Xtreme Power Conversion Corporation
TX91 3.8- 10kVA User’s Manual
Page 19
Uninterruptible Power Supply
3.2 UPS Operation
Turn on the UPS with utility power supply (in AC mode)
1) After power supply is connected correctly, Set the input breaker at “ON” position. At this time the fan
is 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 get 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 0.5s to turn on the UPS and the buzzer will beep once.
3) A few seconds later, the UPS will enter AC mode. If the utility power is abnormal, the UPS will operate
in Battery mode without interruption.
NOTE: When the UPS is running out battery, it will shut down automatically at Battery mode. When the utility
power is restored, the UPS will auto restart.
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.
2. Press and hold the “ON” button for 0.5s 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.
Connect devices to 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 inductive loads such as a printer, the in-rush current should be calculated
carefully to ensure 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 nominal power capacity to prevent overload for sys
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tem safety.
5. If the overload time is over acceptable time listed in spec at AC mode, the UPS will automatically trans
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fer to Bypass mode. After the overload is removed, it will return to AC mode. If the overload time is over
acceptable time listed in spec at Battery mode, the UPS will become fault status. 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 directly.
Charge the batteries
1. After the UPS is connected to the utility power, the charger will charge the batteries automatically except in Bat
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tery mode or during battery self-test.
2. It is suggested to charge batteries at least 10 hours before use. Otherwise, the backup time may be shorter than
expected.
Battery mode operation
1. When the UPS is in Battery mode, the buzzer will beep 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 quickly (once every sec) to remind users that the battery is at low
level and the UPS will shut down automatically soon. Users could switch off some non-critical loads to dis
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able the shutdown alarm and prolong the backup time (the UPS would cut off the programmable output
terminal automatically when the programmable timer function is enabled). If there is no more load to be
switched off at that time, you have to shut down all loads as soon as possible to protect the devices or save
data. Otherwise, there is a risk of data loss or load failure.
2. In Battery mode, if buzzer sound annoys, users can press the Mute button to disable the buzzer.
