Installing A 750-Watt -48 Volt To -60 Volt Dc Power Supply - Lenovo System x3750 M4 Installation And Service Manual

and the dc power LEDs are lit. For any other combination of LEDs, see "Power-supply LEDs" on
page 170. Make sure that no error LEDs are lit.
Step 9. Restart the server. Confirm that it starts correctly and recognizes the newly installed device, and
make sure that no error LEDs are lit.

Installing a 750-watt -48 volt to -60 volt dc power supply

Use this information to install a 750-watt -48 volt to -60 volt dc power supply.
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.ibm.com/systems/info/x86servers/serverproven/compat/us/.
Attention:
• Only trained service technicians, other than IBM 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.
• IBM 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 two dc power supplies or two ac power supplies in the server, but you cannot
mix dc and ac power supplies in the same server.
• 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).
• For the server to support two power supplies, you must install the optional Power Interposer for
Redundant Power option or the optional Microprocessor and Memory Expansion Tray, if one is not
installed in your model.
Statement 8
CAUTION:
Never remove the cover on a power supply or any part that has the following label attached.
Hazardous voltage, current, and energy levels are present inside
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Lenovo System x3750 M4 Installation and Service Guide