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11. OPERATION: PARALLEL UPS
Operating modes of UPS connected in parallel are essentially the same as those of individually operating UPS. However, it's important to note that
in a parallel system, ALL UPS must operate in the same mode simultaneously. Parallel connection does not allow any UPS to operate in a different
mode from the rest UPS in the system.
Removing a UPS from a Working Parallel System
There are two (2) ways to isolate a UPS from a parallel system:
A) Total Shutdown:
Shutting down all UPS in an orderly manner, and then isolating the UPS to be removed from the system by opening the switches and breakers.
B) Removing a UPS while keeping the other UPS in the system in Online mode:
** Check the compliance with all requirements listed below:
Basic Requirements for Intervening in a UPS Operating in a Parallel System.
1.- Procedure must be carried out exclusively by highly trained personnel with full knowledge of UPS and the electrical installation they work with.
2.- The operation must be coordinated with the system administrator, who should be informed of the risk of a potential system shutdown in case of
unexpected events, such as:
- Power outage during the intervention, and the remaining units may not provide sufficient backup time to keep the system operational before
reintegrating the intervened UPS,
- Unexpected activation of any circuit protection devices that could trigger a general shutdown or unexpected UPS system failure, etc.
3.- There must be a written plan detailing each step of the operation.
4.- UPS that will remain operational must have the capacity to supply required power (continuous and peak) to the system once the UPS being
intervened is removed.
5.- Each UPS should have its own external protection devices (breakers) allowing it to be disconnected and isolated from the parallel system.
6.- There must be enough workspace to work comfortably on the UPS to be maintained without interfering with UPS that will remain operational.
Note: Non-compliance with any of these requirements prohibits individual intervention and requires a complete system intervention.
If all the requirements are met, proceed as follows:
1.
Follow the UPS turn-off procedure:
Touch CONTROL icon / Touch UPS ON/OFF command. / Confirmation prompt "TURN OFF UPS?", touch "YES."
NOTE: Once powered off, UPS shuts down outputs and enters a state like being powered off, but with LCD still active. UPS cannot enter BYPASS
mode since it is connected to other UPS that energized outputs.
From this moment on, any main power supply failure will be managed by other UPS.
2.- Turn off (set to OFF) the output breaker/switch to electrically isolate its outputs.
3.- Turn off (set to OFF) the AC input breaker/switch located on the rear panel of the intervened UPS.
4.- Turn off (set to OFF) the battery breaker/switch in case there are external batteries.
Wait for a few seconds until the display on the intervened UPS turns off.
4.- Open external input protections (Breakers) to electrically isolate its inputs.
5.- Disconnect, ONLY at the rear panel of the UPS to be removed, parallel control connectors (Parallel and Shared Current). Other UPS should keep
their parallel cables unchanged.
NOTE: If any of the cables from the other UPS that will remain operational are disconnected, a communication error will occur, disrupting the
system normal operation.
At this point, the UPS is powered off, electrically isolated from the system, and ready for individual intervention or removal from the system.
Adding a UPS to an Operative Parallel System
• Adding a new UPS to a parallel system that is currently operational is not possible. System must be powered off to include the new UPS.
• Total number of UPS units should not exceed 3 units for this model.
• Firmware of all UPS to be connected in parallel must be compatible.
• Setting (parameters from the LCD Setting Menu) of the UPS to be added must exactly match setting of already installed UPS.
• Follow the procedure outlined in this manual to install the new UPS units in parallel system.
www.xmart-ups.com
USER MANUAL – OPTIMA T10 15K/20K
VER.2311.09 (ENG)
69
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