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Internal
3-4. Single UPS Operation
1. Turn on the UPS with utility power supply (in AC mode)
1) After power supply is connected correctly, set the breaker of the battery pack at “ON” position (if
available). Then, set the input breaker at “ON” position. At this time, the fan starts running and
the UPS supplies power to the loads via the bypass. The UPS is operating in Bypass mode.
NOTE: When UPS is in Bypass mode, the output voltage will directly power from utility after you
switch on the input breaker. In Bypass mode, the load is not protected by UPS. To protect your
precious devices, you should turn on the UPS. Refer to next step.
2) Press and hold the “ON” button for 1s to turn on the UPS and the buzzer will beep once.
3) A few seconds later, the UPS will enter to AC mode. If the utility power is abnormal, the UPS will
operate in Battery mode without interruption.
NOTE: When running on battery, if the battery has run out of charge, UPS will shut down automatically.
When the utility power is restored, the UPS will auto restart in AC mode.
2. Turn on the UPS without utility power supply (in Battery mode)
1) Make sure that the breaker of the battery pack is at “ON” position (if available).
2) Press and hold the “ON” button for 1s to turn on the UPS, and the buzzer will beep once.
3) A few seconds later, the UPS will be turned on and enter to Battery mode.
3. Connect devices to UPS
After the UPS is turned on, you can connect devices to the UPS.
1) Switch on the devices one by one and UPS will display total load level in LCD panel.
2) If it is necessary to connect the inductive loads such as a printer, the in-rush current should be
calculated carefully to see if it meets the capacity of the UPS, because the power consumption of
this kind of loads is too big.
3) If the UPS is overloaded, the buzzer will beep twice every second.
4) When the UPS is overloaded, please remove some loads immediately. It is recommended to have
the total loads connected to the UPS less than 80% of its max power capacity to prevent overload
for system safety.
5) If the overload time exceeds acceptable time listed in spec at AC mode, the UPS will automatically
transfer the load to Bypass mode. After the overload is removed, it will return to AC mode. If the
overload occurs 3 times in half hour, the UPS will be locked in Bypass mode. UPS can transfer to
Line mode only by manual restart. At this time, if bypass is enabled, the UPS will power the load
via bypass. If bypass function is disabled or the input power is not within bypass acceptable range,
it will cut off output.
4. Charge the batteries
1) After the UPS is connected to the utility power, the charger will charge the batteries automatically
except in Battery mode or during battery self-test.
2) It’s suggested to charge batteries at least 10 hours before use. Otherwise, the backup time may
be shorter than expected time.
3) Ensure that the number of batteries connected to UPS and its setting on the control board (Please
refer to the section 3-4-11 for detailed setting) is correct.
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