Replacing A Power Supply Unit; Removal Procedure - IBM System Storage TS3400 Tape Library Maintenance Information

Replacing a Power Supply Unit

Figure 9-5. Power supply unit
The switch on the rear of each power supply unit (
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
2. Disconnect the power cable (
3. Loosen the blue thumb screw (
4. Grasp the handle (
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.
3
turning it counterclockwise.
in Figure 9-5) and slowly pull the power supply unit
4
toward you while supporting it from underneath.
1
3
in Figure 9-5) controls power for
3
in Figure 9-5) from the power supply unit.
2
in Figure 9-5) on the power supply unit by
1
Chapter 9. Check, Adjust, Remove, and Replace Procedures
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