Dell EMC ME4084 Owner's Manual page 17

Figure 24. 5U84 expansion enclosure—rear panel components
1. IOM slot A
3. FCM slot 0
5. FCM slot 2
7. FCM slot 4
9. PSU slot 1
NOTE: 5U84 controller enclosures support dual-controller module configuration only. If a partner controller module
fails, the controller will fail over and run on a single controller module until the redundancy is restored. Both controller
module slots must be occupied to ensure sufficient airflow through the controller during operation.
5U84 rear panel components
This section describes the rear-panel controller modules, expansion module, power supply module, and fan cooling module.
Controller modules
The 5U84 controller enclosure uses the same controller modules that are used by 2U12 and 2U24 enclosures.
Expansion module
The 5U84 expansion enclosure uses the same IOMs that are used by 2U12 and 2U24 enclosures.
Power supply module
This figure shows the power supply unit that is used in 5U controller enclosures and optional 5U84 expansion enclosures.
Figure 25. Power supply unit (PSU)
1. Module release latch
3. PSU Fault LED (Amber/blinking amber)
5. Power OK LED (Green)
7. Power switch
LED behavior:
• If any of the PSU LEDs are illuminated amber, a module fault condition or failure has occurred.
• For a detailed description of PSU LEDs, see
2. IOM slot B
4. FCM slot 1
6. FCM slot 3
8. PSU slot 0
2. Handle
4. AC Fail LED (Amber/blinking amber)
6. Power connect
Table 16. FCM LED descriptions.
Storage system hardware 17