Owners Manual

Removing a PSU
Before removing the PSU, disconnect the power from the PSU by either the mains switch (where present) or by physically
removing the power source in order to ensure your system has warning of imminent power shutdown. Make sure that you
correctly identify the faulty PSU before beginning the step procedure.
CAUTION: Removing a power supply unit significantly disrupts the enclosure’s airflow. Do not remove the PSU
until you have received the replacement module. It is important that all slots are filled when the enclosure is in
operation.
1. Stop all I/O from hosts to the enclosure. See Shutting down a controller module on page 45.
NOTE: This step is not required for hot-swapping. However, it is required when replacing both PSUs at once.
2. Use management software to shut down any other system components necessary.
NOTE: This step is not required for hot-swapping. However, it is required when replacing both PSUs at once.
3. Verify the Power OK LED is lit, then switch off the faulty PSU, and disconnect the power supply cable.
4. If replacing a single PSU via hot-swap, proceed to step 6.
5. If replacing both PSUs, verify that the enclosure was shut down using management interfaces, and that the enclosure is
powered off.
6. Verify that the power cable is disconnected.
7. Push the release latch to the right and hold it in place (detail No.1).
8. With your other hand, grasp the handle and pull the PSU outward (detail No.2).
Figure 58. Removing a PSU (1 of 2)
Figure 59. Removing a PSU (2 of 2)
9. While supporting the PSU with both hands, remove it from the enclosure.
10. If replacing both PSUs, repeat steps 5 through 9.
NOTE: The PSU slot must not be empty for more than 2 minutes while the enclosure is powered.
68 Module removal and replacement