Batteries

1) After the UPS is connected to utility power, the charger will automatically charge the batteries (except when in Battery Mode, during a

battery self-test, overload or when the batteries are fully charged).

2) It is recommended to charge the batteries at least 10 hours prior to use. Otherwise, the backup time may be shorter than expected.

4.4.5 Battery Mode Operation

1) The default value is 990 minutes, or 16.5 hours. The UPS will automatically shut down to protect the battery after discharging for

16.5 hours. This battery discharge protection can be enabled or disabled through the LCD control panel (refer to

section 4.7

for more

information).

4.4.6 Testing the Batteries

1) To check the battery status when the UPS is in On-line Mode/Freq. Converter Mode, press the “Test” button for the UPS to perform a

battery self-test.

2) Users may set battery self-tests through the network management card.

4.4.7 Turning Off the UPS with Utility Power Present in On-line Mode

1) Turn off the UPS inverter by pressing the “OFF” button for at least 0.5 seconds. The alarm will beep once and the UPS will enter Bypass

Mode.

Notes:

• If the UPS has been set to bypass output, it will bypass voltage from utility power to the output terminal, even though the UPS inverter has been

turned off.

• After turning off the UPS, be aware that the UPS is operating in Bypass Mode and there is risk of power loss for connected devices.

2) In Bypass Mode, UPS output voltage is still present. In order to cut off the output, switch off the line input breaker. Within a few

seconds, the unit’s LCD panel will be blank and the UPS will be completely off.

4.4.8 Turning Off the UPS with No Utility Power Present in Battery Mode

1) Turn off the UPS by pressing the “OFF” button for at least 0.5 seconds. The alarm will sound once.
2) The UPS will cut off power to output and the LCD panel will be blank.

4.4.9 Muting the Alarm

1) To mute the alarm, press the “Mute” button for at least 0.5 seconds. If the Mute button is pressed after the alarm is muted, the alarm

will reactivate.

2) Some warning alarms cannot be muted unless the error is fixed. Refer to

section 4.3

for details.

4.4.10 Operation in Warning Status

1) When the Fault LED flashes and the alarm sounds once every second, the UPS is encountering problems with its operation. Users may

view the warning indicator from the LCD panel. Check the troubleshooting table in section 6 for more information.

2) Some warning alarms cannot be muted until the error is fixed. Refer to

section 4.3

for details.