IBM XSERIES 255 TYPE 8685, Hardware Maintenance Manual And Troubleshooting Manual

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Power supply bay 1
(use bottom power-
cord connector) Power supply bay 3
(use top power-
cord connector)
Power supply bay 2
(use bottom power-
cord connector) Power-cord
connectors Power supply bay 4
(use top power-
cord connector)
Since the server comes with hot-swap power supplies in power-supply bays 1 and
2, you must plug a power cord into each power-cord connector in power-supply bay
1. Plug one end of each power cord into the corresponding connector on the back
of the server; then, plug the other end of each power cord into a properly grounded
electrical outlet. Power supplies 1 and 2 (PS1 and PS2, respectively) are connected
to the bottom power-cord connector in power-supply bay 1. Power supplies 3 and 4
(PS3 and PS4, respectively) are connected to the top power-cord connector in
power-supply bay 1.
Before you continue with the power-supply installation procedure, review the
following precautions:
Notes:
1. To ensure proper cooling and server operation, power-supply bays 1 and 2 must
have a power supply installed at all times.
2. The external fans (fans 7 through 9) are located in front of the power supplies.
During normal operation, each fan bay must have a fan installed for proper
cooling. See “Replacing an external fan” on page 101 for an illustration of the
external fan bays.
Chapter 4. Customer replaceable units
97