Emerson 115-208 Manuel D’Utilisation

By default, the Liebert

®

 APM

™

 ships with internal links installed between the bypass input and main 

(rectifier) input (single input configuration see Figure 48).
Figure 4 shows the Liebert APM 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 APM 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 6).

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. Optional 54-pole, 225A for 45kVA frame only or optional 54-pole,
    400A for 90kVA frame only.
7. Customer must supply shunt trip breaker with 120V coil.

BIB - Bypass Isolation Breaker
MBB - Maintenance Bypass Breaker
MIB - Maintenance Isolation Breaker
* External Overcurrent Protection
  by others

Field-Supplied Wiring

UAM01023
Rev. 3

Bypass Distribution Cabinet

* Bypass

AC Input

4-Wire + GND

* Rectifier

AC Input

4-Wire + GND

See Note 7

BIB

MBB

MIB

Static Bypass

UPS Cabinet

Battery

Optional

54-Pole

See Note 6

AC Output

208V

4-Wire + GND