3. Using both hands, slide the DC power supply straight into the chassis until the power supply is fully
seated in the chassis slot. The power supply faceplate must alligned with any adjacent power supply
faceplate or blank installed in the power supply slot.
4. Remove the clear plastic cover protecting the terminal on the faceplate.
5. Remove the screws from the terminals.
6. Secure each power cable lug to the terminal with the screw (see Figure 54 on page 134). Apply between
5 lb-in. (0.6 Nm) and 6 lb-in. (0.7 Nm) of torque to the screw. Do not overtighten the screw (use a
socket nut driver).
a. Secure the positive (+) DC source power cable lug to the RTN (return) terminal.
b. Secure the negative (–) DC source power cable lug to the –48V (input) terminal.
CAUTION: Ensure that each power cable lug seats flush against the surface of the
terminal block as you are tightening the screws. Ensure that each screw is properly
threaded into the terminal. Applying installation torque to the screw when improperly
threaded can result in damage to the terminal.
CAUTION: You must ensure that power connections maintain the proper polarity.
The power source cables might be labeled (+) and (–) to indicate their polarity. 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.
7. Replace the clear plastic cover over the terminals on the faceplate.
8. Verify that the power cabling is correct, that the cables do not touch or block access to router
components, and that they do not drape where people could trip on them.
9. Attach the power cable to the DC power source, and switch on the dedicated customer-site circuit
breaker. Follow the instructions for your site.
133
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