Emerson Liebert MPX PEM 230/400VAC 63A MPXPEM-EHBAXZ30 User Manual

Follow these guidelines steps to verify that all components are properly assembled. Failure to follow 

these steps and in the documented sequence could result in a serious injury or equipment damage.
___ 1. MPX PRC

™

 (Power Rail Chassis) is securely attached to the rack.

___ 2. MPX PEM

™

 (Power Entry Module) is attached to the MPX PRC.

Ensure that the MPX PEM is securely locked onto the MPX PRC.

___ 3. Power input cable is attached to the MPX PEM, if applicable.

Variable-Capacity models have detachable cables with quick-connect couplings; Fixed-

Capacity models have integral cables.

___ 4. Optional Liebert RPC

™

 (Rack PDU Card) is installed in the MPX PEM.

___ 5. MPX BRM

™

 (Branch Receptacle Modules) are installed; the number of modules that may be 

attached varies according to the length of the Power Rail Chassis.

___ 6. Maximum electrical load is within values shown on the Liebert MPX module rating labels.
___ 7. The input power supply ratings and connections match the specifications of the unit being 

installed.

Perform these steps to determine whether the Liebert MPX is ready for use. Failure to follow these 

steps in the documented sequence could result in serious injury or equipment damage.
1. Ensure that all circuit breakers on the MPX BRMs are Off.
2. Connect the Liebert MPX unit to input power.

• Validate that only one MPX PEM (Power Entry Module) is installed on the MPX PRC (Power Rail 

Chassis).

• Verify that the MPX PEM (Power Entry Module) and MPX BRM

™

 (Branch Receptacle Module[s]) 

operating voltages are the same and match the input power source.

3. Connect equipment to the MPX BRMs.
4. Make sure the equipment to be connected to the Liebert MPX is switched Off.
5. Attach communication cables to the Liebert RPC, if one is installed in the Liebert MPX.
6. Switch On the circuit breaker of each MPX BRM where the load is connected.
7. Check the Phase Power Indicators on the MPX PEM to verify that input power is present (not 

available on Elementary MPX PEM models). The appropriate number of lights on the MPX PEM 

should be green and lit but not flashing:

• input power is single-phase—L1 should be green
• input power is single-phase 208-240VAC (North America only)—L1 and L2 should be green
• input power is three-phase—L1, L2 and L3 should be green.

8. Verify that each attached MPX BRM is displaying a non-repeated identifying number in the 

Number Indicator beside the circuit beaker (the identifying numbers’ order in the display may not 

match the mapping of their physical location on the MPX PRC) (not available on Elementary 

MPX BRM models).

9. Switch On the test equipment or connected load to verify proper operation.
10. If any MPX BRMs are Receptacle Management versions, the lights beside the receptacles should 

be lit.