XMART Optima 33 30K - Manual (Page 29)

USER MANUAL - OPTIMA-33 10K / 20K / 30K
www.xmart-ups.com 130612-OPTIMA-33 10K/20K (ENGLISH) - 27
10.- OPERATION: PARALLEL UPS
UPS operation modes for UPS in parallel are basically same than described for single UPS.
However it is important to remark all UPS in parallel system must work under same mode at same time. Parallel function does not allow
different operation modes between UPS of the system.
Removing an UPS from a Parallel System
There are 2 procedures to isolate and remove one UPs from operative parallel system:
A) Total Power-Off:
Powering off all UPS of the system. This is the less risky procedure.
B) Keeping Parallel system in ONLINE mode:
First check all below requirements are complied before trying to follow this procedure.
Requirements for removing one UPS in operative UPS:
1.- This operation must be performed only by qualified and trained personnel.
2.- This operation must be coordinated with the system administrator. System administrator must know about the related risks of this procedure
since the system could be shut down during operation because external reasons like:
- If during this operation occurs a failure in main AC line, battery backup of remaining UPS could not be enough to keep system running
before reconnecting removed unit.
- External breakers could be activated randomly during operation so system could be tripped.
3.- There must be a detailed plan to perform this procedure identifying all maintenance activities to be performed on removed unit before
reconnecting it.
4.- Remaining UPS must be able to support the power system after selected unit is removed.
5.- Each UPS must have their own external protections to allow total electrical isolation
6.- There must be enough physical room to allow comfortable access to all UPS of the system.
Note: if any of the above requirements cannot be complied, below procedure must not be performed.
In case all requirements can be complied proceed as follow:
1.- Power off selected UPS by OFF button in front panel.
Note: OFF button must be selected twice. If OFF is selected only one time, UPS will not respond. Once UPS is turned off it will shut down its
outputs but remaining LCD on. This UPS will not go to bypass mode since it is working in UPS system with other UPS generating their output
from their inverters. At this moment any failure in AC main line must be supported by operative UPS.
2.- Set AC input breaker located in rear panel of the selected UPS to OFF position.
3.- Set external output breakers of selected UPS to OFF position.
4.- Set external input breakers of selected UPS to OFF position.
5.- Once LCD is turned Off, in selected UPS to be isolated, disconnect control parallel cables (parallel cables and current share cables) from its
rear panel. Other operative UPS must keep their control parallel cables connected.
NOTE: If you disconnect parallel control cables in any of the operative UPS of the system, a communication problem will occur and the parallel
system will be shut down.
At this moment selected UPS is currently powered off and isolated so that it can be serviced or simply removed.
Adding an UPS to a Parallel System
• For adding a new UPS to an operating system, all UPS must be turned off and all equipments must be disconnected from UPS
outputs.
• Total UPS quantity must be 3 or lower.
• Firmware of all UPS must be compatible for allowing parallel functionality.
• New UPs must be configured with similar LCD configuration menu than current UPS of the system.
• Follow the procedure explained in Installation Section of this manual.