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AC power supply unit or cooling fan module
Your enclosure supports two hot-swappable power supply unit or cooling fan modules. While the
enclosure can operate temporarily with one module, both the modules must be present for cooling the
enclosure.
CAUTION: A single power supply unit or cooling fan module can be removed from a turned on
enclosure for a maximum period of five minutes. Beyond that time, the enclosure may
automatically shut down to prevent damage.
Removing an AC power supply unit or cooling fan module
NOTE: If you remove a fully functioning power supply or cooling fan module, the fan speed in the
remaining module increases significantly to provide adequate cooling. The fan speed decreases
gradually when a new power supply or cooling fan module is installed.
1. Turn off the power supply unit or cooling fan module.
2. Disconnect the power cable from the power source.
3. Remove the Velcro straps that secure the power cable and then disconnect the power cable from
the power supply or cooling fan module.
WARNING: The power supply unit or cooling fan modules are heavy. Use both hands while
removing the module.
4. Press the release tab and pull the power supply out of the chassis.
Figure 13. Removing and installing a power supply unit or cooling fan module
1. release tab 2. power supply unit
3. EMM or Power Supply Cage
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