Lenovo ThinkEdge SE455 V3 User Manual page 184

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).
S035
CAUTION:
Never remove the cover on a power supply or any part that has this label attached. Hazardous voltage,
current, and energy levels are present inside any component that has this label attached. There are no
serviceable parts inside these components. If you suspect a problem with one of these parts, contact
a service technician.
About this task
Attention:
• Read "Installation Guidelines" on page 39
work safely.
• If applicable, remove the security bezel. See
• Power off the server and peripheral devices and disconnect the power cords and all external cables. See
"Power off the server" on page
• If the server is installed in a rack, remove the server from the rack. See
on page 49.
• Make sure you have a power supply unit filler available if some power supply bays will be left empty after
the removal.
Procedure
Step 1. Press and hold the terra-cotta release tab.
Step 2. Grasp the handle, and pull the power supply unit out of the server.
176 ThinkEdge SE455 V3 User Guide
To Disconnect:
1. Disconnect or turn off the subject dc power source(s)
2. Remove the subject dc cord(s) and make sure the
3. Unplug the subject power supply unit(s) from the
and "Safety inspection checklist" on page 40
"Remove the security bezel" on page
48.
(at the breaker panel) before removing the power
supply unit(s).
wire terminal of power cord(s) is insulated.
system housing.
"Remove the server from the rack"
to ensure that you
195.