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Modifications reserved
2.7.3
Adding an UPS to an existing parallel system
1. Install a main maintenance mechanical switch or static switch for the parallel system.
2. Regulate the output voltage of the new UPS. Check if the output voltage difference between the new UPS
and the parallel system is lower than 0.5V.
3. Ensure that the bypass of the parallel system is normal and the bypass setting is “enabled”, then press
the Power-on button to turn off the UPS. The UPS will work in bypass-mode.
4. Set the main maintenance switch or static switch from “UPS” to “BPS”.
5. Switch off the main output breaker and the input breaker and mains breaker. The UPS will shut down.
6. Connect the cable and wire of the added UPS according to Figure 27 and Figure 28.
7. Switch on the input and mains breaker and check that every UPS works in Bypass-mode.
8. Switch on the output (O/P) breakers and Main output (Main O/P) breaker.
9. Transfer the main maintenance switch or static switch from “BPS” to “UPS”.
10. Press the Power-on button of one UPS and each UPS will start the shutdown process. Both UPS will then
work in parallel in online-mode.
2.7.4
Removing a Single UPS from a parallel system
1. A main maintenance mechanical switch or static switch should be installed for the parallel system.
2. Ensure the bypass is normal and the bypass setting is “enabled”.
3. Press the Power-on button to turn off the UPS system. The UPS system will work in bypass-mode.
4. Transfer the main maintenance switch or static switch from “UPS” to “BPS”
5. Switch off the output, the input and the mains breaker for both UPS. The UPS will shut down.
6. Switch off the main output (O/P) breaker and the output breaker of the UPS system.
7. Remove the chosen UPS, cables and wires.
8. Switch on the mains breaker and input breaker of the reserved UPS, make sure the UPS work in bypass-
mode.
9. Switch on the O/P breaker and main O/P breaker.
10. Transfer the main maintenance switch or static switch from “BPS” to “UPS”
11. Press the Power-on button to turn on the UPS. The UPS will start up and run in online-mode.
2.8 Installation
Checklist
All packing materials and restraints have been removed from each UPS.
Each unit in the UPS system is placed in the installed location.
All conduits and cables are properly routed to the UPS and auxiliary cabinets.
All power cables are properly sized and terminated.
A ground conductor is properly installed.
Battery enclosure installation instructions have been completed.
Air conditioning equipment is installed and operating properly.
The area around the installed UPS system is clean and dust-free.
Adequate workspace exists around the UPS and other cabinets.
Adequate lighting is provided around all UPS equipment.
Any optional accessories are mounted in their installed location and properly wired.
Start-up and operational checks performed by authorized service personnel.
All network connections are completed.
