Lenovo NeXtScale n1200 Installation And Service Manual page 26

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AC power
DC power
LED (green)
LED (green)
Figure 10. 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 http://
www.ibm.com/systems/bladecenter/resources/powerconfig.html.
Notes:
• 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.
14
Lenovo NeXtScale n1200 Enclosure Installation and Service Guide
Power-supply
error LED (yellow)

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