Njoy Ranger 30KR User Manual page 54

3. Connect devices to UPS
After the UPS is turned on, you can connect devices to the UPS.
• Turn on the UPS first and then switch on the devices one by one. The
LCD panel will display total load level.
• If it is necessary to connect the inductive loads such as a printer, the in-
rush current of the load should be calculated carefully to see if it meets the
overload capability of the UPS. Any load more than 150% over designed
capacity the runtime will be less than 60ms
• If the UPS is overload, the buzzer will beep twice every second.
• When the UPS is overload, please remove some loads immediately. It
is recommended to have the total loads connected to the UPS less than
80% of its nominal power capacity to prevent overload for system safety.
• If the overload time is over acceptable time listed in spec in AC mode,
the UPS will automatically transfer to Bypass mode. After the overloading
was resolved, it will return back to AC mode. If the overload time is over
acceptable time listed in spec in Battery mode, the UPS will enter fault
status.
At this time, if bypass is enabled, the UPS will power to the load via
bypass. If bypass function is disabled or the input power is not within
bypass acceptable range, it will cut off output entirely.
4. Charge the batteries
• After the UPS is connected to the mains and turned on in AC mode, the
charger will charge the batteries automatically except in battery mode,
during battery self-test, overload or when battery voltage is high.
• It's recommended to charge batteries for at least 10 hours before
operation. Otherwise, the backup time may be shorter than expected.
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