244 Adding Optional Hardware
Adding a Redundant Power Supply
The library supports both non-redundant and redundant power configurations. The non-redundant
configuration has a single power supply and power distribution unit. The redundant configuration has two
power supplies and two power distribution units.
This subsection provides step-by-step instructions for installing a second power supply into a module.
These instructions work for both the control module and expansion modules.
Required tools: #2 Phillips screwdriver, ESD strap
1 Open the service door on the control module or expansion module where you are adding the power
supplies.
2 Attach the ESD strap to your wrist and to an unpainted surface inside the door.
3 Use the Phillips screwdriver to loosen the thumbscrews that retain the cover plate over the power supply
slot. Discard the cover plate or leave them with the customer for future use.
4 Carefully unpackage the power supply and power distribution unit and remove them from the antistatic
bags.
You do not need to take the library offline in order to add the second power
supply for redundancy.
Power supplies are not used in expansion modules eight through eleven. Only
the control module and first seven expansion modules support a power supply.
A power supply in an expansion module powers the drives and, therefore, a
power supply must be present for each module that has a drive.
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