Replacing Power Supply Units
Slots 1+2 and/or 19+20 of the SH9HU, SHX9HU, SH7HU or SH7HU-R shelves are
reserved for the PSUs. Though the PSU/7HU-AC-800 may be installed in any slot of a
SHX9HU shelf, it is recommended to install it in slot 1+2, 10+11, or 19+20. 1HU
equipment shelves with rear power access (SH1HU-R and SH1HU-R/PF) require the
power supply units to be placed through the back.
The FSP 3000R7 shelves are normally equipped with dual PSUs.
Note
The PSUs are hot swappable, which means they can be removed and
replaced while the FSP 3000R7 system is powered on and running.
However, before you remove and replace a PSU, determine if the
system provides power supply redundancy or non-redundancy.
When running in power redundancy mode, you can replace or upgrade a PSU while the
system is operating. Only one PSU can be replaced at a time. The second PSU must
remain connected to the AC or DC power source. Operating in non-redundant power
mode (only one PSU is installed in the shelf) will require a complete system power off
when removing, replacing or upgrading a power supply.
Note
Ensure that you have the replacement or upgrade unit available and
unpacked before you remove a PSU from an active shelf. Always
replace a PSU immediately to fully restore power redundancy.
If a replacement PSU is not available, either leave the original power supply in the shelf or
remove it and fill the empty slots with two dummy modules (DM/5HU) until you have the
replacement unit. While a PSU is not installed, airflow through the shelf is reduced, and
the EMI emissions requirements are not met.
There is no on/off power switch on the PSUs! To disconnect the supply voltage from the
PSU you need to unplug the power cord on AC units or cut off the power with the
associated circuit breaker to the DC unit.
Always assume that a high voltage potential exists within a PSU while servicing it, even
if it is de-energized and disconnected from its power source.
Power Supply Removal Alarm
The management software constantly monitors the system modules within the shelf for
system-critical events. Removing a power supply unit from the shelf is detected and a
corresponding alarm (RMVD alarm) is generated by the management system. This alarm
is listed in the Event Log table and Fault Management table. To avoid raising an RMVD
alarm after the same PSU has been reinserted completely, comply with the following rule.
Note
A quick sequence of removing and reinserting a PSU is not allowed.
Make sure that at least 30 seconds has elapsed between removal and
reseating the same unit.
For specific information about the power supply units, refer to the Hardware Description
and Module and System Specification.
698 FSP 3000R7 Maintenance and Troubleshooting Manual - Product Release 16.2 - Document Issue A
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