Lenovo x3550 M4 Installation And Service Manual page 88

v Power supply 1 is the default/primary power supply. If power supply 1 fails,
v You can order an optional power supply for redundancy.
v These power supplies are designed for parallel operation. In the event of a
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.
To install a hot-swap ac power supply, complete the following steps:
Procedure
70
System x3550 M4 Type 7914: Installation and Service Guide
you must replace the power supply with the same wattage immediately.
power-supply failure, the redundant power supply continues to power the
system. The server supports a maximum of two power supplies.
1. Read the safety information that begins on "Safety" on page vii and
"Installation guidelines" on page 33.