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Appendix A.5.7 Liebert FS Configuration – Multiple Liebert FS Units
Liebert FS Software Control Parameters must be reset when multiple Liebert FS units are connected
in parallel on the DC bus of a Liebert HiPulse™ UPS system.
Instructions to set these parameters on the Liebert FS are found in 6.5.3 - Control Parameters
Setup at Initial System Startup.
Multiple Liebert FS Parallel Operation—Regular Configuration
Liebert FS Software Control Parameters must be reset when multiple Liebert FS units are connected
in parallel on the DC bus of a Liebert HiPulse™ UPS system for proper operation with longer run
times or higher backup power requirements. The Liebert FS units will contribute all together at the
same time to the task of supporting the UPS DC bus.
Instructions on setting these parameters on the Liebert FS are found in 6.5.3 - Control Parameters
Setup at Initial System Startup.
NOTE
In this configuration, the UPS DC bus usually does NOT have batteries in parallel with the
Liebert FS units, however, parallel operation with batteries is acceptable. If batteries to be used
are in parallel with the Liebert FS units on the UPS DC bus, contact your local Liebert sales
representative to arrange a review of the application.
NOTE
Your Liebert-certified service technician will configure the Software Control Parameter values
at Initial System Startup depending on the number of paralleled units.