■ Replacing the T640 Cable Restraint on a Three-Input 240-A Power
Supply on page 13
■ Connecting DC Power to a Three-Input 240-A Power Supply in a T640
Router on page 15
■ Powering On a T640 Three-Input 240-A Power Supply on page 17
Removing a T640 Three-Input 240-A Power Supply
To remove a three-input 240-A power supply:
1. Switch off the external 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. 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).
Figure 6: Three-Input 240-A Power Supply
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 or wrench, remove the nuts and washers
from the terminal studs (see Figure 7).
8 ■ Removing a T640 Three-Input 240-A Power Supply
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