Connecting DC Power to a Three-Input 240-A Power Supply in a T640
Router
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. For more information
about ESD, see Preventing Electrostatic Discharge Damage to an M Series, MX
Series, or T Series Routing Platform.
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. Secure the cable lugs to the terminal studs, first with a washer, then with a nut
(see Figure 14).
a.
Attach the positive (+) DC source power cable lugs to the RETURN (return)
terminals.
b.
Attach the negative (–) DC source power cable lugs to the –48V (input)
terminals.
Use a 7/16-in. (11-mm) nut driver or wrench to tighten the nut. Apply between
23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.
NOTE: For power supplies set to 2-INPUT mode (required for the T640 routing node),
connect two DC power cables, one for RETURN and one for -48 V to Input 0 and two
DC power cables, one for RETURN and one for -48 V to Input 1.
Connecting DC Power to a Three-Input 240-A Power Supply in a T640 Router ■ 15
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