Lenovo ThinkSystem NE2572 Installation Manual page 28

28
NE2572 Installation Guide
To Connect:
1.Turn OFF all power sources and
equipment that is to be attached to
this product.
2.Attach signal cables to the
product.
3.Attach power cords to the
product.
For ac systems, use appliance

inlets.
For dc systems, ensure correct

polarity of -48 V dc connections:
RTN is + and -48 V dc is -. Earth
ground should use a two-hole
lug for safety.
4.Attach signal cables to other
devices.
5.Connect power cords to their
sources.
6.Turn ON all the power sources.
Two power supply modules are required for redundancy. Each power supply can
be connected to a separate circuit to mitigate the risk of down-time during a
localized power failure. When used in a redundant configuration, the dual power
supplies have a load-sharing capability that enables each power supply to operate
at approximately 50 percent of full load.
Using redundant power can minimize the power disruption during a power supply
failure and extend the expected lifetime of each power supply by operating
normally in a conservative power mode.
For proper airflow when operating the switch with only one power supply module,
the empty power supply bay must be protected by a blank cover module.
There is no power switch on the NE2572 power modules; the switch powers up
when power is supplied through the power cord to one or both power supplies.
To Disconnect:
1.Turn OFF all power sources and
equipment that is to be attached to
this product.
For ac systems, remove all power

cords from the chassis power
receptacles or interrupt power at
the ac power distribution unit.
For dc systems, disconnect dc

power sources at the breaker
panel or by turning off the power
source. Then, remove the dc
cables.
2.Remove the signal cables from the
connectors.
3.Remove all cables from the
devices.