Replacing A Hot-Swap Dc Power Supply - Lenovo NeXtScale n1200 Installation And Service Manual

Figure 28. Power supply removal
If you are instructed to return the power supply, follow all packaging instructions, and use any packaging
materials for shipping that are supplied to you.

Replacing a hot-swap DC power supply

To install a hot-swap DC power supply, complete the following steps.
• Only trained service personnel other than Lenovo service technicians are authorized to install and remove
the -48 volt DC power supply, and make the connections to and disconnections from the -48 volt DC
power source. Lenovo service technicians are not certified or authorized to install or remove the -48 volt
power cable. The customer is responsible for ensuring that only trained service personnel install or
remove the -48 volt power cable.
• Before you install a DC power supply in the server, you must remove all AC power supplies. Do not use
both AC and DC power supplies in the same server. Install six DC power supplies or six AC power
supplies, but not a combination.
• If you need to order more ferrite clamp cores, the part number is 94Y8175.
Regulations
• It is the customer's responsibility to supply the necessary power cable.To reduce the risk of electric
shock or energy hazards:
– Use a circuit breaker that is rated at 70 amps.
2
– Use 4 mm (10 AWG) at 90° C copper wire.
– Torque the wiring-terminal screws to 0.50 ~ 0.60 newton-meters (4.43 ~ 5.31 inch-pounds).
For more information, see Statement 34.
• 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 wire that is
described in the above-mentioned note.
• To avoid radiated emission, you must attach a clamp core for each of the 900 W DC power supply used.
Power supply
.
Chapter 4 Removing and replacing components
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