Lenovo System x3550 M4 Installation And Service Manual page 272

Step 4. Attach the dc power cable to the new power supply.
Figure 172. DC power supply rear view
Step 5. If you are installing a hot-swap power supply into an empty bay, remove the power-supply filler
from the power-supply bay.
Figure 173. Power supply installation
Step 6. Grasp the handle on the rear of the power supply and slide the power supply forward into the
power-supply bay until it clicks. Make sure that the power supply connects firmly into the power-
supply connector.
Step 7. Route the power cord through the handle and cable tie if any, so that it does not accidentally
become unplugged.
Step 8. Connect the other ends of the dc power cable to the dc power source. Cut the wires to the correct
length, but do not cut them shorter than 150 mm (6 inch). If the power source requires ring
terminals, you must use a crimping tool to install the ring terminals to the power cord wires. The
ring terminals must be UL approved and must accommodate the wires that are described in
"Regulations" on page 255. The minimum nominal thread diameter of a pillar or stud type of
terminal must be 4 mm; for a screw type of terminal the diameter must be 5.0 mm.
Step 9. Turn on the circuit breaker for the dc power source to which the new power supply is connected.
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Lenovo System x3550 M4 Installation and Service Guide