1. Make sure that the voltage across the DC power source cable leads is 0 V and
that there is no chance that the cables might become active during installation.
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.
2. 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 to an M Series, MX
Series, or T Series Routing Platform.
3.
Switch the circuit breakers on the power supply faceplate to the off position (O).
4. Using both hands, slide the power supply into the chassis until you feel resistance.
5. Twist the ejector handles at the upper corners of the power supply faceplate
clockwise until they stop.
6. Tighten the captive screws at the lower corners of the power supply faceplate
to secure the power supply in the chassis.
7. Remove the clear plastic cover protecting the terminal studs on the faceplate.
8. Remove the nut and washer from each power terminal stud. If no washers and
nuts are already installed, they should be in the accessory box.
9. Secure the cable lug on the DC power cable to the terminal stud, first with a
washer, then with a nut (see Figure 5). Use a 7/16-in. (11 mm) nut driver or
wrench to tighten the nut (see Figure 4). Apply between 23 lb-in. (2.6 Nm) and
25 lb-in. (2.8 Nm) of torque to each nut:
a.
Secure each positive (+) DC source power cable lug to a RTN (return)
terminal.
b.
Secure each negative (–) DC source power cable lug to a –48V (input) terminal.
NOTE: All inputs on the two-input 160-A DC power supply in slot PEM0 must be
powered by dedicated power feeds derived from feed A, and all inputs on the
two-input 160-A DC power supply in slot PEM1 must be powered by dedicated power
feeds derived from feed B. This configuration provides the commonly deployed A/B
feed redundancy for the system.
NOTE: INPUT 0 and INPUT 1 on the three-input 240-A DC power supply in slot PEM0
must be powered by dedicated power feeds derived from feed A, and INPUT 0 and
INPUT 1 on the three-input 240-A DC power supply in slot PEM1 must be powered
by dedicated power feeds derived from feed B. This configuration provides the
commonly deployed A/B feed redundancy for the system.
Installing a T640 Two-Input Power Supply ■ 5
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