User guide

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Power unit
This section explains how to replace a power unit. A power unit can be replaced even if the blade
enclosure is powered on.
1. Confirm which power unit you are replacing.
2. If the power unit is not redundantly configured, power off all the CPU blades installed in the
target slot.
Important
 To remove a power unit in a non-redundant configuration, power off all devices on the
blade enclosure.
 Quickly replace a power unit if the blade enclosure is powered on. If you use the blade
enclosure with a power unit removed, the cooling efficiency will degrade. Make sure to
install a power unit or power unit slot cover.
3. Remove the power unit. See "Installing a power unit."
4. Install a power unit in the slot. Refer to "Installing a power unit." When a power unit is
added, install a power cord in the AC inlet and connect it to a power tap or UPS. For
information on how to install a power cord, refer to "Connecting cables.")
5. Make sure that the power LED of the power unit is green, which shows the power unit is
working normally, and that the power alarm LED is off, which shows the power unit is
working normally.
6. Confirm that the installed power unit is recognized by the EM card. Refer to "Checking
operational status."