D-10
Cisco Content Delivery Engine 100/200/300/400 Hardware Installation Guide
OL-13478-03
Appendix D Connecting DC Power
Connecting DC Power to a CDE400
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Star washer
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PM 3 ground ring lug
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PM 4 ground ring lug
–
Star washer
–
Nut
Step 3 Attach the building ground wire to the building ground stud (see Figure D-4 on page D-4).
Warning
The DC ground connection in the CDE serves as a functional earth point to maintain the full EMI and
EMC integrity of the equipment. The purpose is to mitigate the damaging effects of electrostatic
discharge. This connection should be installed by a trained service person and the equipment is to be
installed per local code or local authority having jurisdiction (AHJ). The building ground wire should
not exceed 3 meters in length and be sized similarity to the conductors used for the DC power
connections (–48 VDC and +Return).
Step 4 Attach the +Return (red) and –48 VDC (black) DC power wires to your power source.
The CDE400 is now ready for use.
Disconnecting Power and Replacing a PM on a CDE400Warning
The PM connectors and PMs are not hot-swappable. You must disconnect the power source from the
building before disconnecting PM wires or removing PMs from a CDE.
Should you need to replace a PM, you must first disconnect DC power and remove the PM from the CDE
chassis. Perform the following steps:
Step 1 Remove the +Return (red) and –48 VDC (black) power wires from your power source.
Step 2 Remove the PM ground wires (green and yellow) from the PM ground studs.
Step 3 Loosen the screw on the PM to release it from the chassis. Pull the handle and gently slide the PM from
the slot.
Step 4 Insert a new PM in the slot and make sure it is completely seated in the CDE.
Step 5 Reconnect the PM ground wires (green and yellow) to the PM ground studs as described in Step 2 of the
“Connecting DC Power to a CDE400” section on page D-7.
Step 6 Reconnect the +Return (red) and –48 VDC (black) DC power wires to your power source.