Lenovo 5468 Setup Manual page 24

AC redundancy is achieved by distributing the ac power cord connections between independent ac circuits.
Each power supply has internal fans and a controller. The power supply controller can be powered by any
installed power supply that is providing power through the midplane.
Attention: The power supplies contain internal cooling fans. Do not obstruct the fan exhaust vents.
You have to install all of the six power supplies regardless of the type of power supply, the enclosure power
load, or selected enclosurepower policy.
The NeXtScale n1200 DWC Enclosure Type 5468 does not support mixing of low input voltage power
supplies with high input voltage power supplies. For example, if you install a power supply with an input
voltage of 100 - 127 V ac in a enclosure that is powered by 200 - 240 V ac power supplies, the 100 - 127 V
power supply will not power on. The same restriction applies to a enclosure that is powered by 100 - 127 V
ac power supplies. If you install a 200 - 240 V ac power supply in a enclosure that is powered by 100 - 127 V
ac power supplies, the 200 - 240 V ac power supply will not power on.
The following illustration shows the power supply:
Figure 10. Power supply LEDs and connectors
1
Input (AC) power LED (green)
2
Output (DC) power LED (green)
There are three LEDs on each power supply:
1
AC power LED (green): When this LED is lit (green), it indicates that ac power is being supplied to the
power supply.
2 DC power LED (green): When this LED is lit (green), it indicates that dc power is being supplied from the
power supply to the enclosure midplane.
20
ThinkSystem SD650 Dual Node DWC Tray and NeXtScale n1200 DWC Enclosure Setup Guide
3
Power supply error LED (yellow)