Lenovo 3822, 3821, 3719, 3823 manual Installing redundant power supply and fans

5.Connect one end of the power cord for the new power supply into the connector on the back of the power supply; then, connect the other end of the power cord to a properly grounded electrical outlet.

Note: If the server has been turned off, you must wait approximately 3 minutes after you connect the server power cord to an electrical outlet before the power-control button becomes active.

6.Make sure that the ac power LED on the top of the power supply is lit, indicating that the power supply is operating correctly. If the server is turned on, make sure that the dc power LED on the top of the power supply is lit also.

Installing redundant power supply and fans

You can install a second 920-watt hot-swap power-supply. This upgrade option includes a hot-swap power supply and three hot-swap fans. You must also purchase a second power cord to connect the power-supply to a power source.

To install the redundant power and cooling option, do the following:

1.Read the safety information that begins on page 5.

2.Remove the left-side cover (see “Removing the left-side cover” on page 157).

3.	Remove the three fan air baffles	from the fan bays of the fan cage
	assembly.
4.	Install the three hot-swap fans	in the empty bays of the fan cage assembly.

Chapter 7. Installing optional devices and replacing customer replaceable units 177