3. In just a few seconds, the UPS will enter into AC mode. If the mains is abnormal, the UPS will operate in Battery
mode without interruption.
NOTE: When the UPS runs out battery, it will shut down automatically in Battery mode. When the mains is normalized,
the UPS will auto restart in AC mode.
Turn on the UPS without utility power supply (in battery mode):
1. Make sure that the required strings of batteries are connected correctly in order of +,GND,- terminals and the
breaker of the battery pack is at ON position (in case of external battery).
2. Turn ON the output breaker.
3. Press the COLD START button to wake up the LCD screen first. Touch CONTROL and select UPS on/off icon. It
will show Turn on UPS? in screen and select Yes. See Figure 3.13 on page37 .
4. In just a few seconds, the UPS will be turned on and enter into battery mode.
Connect devices to UPS:
After the UPS is turned on, you can connect devices to the UPS.
1. Turn on the UPS first and then switch on the devices one by one. The LCD panel will display total load level.
2. 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.
3. If the UPS is overload, the buzzer will beep twice every second.
4. When the UPS is overload, 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.
5. 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.
Charge the batteries:
1. 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.
2. It is recommended to charge batteries for at least 10 hours before operation. Otherwise, the backup time may be
shorter than expected.
Battery mode operation:
1. When the UPS is in Battery mode, the buzzer will sound according to different battery capacity. If the battery
capacity is more than 25%, the buzzer will beep once every 4 seconds. If the battery voltage drops to the alarm
level, the buzzer will beep once every sec to remind users that the battery is at low level and the UPS will shut
down imminently. Users could switch off some non-critical loads to disable the shutdown alarm and prolong the
backup time. If there is no more load to be switched off, you have to prepare shutdown procedure to preserve
working data or devices. Otherwise, there is a risk of data loss or load failure.
2. In Battery mode, users can touch SETTING ÚBasic ÚAudio Mute to enable Mode Mute to disable the buzzer.
3. In case of external battery installation, the backup time depends on the external battery capacity.
4. The backup time may vary from different operating temperature and load type.
3 Operations Proprietary and Confidential ©2024 Vertiv Group Corp. 69
Vertiv™ Liebert® MTP Online UPS User Manual 20-40-80kVA
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