Lenovo System x3630 M4 Installation And Service Manual page 92

Note: You cannot mix 110 V ac and 220 V ac, or 550-watt, 750-watt and 900-watt power supplies in
the server, it is not supported.
• These power supplies are designed for parallel operation. In the event of a power-supply failure, the
redundant power supply continues to power the system. The server supports a maximum of two
power supplies.
• The server can run fully configured with one power supply. For redundancy support, you must install
the second hot-swap power supply.
Note: You cannot mix high-efficiency and non-high-efficiency power supplies in the server.
Statement 5
CAUTION:
The power control button on the device and the power switch on the power supply do not turn off
the electrical current supplied to the device. The device also might have more than one power
cord. To remove all electrical current from the device, ensure that all power cords are disconnected
from the power source.
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 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.
Attention: During normal operation, each power-supply bay must contain either a power supply or
power-supply filler for proper cooling.
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Lenovo System x3630 M4 Installation and Service Guide