Installation
P/N 06-237058-001 2-9 February 2012
Figure 2-5. Installing A Power Supply Unit into the Enclosure Top Tier (Leftmost Slot)
2-4.4 Installing the Power Management Unit (PMU) Board into Enclosure Top Tier
Note: The top tier of the enclosure has been designed to accommodate two power supply units and
a Power Management Unit (PMU) Board. Power supply units and PMU Board must be
installed first, followed by the Main Controller Board and Keypad/Display which fits over
these components.
Note: If AC power is lost on any PMU Board of a ARIES NETLink system containing multiple PSU/
PMU Board assemblies, the system will immediately stop charging standby batteries and the
batteries will supply the load of all PMU Boards that are in the Trouble state. The system
should be serviced immediately to restore AC power. Refer to Chapter 7, Troubleshooting,
for more information on probable causes of AC power loss and recommended corrective
actions.
If additional power supply units and PMU Boards are installed on a ARIES NETLink system,
the PMU Board located at the top tier should always be the board physically connected to the
Main Controller Board (both power cable and COM harness). This is to ensure that the MCB
will remain powered on in the case where the control unit is operating on battery power and
the battery voltage drops too low. The PMU Board powering the MCB is always the last one
to be shut down on low battery voltage.
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