User`s guide

38 • Chassis and Blade Installation R Series Data Center Products User’s Guide, Rev. B
corresponding holes as the back ears, so that the rack bracket is level. To
remove, pull the finger tab inward with your finger and slide the ears forward.
5. Repeat steps 2 and 3 with the other chassis bracket on the opposite side of the rack,
in mirrored orientation. Ensure that the brackets are level with respect to each other.
6. Slide the chassis and brackets onto the rack brackets from the front. Ensure the
“U” channels on the chassis bracket engage the flanges on the rack bracket.
7. Slide the chassis all the way onto the rack brackets until flush with the front of the
rack.
8. Fully tighten the thumb screws with a Phillips head screwdriver.
9. Attach the AC power cord(s) packaged and supplied with the chassis and route it
to the back panel power connector(s) and then to a surge-protected power source
such as an uninterruptible power supply. Use the cable retention clamp on the
chassis to avoid inadvertently disconnecting the power.
The cabling and module installation notes from the previous section, Standard
Chassis Mounting Hardware, apply to this procedure.
Chassis Power Requirements
The R4300 chassis has two internal Power Supply Units (PSUs) and two power
receptacles that provide independent power sources when plugged into separate circuits.
The Direct Connect and Switching BackPacks have a single power cord that feeds
both internal PSUs.
If only one power cord is connected to the R4300 chassis, it is powered only by a
single circuit, although both PSUs are active and supply power to the chassis. In order
to have redundant AC inputs, and provide the chassis with the greatest reliability,
each power input must be connected to a separate power source.
Use the AC power cord packaged and supplied with the chassis. For systems shipped
to countries that utilize a 100–130-volt power system, the power cord is rated at 15
amps. Systems shipped to countries with a 208–240-volt power systems are
packaged with power cords rated at 10 amps. Older model chassis utilized 10
amp-rated power cords that are NOT approved for use with current model chassis on
100–130-volt power systems. The standard 10 amp power cords are acceptable for
use with the Fiber Transceiver. Refer to the Safety Guidelines on page 7 for more
information.
NOTE: The maximum steady-state current draw of a single fully loaded chassis
ranges between 6 and 8 amps at 120 VAC, based on the level of user activity.
The peak initial current draw is 12 amps. If you are placing multiple chassis on
a single power circuit, make sure that the circuit can safely handle the
combined currents of all the equipment. Therefore, if you place two chassis
on a single branch circuit, it must be able to support a peak current of 25
amps at 120 VAC.
CAUTION: Make sure your power strips, power grid, and circuit breakers
can safely provide the required current. Ensure that any extension cords
used meet local safety regulations and fire codes. When specifying
uninterruptible power supplies (UPS) be sure to include the Fiber
Transceiver peak current draws in your calculations to ensure the UPS
has adequate capacity.