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Appendix A.4.4 Liebert FS Configuration - Single Liebert FS on Series 300 DC Bus
The following Software Control Parameters must be reset when the Liebert FS is connected to the DC
Bus of the Liebert Series 300 UPS system.
Instructions to set these parameters on the Liebert FS are in 6.5.3 - Control Parameters Setup at
Initial System Startup.
Appendix A.4.5 Liebert FS Configuration - Multiple Liebert FS Units on Liebert Series 300 DC
Bus
Liebert FS Software Control Parameters must be reset when multiple Liebert FS units are connected
in parallel on the DC bus of a Liebert Series 300 UPS system for proper operation with longer run
times or higher backup power requirements.
Instructions to set these parameters on the Liebert FS are in 6.5.3 - Control Parameters Setup at
Initial System Startup.
NOTE
The Software Control Parameter values specified below are recommended. These values may
require adjustments due to the battery type. These must be used unless otherwise specified by
the Liebert-certified service technician at initial system startup.
Table 26 Liebert FS Software Control Parameter settings
Liebert FS Software Control Parameter Setting
Charge Voltage 395VDC
Regulation Voltage 385VDC
Vreg Delta 0VDC
Maximum Charge Current See Table 27
Charge Amps/Volts See Table 27
Table 27 Liebert FS Software Control Parameters varying with UPS size
UPS Output Rating (kVA) 10 15 20 30 40 50 65 75 100 125
Liebert FS Maximum Charge Current (A) 5 8 10 16 21 26 34 39 50 50
Liebert FS Charge Amps/Volts (A/V) 0.7 1.1 1.4 2.1 2.8 3.5 4.5 5.2 6.7 6.7
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.