Juniper MX204 - Page 30

• Only trained and qualied personnel must install or replace the router.
• Perform only the procedures described in this quick start or the MX204 Universal Roung Plaorm
Hardware Guide at hps://www.juniper.net/documentaon/. Other services should be performed by
authorized service personnel only.
• Read the installaon instrucons before you connect the router to a power source.
• Before installing the router, read the guidelines for site preparaon in the MX204 Universal Roung
Plaorm Hardware Guide at hps://www.juniper.net/documentaon/ to make sure that the site
meets power, environmental, and clearance requirements for the router.
• For the cooling system to funcon properly, the airow around the chassis must be unrestricted.
Allow at least 6 in. (15.2 cm) of clearance between side-cooled routers. Allow 2.8 in. (7 cm) between
the side of the chassis and any non-heat-producing surface such as a wall.
• When installing the router, do not use a ramp inclined more than 10 degrees.
• Manually installing the router requires two people for an empty chassis and three people for a fully
congured router to li the chassis. Before liing the chassis with only two people, remove the
components as described in the MX204 Universal Roung Plaorm Hardware Guide at hps://
www.juniper.net/documentaon/. To prevent injury, keep your back straight and li with your legs,
not your back. Do not aempt to li the chassis by the power supply handles.
• Mount the router at the boom of the rack if it is the only unit in the rack.
• When mounng the router in a parally lled rack, load the rack from the boom to the top with the
heaviest component at the boom of the rack.
• If the rack is provided with stabilizing devices, install the stabilizers before mounng or servicing the
router in the rack.
• When removing or installing an electrical component, always place it component-side up on a at
anstac surface or in an electrostac bag.
• When you install the router, always make the ground connecon rst and disconnect it last.
• Wire the DC power supply using the appropriate lugs. When connecng power, the proper wiring
sequence is ground to ground, +RTN to +RTN, then –48 V to –48 V. When disconnecng power, the
proper wiring sequence is –48 V to –48 V, +RTN to +RTN, then ground to ground. Always connect
the ground wire rst and disconnect it last.
• Do not work on the system or connect or disconnect cables during electrical storms.
• Before working on equipment that is connected to power lines, remove jewelry, including rings,
necklaces, and watches. Metal objects heat up when connected to power and ground and can cause
serious burns or become welded to the terminals.
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