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transferred from the old controller module to the replacement. Instructions for replacing
a controller module have been given in Section 5.3.3 above.
5.4. Replacing a Failed PSU Module
5.4.1 Notes on PSU Module Maintenance
♦
Two redundant PSU modules - The ES comes with two fully redundant, hot-
swappable PSU modules. These modules are located at the rear of the subsystem.
♦
Immediate Replacement - When a PSU fails it should ideally be replaced
immediately. Do not remove the PSU module unless a replacement is readily
available. Removing a PSU without a replacement will cause severe disruptions to
the internal airflow and the subsystem will over heat possibly causing irreparable
damage to some of the subsystem components.
5.4.2 Replacing the PSU Module
To replace a PSU please follow these steps:
1. Turn off the PSU. The power switch is located at the top of the rear panel, directly
above the PSU module. (See Figure 5-4)
2. Once the power switch has been turned off, remove the power cable that connects
the ES U16U subsystem to the mains. The power cable socket is found on the left-
hand side.
3. After the power cable has been removed from the socket, remove the retention
screw that is found on the right hand side of the PSU. (See Figure 5-4.)
Replacing a Failed PSU Module
WARNING:
Although the PSU modules are fully redundant, it is not advisable to run the
EonStor subsystem with a single PSU module for a long period of time. If the
second PSU module fails the sub-system will be shut down..
Chapter 5: Subsystem Maintenance
5-9
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