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User Manual 10H52260UM60 - Rev. 1 - 10/2017
It is important to close the bypass switch (Q2) before opening the maintenance bypass switch; otherwise the power supply to
the load will be interrupted.
5. Set internal maintenance bypass switch Q3 to off. Return the Q3 baffle to its original position, then fasten the
retaining screws.
6. Close the rectifier input switch Q1, wait for the rectifier to start-up.
7. Press the power button on the operator and display panel of the UP so that the UPS transfers to Inverter mode.
At this point, the load has transferred to UPS normal mode.
5.4
UPS Shut-down Procedures
Procedures For Completely Powering Down the UPS
In order to shut the UPS down completely and disconnect the power supply to the load, proceed as follows: All
power switches, isolating switches and breakers are switched to off, and the UPS no longer supplies power to the
load.
Caution
The following procedures will interrupt the power supply to the load, switching it off.
1. Press the power button on the display panel, the UPS will transfer to Bypass mode.
2. Unplug the REPO terminal at rear of the UPS to deactivate the rectifier, inverter, static switch and battery.
3. If the UPS is equipped with an external battery, set the corresponding external battery switch to off.
4. Set the rectifier input switch Q1 and bypass input switch Q5 to off. At this point, all the internal power supplies are
deactivated and the LCD screen is switched off.
Warning
1. Post a label on the AC input distribution line (generally at a distance from the UPS) to alert personnel that UPS
maintenance is in progress.
2. Wait 10 minutes for the internal DC bus capacitors to discharge. Then the UPS is completely shut down.
Warning: hazardous battery voltage
Hazardous voltages are still present on the battery terminals, even after the UPS has been shut down.
Procedures Shutting Down the UPS Completely While Maintaining Power To Load
The following procedures may be used to shut the UPS down completely are applicable for completely, while
maintaining the power supply to the load. Refer to the procedures in 5.3.4 .
5.5
REPO
The REPO port, located at rear of the UPS, is designed to switch off the UPS in the event of an emergency (such as
fire, flood). After unplugging the REPO terminal, the system will switch off the rectifier and inverter, and interrupt
the power supply to the load immediately (inverter and bypass output included), while the battery will stop charging
or discharging.
After EPO, if the mains input is present, the UPS control circuit will remain active; however, the output is interrupted.
To completely remove all mains power from the UPS, first disconnect the UPS external mains switches, and then
disconnect the battery terminals.
