Xtreme Power Conversion Corporation
E91 User’s Manual
Page 46
Uninterruptible Power Supply
3. Remove units from the parallel system
There are two methods to remove units from the parallel system:
First method:
1) Touch “CONTROL” > “Turn off UPS” and select “Yes” to turn of the UPS. Then, the UPS will enter into Bypass
mode or No Output mode without output.
2) Turn off the external output breaker of this unit, and then turn off the input breaker of this unit.
3) Turn off the battery breaker(only available in long-run model) and remove the parallel and share current
cables. And then remove the unit from the parallel system.
Second method:
1) If the bypass is abnormal, you can not remove the UPS without interruption. You must cut off the load and
shut down the system.
2) Make sure the bypass setting is enabled in each UPS and then turn off the system. All UPSs will transfer to
Bypass mode. Remove all the maintenance bypass covers and set the maintenance switches from “UPS” to “BPS”
position. Turn off all the input breakers and battery breakers in parallel system.
3) Turn off the output breaker and remove the parallel cable and share current cable of the UPS which you want
to remove. Now, you can remove the UPS from parallel system.
4) Turn on the input breaker of the remaining UPS and the system will transfer to Bypass mode. Set the
maintenance switches from “BPS” to “UPS position and put the maintenance bypass covers back on.
5) Turn on the remaining UPS according to the previous section.
Warning: (Only for the parallel system)
● Before turning on the parallel system to activate inverter, make sure that all unit’s maintenance switch at the
same position.
● When parallel system is turned on, please do not operate the maintenance switch of any unit.
● The parallel system DOES NOT support ECO mode. Therefore, please DO NOT “enable” ECO mode in any unit.
