Lenovo ThinkSystem SR645 V3 User Manual page 112

S029
DANGER
For -48V dc power supply, electrical current from power cords is hazardous.
To avoid a shock hazard:
• To connect or disconnect -48V dc power cords when you need to remove/install redundancy
power supply unit(s).
To Connect:
1. Turn OFF subject dc power source(s) and equipment
(s) that are attached to this product.
2. Install the power supply unit(s) into the system
housing.
3. Attach dc power cord(s) to the product.
• Ensure correct polarity of -48 V dc connections:
RTN is + and -Vin (typical -48 V) dc is -. Earth
ground should be connected very well.
4. Connect dc power cord(s) to subject power source
(s).
5. Turn ON all the power source(s).
Attention:
• Read "Installation Guidelines" on page 35
work safely.
• Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-
sensitive components in their static-protective packages until installation, and handling these devices with
an electrostatic-discharge wrist strap or other grounding system.
Watch the procedure
A video of this procedure is available at YouTube:
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Procedure
Step 1. Touch the static-protective package that contains the hot-swap power supply to any unpainted
surface on the outside of the server. And then, take the hot-swap power supply out of the package
and place it on a static-protective surface.
Step 2. If there is a power-supply filler installed, remove it.
ThinkSystem SR645 V3 User Guide
102
and "Safety inspection checklist" on page 36
.
To Disconnect:
1. Disconnect or turn off the subject dc power source(s)
(at the breaker panel) before removing the power
supply unit(s).
2. Remove the subject dc cord(s) and make sure the
wire terminal of power cord(s) is insulated.
3. Unplug the subject power supply unit(s) from the
system housing.
https://www.youtube.com/playlist?list=PLYV5R7hVcs-
to ensure that you