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• Connect the equipment to a properly grounded safety extra low voltage (SELV) source. A SELV
source is a secondary circuit that is designed so that normal and single fault conditions do not
cause the voltages to exceed a safe level (60 V direct current).
• Incorporate a readily available approved and rated disconnect device in the field wiring.
• See the specifications in the product documentation for the required circuit-breaker rating for
branch circuit overcurrent protection.
• Use copper wire conductors only. See the specifications in the product documentation for the
required wire size.
• See the specifications in the product documentation for the required torque values for the
wiring-terminal screws.
Note: In Statement 34 above:
• Replace IEC 60950-1, First Edition with IEC 60950-1, Second Edition Amendment 1.
• The required circuit breaker rating is 20 amps.
DC power supply unit connectors and indicators
Each enclosure can contain two DC power supply units. Each power supply unit can provide power to the
whole enclosure.
The power supply units have the components that are shown in Figure 8 on page 18.
Figure 8. DC power supply unit connectors and indicators
1
Release tab
2
Handle
3
Power supply LED indicators
4
Direct current power connector
5
Cable retainer
Each power supply also contains fans that cool the enclosure. Cool air is drawn in through the front of the
enclosure. The air passes over the drives, node canisters, and power supplies. The warmed air is ejected
through the rear of each power supply. For optimal cooling, do not obstruct the airflow and ensure that all
enclosure components or fillers are installed while the system is operational.
DC power supply LED indicators
Each power supply unit has four LED indicators. Table 19 on page 18 summarizes their possible values
and meaning.
The LEDs have a comparable meaning to the LEDs on the AC power supply. Problem diagnosis and service
procedures are the same. For details, see "Powering on the system" on page 72.
Table 19. DC power supply LED indicators
Name
Label
Input
status
18 IBM Storwize V5000E : Storwize V5000E Quick Installation Guide
Color
State
Description
Green OFF
No input power detected.
ON
DC input power detected.
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