Replacing Power Supply Units
Replacement Procedure
Follow these steps to replace a PSU/7HU-DC, PSU/7HU-DC-HP, or PSU/7HU-DC-
800.
To prevent ESD damage to adjacent optical modules, take normal static
precautions in replacing the module.
Note
Upgrading to a PSU/7HU-DC-800 requires installing a 25 A fuse panel
(see Step 9 of this procedure), unless your current fuse panel supports
25 A.
It is assumed that you are familiar with power supplies and are aware of the electrical
safety precautions that are to be taken to avoid personal injury and damage to the
equipment.
Several tasks must be completed. Some tasks are detailed in sub-tasks. Pay attention to
the safety notices and additional information that are given below.
Step 1 Attach a wrist strap to your wrist and fasten the grounding wire onto the ESD
grounding point on the shelf (if available) or to a bare metal surface onto the
rack.
Step 2 If mounted, remove the front cover from the shelf as described in āRemoving
an SH7HU, SH9HU, or SHX9HU Front Coverā on p.ī768.
Step 3 Find the faulty PSU which has to be replaced.
Step 4 Disconnect the faulty PSU from the associated DC power source as follows:
Risk of Power Failure!
Do not disconnect the wrong PSU, otherwise you risk accidentally powering down
the whole shelf.
a) Turn off the corresponding power switch of the DC power source that is
connected to the faulty PSU.
Note
If only one PSU/7HU-DC-HP is installed into the shelf, a controlled
power down is not given. Once the unit is removed, it is in pending status
and voltage is no longer available via the backplane. It takes at least 1
hour until the unit is discharged completely.
Note
For a controlled power down of one PSU/7HU-DC-HP, two redundant
power supplies have to be installed into the shelf. A controlled power
down of a PSU/7HU-DC is provided when one unit is installed. After
switch-off, the power LED turns red. The power supply unit has to be
removed from the shelf for at least 30 seconds to discharge completely.
The power LED goes off as soon as the unit is removed from the
backplane connector.
710 FSP 3000R7 Maintenance and Troubleshooting Manual - Product Release 16.2 - Document Issue A
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