LIEBERT® MPX™ PEM
Quick Installation Guide
SL-20821_REV7
590-1624-501B
1
WARNING: Before assembling and
installing a Liebert® MPX™, read
and understand all warnings and
cautions in the Liebert® MPX™
Rack Power Distribution Unit User
Manual which can be downloaded
at www.VertivCo.com.
Vertiv strongly recommends that
the MPX power entry module
(PEM) be installed by an individual
who is properly trained and
qualified to perform electrical work.
The MPX rack PDU contains high
voltage that can cause serious
personal injury or death. Install the
unit in a restricted-access location.
Connecting input power before the
MPX PEM is installed can cause arc
flash and can result in death. Do
not connect input power to the
MPX PEM until the MPX rack PDU
is fully assembled.
Do not connect more than one
MPX PEM to an MPX power rail
chassis (PRC). Installing more than
one MPX PEM will result in serious
injury or equipment damage.
To attach an MPX™ PEM to an
MPX™ PRC:
1. Preparing for installation
Ensure the module’s circuit breaker
is in the o/open position and the
screw latches at each end of the
MPX PEM are positioned to fit into
the MPX PRC slot.
2. Aligning the MPX PEM power
blades
Position the MPX PEM so the power
blades align with the power bus on
the MPX PRC.
3. Positioning and connecting
the module to the MPX PRC
Hold the MPX PEM at an angle
against the MPX PRC end cap and
press down so that the MPX PEM
power blades engage firmly into the
MPX PRC power bus.
4. Securing the module to the
MPX PRC
Use the provided tamper-resistant
Torx™ (TR20) screwdriver bit to
press each screw latch downward.
Turn the screw latch 90 degrees
(one-quarter turn) to seat the
locking tab. Turn the screw latch an
additional 180 degrees (one-half
turn) until it locks.
WARNING: Do not use power
tools or pneumatic equipment
to secure the screw latch.
Do not turn the screw latch
more than 270 degrees (a
three-quarter turn).
NOTE: If using a torque-
limiting screwdriver, carefully
press the screw downward
first before turning. To prevent
MPX™ PEM
Bottom view
MPX™ PEM Configuration
End cap
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MPX™ PEM and PRC
End view
Power bus
