Ups Power-Off; Transferring Ups Operation Mode; Transferring Ups To Bypass Mode From Normal Mode Manually; Transferring Ups To Bypass Mode From Overload Protection - Liebert UHA1R-0100 User Manual

42 Chapter 5 UPS Operation Instructions
Turning off UPS in Bypass mode
Press and hold the OFF key for 10 seconds, the UPS stops output and enters the standby state. At this moment, the
UPS is not powered off completely. If you need to power off the UPS completely, disconnect the mains input of the
UPS.
Turning off UPS in EPO mode
The EPO switch is used to shut down the UPS upon emergency conditions, such as fire or flood. The system will turn
off the rectifier, inverter, and stop powering the load (including the inverter and bypass output) immediately, and the
battery will stop charging or discharging.
If the UPS still has main input, the UPS control circuit will remain alive, and the UPS output has been shut down. The
external main input MCB of the UPS should be disconnected, if you need to remove all mains power of the UPS.

5.6 UPS Power-off

The method of powering off the UPS is as follows:
1. After the UPS is turned off, disconnect the input cable plug, or open the upstream switch of the UPS. At this
moment, all the indicators will turn off and the fan will stop (if the battery is configured, the fan will stop 20 seconds
later), and the power-off of the UPS is complete.
2. If the UPS has an external battery, set the external battery switch to OFF position.
After the UPS is powered off, the output will be terminated, and the load will be powered off.

5.7 Transferring UPS Operation Mode

In normal condition, the UPS should be set to Normal mode. In the event of the mains failure, the UPS will transfer to
Battery mode automatically, and will not terminate the UPS output. In the event of the overload, the UPS will transfer
to Bypass mode automatically, and will not terminate the output. In the event of inverter fault and overtemperature in
the UPS, the UPS will transfer to operate in Faulty state automatically.

5.7.1 Transferring UPS To Bypass Mode From Normal Mode Manually

In Normal mode, press and hold the OFF key for one second to transfer the UPS to Bypass mode.
Refer to 1.5 UPS State And Operation Mode for the detailed introduction of the Normal mode, Bypass mode,
Battery mode and Maintenance Bypass mode.

5.7.2 Transferring UPS To Bypass Mode From Overload Protection

When the UPS load exceeds the rated value and preset time, the UPS will transfer to Bypass mode from Normal
mode, and send out hurried alarm sound every 0.5 second. At this moment, the UPS output voltage is the mains
voltage, and the redundant loads must be removed until the UPS does not generate the overload alarm again. Wait
for five minutes, the output voltage will transfer to the Normal mode automatically. To protect the load and the UPS,
the UPS cannot transfer to Bypass mode from overload protection for more than three times within one hour,
otherwise, the output will remain in Bypass mode and transfer back to Inverter mode one hour later.
In the Bypass mode, the load is powered directly by the mains supply instead of the pure power of the inverter output.

5.7.3 Transferring UPS To Inverter Mode From Bypass Mode Manually

In Bypass mode, press and hold the ON key for two seconds. After the inverter operates normally, the UPS will
transfer to Inverter mode.
Liebert ITA 10kVA UPS User Manual
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