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5. Install the filler panel to prevent dust and ensure good ventilation if no power supply is installed in
the slot.
Installing a PSR720-56A/PSR1110-56A power supply
To prevent damage to the power supply or the connectors on the backplane, insert the power supply
gently. If you encounter a hard resistance while inserting the power supply, pull out the power supply and
insert it again.
For the PSR720-56A and PSR1110-56A power supplies, the installation and removal procedures are the
same. The following takes the PSR720-56A power supply as an example.
To install a power supply:
1. Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.
2. Unpack the power supply and verify that the power supply model is correct.
Put away the packaging box and packaging bag of the power supply for future use.
3. Correctly orient the power supply with the power supply slot (use the letters on the power supply
faceplate for orientation), grasp the handle of the power supply with one hand and support its
bottom with the other, and slide the power supply slowly along the guide rails into the slot until you
hear that the latch of the power supply clicks into the slot.
When you insert the power supply into the slot, you can do that through slight inertia so that the
terminals of the power supply can have a good touch with the backplane.
The PSR1110-56A power supply adds 64 mm (2.52 in) to the depth of the switch, as shown in
Figure 26.
4. Install the filler panel over the empty power supply slot to prevent dust and ensure good ventilation
if you install only one power supply.
Figure 25 Removing the filler panel
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