NeXtScale n1200 Enclosure - Power supplies

The NeXtScale n1200 Enclosure supports six autoranging power supplies.

The following illustration shows the AC power supply:

Figure 1. Power supply front view

The AC power supplies get electrical power from a 100 - 127 V AC or 200 - 240 V AC power source and convert the AC input into 12 V outputs. The power supplies are capable of autoranging within the input voltage range. There is one common power domain for the chassis that distributes power to each of the nodes and modules through the system midplane.

AC redundancy is achieved by distributing the AC power cord connections between independent AC circuits.

When applying the power supplies redundancy policy through fan power control after the nodes are powered on, it may not be sufficient to allow N+1 or N+N configuration at current power supplies redundancy state. Before you change the power supplies redundancy policy, you may use the Power Configurator utility to determine current system power consumption. For more information and to download the utility, go to Lenovo Power Configurator download site.

Note:

Power supplies in the chassis must be with the same input voltage range, power rating, and certification category.
1300-watt power supplies support high-line Vin (AC 200V – 240V) only.

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.

The NeXtScale n1200 Enclosure 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 chassis 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 chassis that is powered by 100 - 127 V AC power supplies. If you install a 200 - 240 V AC power supply in a chassis that is powered by 100 - 127 V AC power supplies, the 200 - 240 V AC power supply will not power on.

Power supply controls and indicators

There are three LEDs on each power supply:

AC power LED: When this LED is lit (green), it indicates that AC power is being supplied to the power supply.
DC power LED: When this LED is lit (green), it indicates that DC power is being supplied from the power supply to the chassis midplane.
Fault LED: When this LED is lit (yellow), it indicates that there is a fault with the power supply.
Note: Before unplugging the AC power cord from the power supply or removing the power supply from the chassis, verify that the capacity of the remaining power supplies are sufficient to meet the minimum power requirements for all components in the chassis.