Before performing the following procedure, 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.
Do not mix AC and DC power supplies within the same device.
Damage to the device might occur.
Turn on the power to the external management device.
Attach an electrostatic discharge (ESD) grounding strap to your bare
wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Preventing
Electrostatic Discharge Damage.
Verify that the power
supplies are fully inserted in the chassis.
Verify that the source power cables are connected
to the appropriate terminal: the positive (+) source cable to the
return terminal (labeled RETURN) and the
negative (–) source cable to the input terminal (labeled –48V).
Switch on the dedicated facility circuit breakers
to provide power to the DC power cables.
Check the INPUT OK LED is lit steadily
green to verify that power is present.
If power is not present:
Verify that the fuse is installed correctly and turn on
the breaker at the battery distribution fuse board or fuse bay.
Check the voltage with a meter at the terminals of the
power supply for correct voltage level and polarity.
Switch the circuit breaker on each of the
power supplies to the ON position — and
observe the status LEDs on each power supply faceplate. If a DC power
supply is correctly installed and functioning normally, the PWR OK, BRKR ON, and INPUT OK LEDs
light green steadily.
If any of the status LEDs indicates that the power supply is
not functioning normally, repeat the installation and cabling procedures
described in Replacing Power System Components.
After powering off a power supply, wait at least 60 seconds
before turning it back on. After powering on a power supply, wait
at least 60 seconds before turning it off.
If the system is completely powered off when you power on the
power supply, the Routing Engine boots as the power supply completes
its startup sequence. If the Routing Engine finishes booting and you
need to power off the system again, see .
After a power supply is powered on, it can take up to 60 seconds
for status indicators—such as the status LEDs on the power supply and the show chassis command display—to
indicate that the power supply is functioning normally. Ignore error
indicators that appear during the first 60 seconds.
external management device connected to the Routing Engine, monitor
the startup process to verify that the system has booted properly.