Replace an 800 W Internal DC Power Supply
The switches have two bays for hot-swappable power supplies. In a switch with a
redundant power conguration, you can replace one power supply without powering
down the switch.
Note
All installed power supplies must blow air in the same direction and must
match the airow direction of the installed fan modules.
Caution
Make sure that the DC power supply circuit is not overloaded. Use proper
overcurrent protection, such as a circuit breaker, to prevent overcurrent
conditions. You can use up to a 30-Amp breaker.
Replace an 800 W DC Power Supply
Warning
Be sure to disconnect all power cables before you disconnect the chassis
ground wire.
To replace an 800 W DC power supply, follow these steps:
1. Attach an ESD-preventive wrist strap to your bare wrist and connect the metal end
to an appropriate ground point on the rack.
2. Note the orientation of the installed power supply, and the location of the latching
tab at the right of the unit.
3. Push the latching tab toward the power supply handle and pull outward on the
handle to disengage the power supply internal connectors.
4. Carefully slide the power supply the rest of the way out of the switch.
Caution
Power supplies can become very hot during operation. Wear thermal
protective gloves when you remove a power supply from an operating
switch.
Note
If you are not installing a replacement power supply, install a cover over the
unoccupied power supply bay. Unoccupied bays must always be covered to
maintain proper system ventilation and EMI levels.
5. Verify that the replacement power supply is oriented the same way as the unit you
removed, and has the same airow direction.
6. Carefully slide the power supply all the way into the power supply bay until the latch
snaps into place, as shown in Figure 28.
Caution
Do not slam the power supply into the switch.
Replace an 800 W Internal DC Power Supply Remove and Replace Components
70 Extreme 7720 Hardware Installation Guide
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