• Supported Platforms
• T320 Routers

• Related Topics
• T320 Power System Description
• Maintaining the T320 Power Supplies
• T320 Power System Electrical Specifications
• Site Electrical Wiring Guidelines for M Series and T Series Routers

Removing a T320 DC Power Supply

The power supplies are located at the rear of the chassis below the SIBs. Each power supply weighs approximately 12 lb (5.4 kg).

Caution: Do not leave a power supply slot empty for more than 30 minutes while the router is operational. For proper airflow, the power supply must remain in the chassis, or a blank panel must be used in an empty slot.

Note: After powering off a power supply, wait at least 60 seconds before turning it back on.

To remove a power supply:

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 the removal process.

   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 Router.
3. Switch the circuit breaker on the power supply faceplate to the off position (O).
4. Remove the clear plastic cover protecting the terminal studs on the faceplate.
5. Remove the nuts and washers from the terminal studs (see Figure 1). (Use a 7/16–in. nut driver or pliers.)

   Figure 1: Disconnecting Power Cables from the DC Power Supply

   

6. Remove the cable lugs from the terminal studs.
7. Loosen the captive screws on the cable restraint on the right edge of the power supply faceplate.
8. Carefully move the power cables out of the way.
9. Loosen the captive screws on the lower corners of the power supply faceplate completely. Twist the ejector handles on the upper corners of the faceplate counterclockwise to unseat the power supply.
10. Twist the ejector handles on the upper corners of the faceplate counterclockwise to unseat the power supply.
11. Grasp the handle on the power supply faceplate and pull firmly to start removing the power supply. Slide it halfway out of the chassis (see Figure 2).

    Warning: Do not touch the power connectors on the rear of the power supply (see Figure 3). They can contain dangerous voltages.

12. Place one hand underneath the power supply to support it and slide it completely out of the chassis.

    Caution: Each power supply weighs approximately 12 lb (5.4 kg). Be prepared to support the full weight of the power supply as you remove it from the router.