Lenovo 6241, Installation And Service Manual

Page: 116 / 1990

Table 28. Support configurations when mixing 900-watt and 1400-watt ac power supplies for each 4-socket node
(continued)
Power supply bay number Power supply wattage
Bays 1 and 4 900-watt
Bays 2 and 3 1400-watt
OR
Bays 1 and 4 1400-watt
Bays 2 and 3 900-watt
Installing a 750-watt -48 volt to -60 volt dc power supply
Use this information for considerations that you need note when you install 750-watt -48 volt to -60 volt dc
power supplies and the instructions for installing the 750-watt -48 volt to -60 dc power supplies in the server.
Notes:
• This information apply to both the 4-socket and 8-socket servers.
• Four 750-watt -48 dc power supplies is the only 750-watt -48 volt dc power supply configuration that the
server supports (per 4-socket node).
• Four 750-watt hot-swap power supplies fed from a -48 volt to -60 volt dc input source provides N+N
redundancy support for limited configurations.
• For more notes and information that you must consider when you install power supplies in the server, see
“Installing power supplies” on page 100.
The following notes provides information that you must consider when you install a 750-watt -48 V to -60 V
dc power supply. To confirm that the server supports the power supply that you are installing, see
http://
www.lenovo.com/serverproven/
.
Attention:
• Only trained service technicians, other than Lenovo approved service technicians, are authorized to install
and remove the 750-watt -48 V to -60 V dc power supply, and make connections to or disconnections
from the 750-watt -48 V to -60 V dc power source.
• Lenovo service technicians are not certified or authorized to install or remove the 750-watt -48 V to -60 V
dc power cable. You are responsible for ensuring that only a trained service technician install or remove
the 750-watt -48 V to -60 V dc power cable.
• You can install up to four dc power supplies (per 4-socket node) or four ac power supplies (per 4-socket
node) in the server, but you cannot mix dc and ac power supplies in the same server.
• The power supply bays are divided into two power domains (each 4-socket node). Power supply bays 1
and 3 are in power domain A and power supply bays 2 and 4 are in power domain B.
• To reduce the risk of electric shock or energy hazards when installing the 750-watt -48 V to -60 V dc
power supplies, take the following steps:
– Use a circuit breaker that is rated 40 amps.
– Use 4 mm2 (10 AWG) at 60° C copper wire.
– Cut the power cable wires to the correct length, but do not cut the wires shorter than 150 mm (6
inches).
– Torque the wiring-terminal screws to 0.50 ~ 0.60 newton-meters (4.43 ~ 5.31 inch-pounds).
Statement 8
102
System x3850 X6 and x3950 X6 Installation and Service Guide