Vertiv Liebert EXM - 3.2.3 UPS Input Configuration

Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 21
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 7 and 8 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 7 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. 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 480V coils
to the bypass.
Field-Supplied Wiring
* External overcurrent protection
by others
* Bypass
AC Input
3-Wire + GND
See Note 6
AC Output
480V
3-Wire + GND
* Rectifier
AC Input
3-Wire + GND
Static Bypass
UPS Cabinet
Battery
Output
Busbar