Removing a T640 Four-Input 240-A DC Power Supply
The router has two redundant, load-sharing DC power supplies. Each power supply
is hot-insertable and hot-removable. When one power supply is powered down or
removed, the other power supply automatically assumes the entire electrical load
for the router.
To remove a four-input 240-A DC power supply:
1. Switch off the customer site circuit breakers to the power supply being removed.
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 the removal
process.
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.
3.
Switch the circuit breakers on the power supply faceplate to the off position (O).
Figure 15: Four-Input 240-A DC Power Supply
g004659
LEDs
Circuit breakers
NOTE: After powering off a power supply, wait at least 60 seconds before turning it
back on.
4. Remove the clear plastic cover protecting the terminal studs on the faceplate.
5. Using a 7/16-in. (11 mm) nut driver, remove the nuts and washers from the
terminal studs (see Figure 16).
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.
18 ■ Removing a T640 Four-Input 240-A DC Power Supply
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