Power Frus; Fan Tray - Extreme Networks Summit WM Technical Reference Manual

Power FRUs

This section describes the power field replaceable units (FRUs) for the Summit WM Controller WM200/
2000. It also provides procedures for removing, replacing, and verifying each FRU.
Summit WM Controller WM200/2000, AC-powered, redundant system
The power FRUs on an AC-powered redundant Summit WM Controller WM200/2000 system are two
AC-to-DC shelf power supply units (ACPCI) on the Summit WM Controller WM200/2000 shelf.

Fan Tray

The fan tray (Figure 12) is a plug-in unit for 19-inch houses and consists of two 12-Vdc fans. It is
suitable for on-site installation and replacement. An air current (from left to right) of 84 m3/h per fan is
sufficient. Each fan generates a square wave, open collector signal that is proportional to the fan speed.
The absence of this signal indicates a fan problem in the system. The fan tray is hot swappable. In order
to replace the fan tray, the two screws on the fan tray cover must be removed.
WARNING!
Exercise caution when removing fan trays. It is recommended to wait until the fans stop rotating before removing the
fan trays.
Figure 12 illustrates the fan model that is used: PAPST 3412 N/2.
Figure 12: Fan Tray
The fan trays are positioned on the left and right in the Summit WM Controller WM200/2000 shelf.
Each fan features three conductors (12 V, ground (GND), speed signal). The fan trays are connected to
the backplane by a connection cable.
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Summit WM Technical Reference Guide, Software Version 5.1