Removing An M40E Dc Power Supply - Juniper M40E Hardware Manual

M40e Multiservice Edge Router Hardware Guide
216
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down, the other power supply automatically assumes the entire electrical load for the
router.
Removing an M40e DC Power Supply on page 216
Installing an M40e DC Power Supply on page 217

Removing an M40e DC Power Supply

The DC power supplies are located at the bottom rear of the chassis, as shown in "M40e
Chassis Description" on page 8. Each DC power supply weighs approximately 13 lb
(5.9 kg).
CAUTION: Do not leave a power supply slot empty for more than 30 minutes
while the router is operational. For proper airflow, the power supply must
remain in the chassis, or a blank panel must be used in an empty slot.
To remove a DC power supply (see Figure 120 on page 217):
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis. For more information about ESD,
see "Preventing Electrostatic Discharge Damage to an M Series, MX Series, or T Series
Router" on page 232.
Press the power switch for the power supply (located on the circuit breaker box) to
2.
the ( ) position.
OFF O
NOTE: If you are power cycling the power supply rather than shutting it
off for a time, wait at least 60 seconds after turning it off before turning
it back on. If you need to power it off again, wait for at least 60 seconds
after powering it on.
Shut off the power flowing to the power supply from the external power source, so
3.
that the voltage across the leads of the power cables is 0 V. Ensure that there is no
chance that the cable leads might become active during the procedure.
Loosen the thumbscrew at each corner of the power supply faceplate, using a Phillips
4.
screwdriver if necessary.
Grasp the handle or handles on the power supply faceplate and pull firmly to slide
5.
the unit about halfway out of the chassis.
Place one hand under the power supply to support it, then slide it completely out of
6.
the chassis.
WARNING: Do not touch the power connectors on the rear of the power
supply (see Figure 121 on page 217). They can contain dangerous voltages.
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