Appendix C: Field-Replaceable Units
7750 SR-a4 and SR-a8 Installation Guide 173
7750 SR-a AC PSU
If you are operating your 7750 SR-a with redundant PSU modules, you can install, remove,
or replace a PSU module without affecting system operation.
Removing an AC PSU
Figure 56 and Figure 57 show how to remove an AC PSU from the 7750 SR-a chassis.
Table 88 describes the features.
Note:
• The 7750 SR-a4 chassis requires a minimum of one PSU to operate, but two are
recommended for redundancy. The 7750 SR-a8 chassis requires a minimum of two
PSUs to operate, but four are recommended for redundancy.
• For full redundancy, each PSU module should be attached to an independent power
source with a dedicated circuit breaker. A fully redundant system must be connected to
both DC PSU modules, or both AC PSU modules, or one DC and one AC PSU module.
• In the event of a PSU module failure, the entire module must be replaced. There are no
field-serviceable parts inside the PSUs.
Danger: Unplug the power cable from the remote power source during the PSU module
removal and replacement procedures.
Note: Refer to 7750 SR-a –48 VDC PSU LED and Connectors on page 139 for a
description of the PSU.
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