Replacing a DC Power Supply Cable

To replace a power cable for a DC power supply:

1. Locate a replacement power cable and a lug that meet the specifications defined in Chassis Grounding and DC Power, Connection, and Power Cable Specifications.

   A licensed electrician must attach a cable lug to the power cable that you supply. A cable with an incorrectly attached lug can damage the router (for example, by causing a short circuit).

2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to the ESD point on the chassis, or to an outside ESD point if the router is disconnected from earth ground. For more information about ESD, see Preventing Electrostatic Discharge Damage.
3. Press and release the power button to power off the Services Router. Wait for the POWER LED to turn off.
4. Ensure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cable leads might become active during installation.

   There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply. You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity.

5. Remove the power cable from the DC power source.
6. Use a Phillips screwdriver to remove the clear plastic cover protecting the terminal block.
7. Within the terminal block, remove the screw that fastens the power cable lug to the terminal block.
8. Carefully move the power cable out of the way.
9. Using the removed screw, secure the replacement power cable to the appropriate terminal.

   The screw contains a captive washer used to secure the power cable lug to the terminal block.

   Each power supply must be connected to a dedicated DC power feed. For information about connecting to DC power sources, see Connecting Power to the Services Router.

10. Dress the power cable appropriately.
11. Replace the clear plastic cover over the terminal block.
12. Verify that the power cable does not block access to router components or drape where people might trip on it.
13. Press and release the power button to power on the router. Verify that the POWER LED lights steadily after you press the power button.