Juniper MX960 Hardware Manual page 426

MX960 3D Universal Edge Router Hardware Guide
396
NOTE: The minimum number of power supplies must be present in the router
at all times.
WARNING: Before performing DC power procedures, ensure that power is
removed from the DC circuit. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the circuit
breaker to the off position, and tape the switch handle of the circuit breaker
in the off position.
CAUTION: To maintain proper cooling and prevent thermal shutdown of the
operating power supply unit, each power supply slot must contain either a
power supply or a blank panel. If you remove a power supply, you must install
a replacement power supply or a blank panel shortly after the removal.
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on.
To remove a DC power supply (see
Switch off the dedicated customer site circuit breaker for the power supply being
1.
removed. Follow your site's procedures for ESD.
Make sure that the voltage across the DC power source cable leads is 0 V and that
2.
there is no chance that the cables might become active during the removal process.
Verify that the
INPUT OK
3.
Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
4.
ESD points on the chassis.
Move the DC circuit breaker on the power supply faceplate to the off (
5.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
6.
Remove the nut and washer from each of the terminal studs. (Use a 7/16-in.
7.
[11 mm] nut driver or socket wrench.)
Remove the cable lugs from the terminal studs.
8.
Figure 164 on page
LEDs on the power supply to be removed are not lit.
398):
) position.
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