Dell Unity™ All Flash and Unity Hybrid Hardware Information Guide

Power supply and cooling module functions and features

The power supply/cooling modules are located above and below the LCCs. The units integrate independent power supply and dual-blower cooling assemblies into a single module.

Each power supply is an auto-ranging, power-factor-corrected, multi-output, offline converter with its own line cord. Each supply supports a fully configured DAE and shares load currents with the other supply. The drives and LCCs have individual soft-start switches that protect the disk drives and LCCs if they are installed while the disk enclosure is powered up. The enclosure cooling system includes two dual-blower modules.

Power supply and cooling module connectors and LEDs

Figure 1 shows an example of the 3U 15 (3.5 inch) disk drive DAE AC power supply/cooling module with a power in (recessed) connector (plug) and status LEDs.

Table 1. 3U 15 disk drive DAE AC power supply/cooling module

Location	Description	Location	Description
	AC power in (recessed plug) connector		Power supply fault LED
	Cooling fault LED		Part number label
	Power supply on LED		Captive screw

Review Table 2 for the LED descriptions and status meanings.

Table 2. 3U 15 disk drive DAE AC power supply/cooling module LEDs

LED	Location	Color	State	Description
Cooling fault		Amber	On	Fault, one or both blowers not operating normally
		—	Off	No fault, blowers operating normally
Power supply on		Green	On	Power on
		—	Off	Power off
Power supply fault		Amber	On	Fault
			Blinking	During power shutdown and during overvoltage and undervoltage protection (OVP/UVP) fault
		—	Off	No fault or power off