• Supported Platforms
• T1600 Routers

• Related Topics
• Installing a T1600 Three-Input 240-A DC Power Supply
• T1600 Preventing Electrostatic Discharge Damage.
• T1600 Power System Description
• Troubleshooting the T1600 Power System

Connecting a Replacement T1600 Three-Input 240-A Power Supply

To connect a three-input 240-A power supply to the power sources:

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
2. Verify that a licensed electrician has attached cable lugs to the power cables that you supply.
3. Verify that the voltage across the DC power source cables leads is 0 V and that there is no chance that the cables might become active during installation. If needed, switch off the customer site circuit breakers.
4. Verify that the circuit breakers on the power supply faceplate are in the OFF position (O).
5. Remove the clear plastic cover protecting the terminal studs on the faceplate.
6. Remove the nut and washer from each power terminal stud.

   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. Attach the lugs on the DC source power cables to the terminal studs.
   1. Attach the positive (+) DC source power cable lugs to the RETURN (return) terminals.
   2. Attach the negative (–) DC source power cable lugs to the –48V (input) terminals.

   Secure the cable lugs to the terminal studs, first with a washer, then with a nut (see Figure 1). Use a 7/16-in. (11-mm) nut driver to tighten the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.

   Caution: You must use an appropriate torque-controlled tool to tighten the nuts. Applying excessive torque damages the terminal studs and the power supply. The absolute maximum torque that may be applied to this nut is 45 in-lb (5.0 Nm).

   Note: For power supplies set to 3-INPUT mode (required for the T1600 router), connect two DC power cables, one for RETURN and one for -48 V, to each of the three inputs.

8. Loosen the captive screw or screws on the cable restraint on the right edge of the power supply faceplate.
9. Route the DC power cables through the cable restraint.
10. Tighten the cable restraint captive screw or screws to hold the power cables in place.
11. Verify that the ground and power cabling are correct, that they are not touching or blocking access to other hardware components, and that they do not drape where people could trip on them.
12. Replace the clear plastic cover over the terminal studs on the faceplate.