Power Supplies and Fan Cooling

1. Requirement - The slot directly above a CPU/Memory+ board or I/O+ board must contain a power/cooling module (PCM), because the fans in the PCM are the only source of cooling air for the board slot.

2. Requirement - All unused slots must contain a filler panel to avoid loss of cooling air.

3. Under some circumstances, you can remove a PCM from an active system for a short time. However, if the boards in the adjacent slots create large quantities of heat, it is safer to halt and power off the system first.

4. Requirement - The peripheral power supply/AC input (PPS/AC) must be fully functional if you replace a hot-pluggable board or PCM. (Only the PPS/AC provides precharge current to the system. If the PPS/AC cannot supply precharge current, the hot-pluggable module will be damaged.)

5. Requirement - The slot above the PPS/AC must contain either a PCM or an auxiliary fan tray.

6. The auxiliary peripheral power supply (PPS 1) is an option. The PPS 1 is located at the front of the system, to the right of the disk drive area.

7. Requirement - If PPS 1 is absent, the slot must contain a thermal protection module to ensure the maximum operating temperature is not exceeded.

8. PPS 1 does not provide precharge current.