Electrical Connections—UPS
17 Liebert
®
eXM
™
3.2.3 UPS Input Configuration
By default, the Liebert eXM ships with internal links installed between the bypass input and main
(rectifier) input (single input configuration).
Figures 6 and 7 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.
To wire the Liebert eXM as a single source dual-input UPS, remove the links and wire the bypass feed
to the bypass busbars, then wire the main feed to the main busbars (see Figure 9).
Figure 6 Single UPS block diagram—Dual input, single source configuration, without bypass cabinet
NOTES
1. Install in accordance with national and local electrical codes.
2. Input and bypass must share the same single source.
3. A neutral is required from the system AC input source. A full
capacity neutral conductor is recommended. Grounding
conductors are recommended.
4. Bypass and rectifier inputs and output cables must be run
in separate conduits.
5. Control wiring must be run in separate conduits.
6. Customer must supply shunt trip breakers with 120V coils
to the bypass.
Field-Supplied Wiring
* External overcurrent protection
by others
* Bypass
AC Input
4-Wire + GND
See Note 6
AC Output
208V
4-Wire + GND
* Rectifier
AC Input
4-Wire + GND
Static Bypass
UPS Cabinet
Battery
Output
Busbar
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