Emerson 115-120 Manuel D’Utilisation

The Liebert

®

 APM

™

 is constructed with a steel frame and removable panels. Top and side panels are 

secured to the chassis by screws. The doors may be opened for access to power connections bars, 

auxiliary terminals blocks and power switches.
The UPS comes with an Operator Control Panel that provides basic operational status and alarm 

information. The cabinet houses both the power components and the internal batteries. Cooling is 

provided by internal fans. The unit sits on four casters. Adjustable stops are provided to prevent the 

UPS from moving once it has been moved to its final position.

There are no ventilation grilles on the sides of the UPS. The sides must be accessible during 

installation. After installation, the unit must have a clearance of 12 in. (305mm) in the rear to permit 

adequate circulation of air exhausted from the UPS. The Top Fan option eliminates the 12" (305mm) 

rear clearance requirement, but it increases the Liebert APM’s height by 7.63" (194mm).
To enable routine tightening of power terminations within the UPS, make sure there is sufficient 

clearance in front of the Liebert APM to permit free passage of personnel with the door fully opened.
Leave a minimum of 24 in. (610mm) between the top of the UPS and the ceiling to permit adequate 

air circulation above the unit. Emerson recommends against using air conditioning or other systems 

that blow air onto the top of the unit.

If the Liebert APM, Liebert BDC or battery cabinet is to be placed on a raised floor, the UPS should be 

mounted on a pedestal that will support the equipment point loading. Refer to the bottom view in 

Figures 31, 37 or 40 to design this pedestal.

Cables can enter the Liebert APM, Liebert BDC and battery cabinets from the top or bottom through 

removable metal plates.
Some plates have factory-punched holes and others are designed to allow the personnel to punch 

holes for fitting and securing the conduit. Once the conduit holes are punched, these plates should be 

reattached to the UPS. The conduit size and wiring method must be in accordance with all local, 

regional and national codes and regulations, including NEC ANSI/NFPA 70.
The UPS must be accessible from the right side to allow personnel to complete the cable connections 

and make necessary adjustments. After installation is complete, the Liebert APM may be serviced 

from the front.

Risk of heavy units tipping over while being moved. Can cause property damage, injury and 

death.
The Liebert BDC

™

 and battery cabinets must be properly prepared and secured for lifting. 

Improper lifting may cause the cabinets to fall, causing personal injury or death and 

equipment damage.
Emerson recommends lifting the units with one of the following methods:
• Installing four eyebolts in the factory-fabricated holes, one at each corner of the unit, 

attaching cables or similar strapping to the eyebolts and lifting with a suitable mechanism.

• Placing suitable straps on the Liebert BDC

™

 or battery cabinet. The straps must go under 

the unit to be lifted.

NOTE
When installing the UPS, the customer must provide a disconnect with overcurrent protection