Ups Output; Ups Input Configuration - Vertiv Liebert EXM User Manual

4.2.2 UPS Output

If an external distribution panel is used for load distribution, the selection of protective devices must provide discrimination
with those that are used at the input to the UPS (see Table 8.9 on page 77 ).

4.2.3 UPS Input Configuration

By default, the Vertiv™ Liebert® EXM ships with internal links installed between the bypass input and main (rectifier) input
(single input configuration).
Figure 4.1 below and Figure 4.2 on the next page show the Liebert® EXM in a split bypass (single source dual input)
configuration. In this configuration, the static bypass and the maintenance bypass lines are supplied by the same source using
separate feeds. Both feeds must be protected externally with properly sized protective devices.
Wire Liebert® EXM Input as Single Source Dual Input
To wire the Liebert® EXM as a single source dual input UPS, remove factory installed links between rectifier and bypass input
busbar (see Figure 4.3 on page 24 ).
Figure 4.1 Single UPS Block Diagram Dual Input, Single Source Configuration, without Bypass Cabinet
Notes to Figure
1. Install in accordance with national and local electrical codes.
2. Input and bypass must share the same single source.
3. Grounding conductors are recommended.
4 Electrical Connections UPS Proprietary and Confidential ©2023 Vertiv Group Corp.
Vertiv™ Liebert® EXM UPS User Manual
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