Chapter 9. Check, Adjust, Remove, and Replace Procedures 9-7
Replacing a Power Supply Unit
Figure 9-5. Power supply unit
The switch on the rear of each power supply unit ( in Figure 9-5) controls power for
the library.
Note: Power supply units remain powered ON when still connected to an ac source.
The two power supply units provide redundancy and help ensure that the library
does not lose power (and become inaccessible) if one of the power supply units
should happen to fail. The library operates seamlessly between the two power supply
units. The power supplies can be hot-swapped as required without powering OFF to
the library.
The second power supply unit should also be connected to a different ac circuit from
the first power supply or to a separate power distribution source. In the event that
one power supply fails or becomes unstable, the other power supply will
automatically power the library.
Removal Procedure
1. Power OFF the power supply unit to be replaced only. If it is necessary to replace
both, take the library offline and power OFF the library by toggling the power
supply switch ( in Figure 9-5) on both supplies to the OFF (O) position.
2. Disconnect the power cable ( in Figure 9-5) from the power supply unit.
3. Loosen the blue thumb screw ( in Figure 9-5) on the power supply unit by
turning it counterclockwise.
4. Grasp the handle ( in Figure 9-5) and slowly pull the power supply unit
toward you while supporting it from underneath.
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