CAUTION: DO NOT mix airflow directions. The airflow directions are color coded. A red label indicates that hot air is
expelled from the PSU and a blue label indicates that hot air is expelled from the I/O. Both power supplies must use the
same airflow direction (I/O to Utility or Utility to I/O). The power supplies and fans must have the same color strap. If
you mismatch the airflows, the following error message appears and the system shuts down:
00:02:19: %S5000:0 %CHMGR-2-PSU_TYPE_AIRFLOW_MISMATCH: Mismatching PSU airflow detected.
Unit 0 shall get shutdown in next 60 seconds if mismatch not rectified. 00:02:19:
%STKUNIT0-M:CP %CHMGR-1-PSU_AIRFLOW_COMBO_MISMATCH: Major alarm: Mismatching PSU airflow
detected in unit 0
Installing an AC Power Supply
1. Remove the PSU from the electro-static bag.
2. Use the grab handle to slide the PSU into the switch PSU slot (install the PSU-exposed PCB edge connector first). The PSU slot is
keyed so that the PSU can be fully inserted in only one way. When you install the PSU correctly, it snaps into place and is flush with
the back of the switch.
Figure 15. Installing an AC Power Supply
a. Slot 0 (for AC PSU 0)
b. Release latch
3. Plug in the AC3 prong cord from the switch PSU to the external power source (the AC wall outlet).
Installation
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