Figure 86: Reinstalling a SIB
Reinstalling the T640 Power Supplies
Each two-input 160-A DC power supply weighs approximately 23 lb (10.5 kg). Each
three-input 240-A DC power supply weighs approximately 25 lb (11.3 kg). Each four-input
240–A weighs approximately 26.6 lb (12.0 kg). Each six-input DC power supply weighs
39.7 lb (18.0 kg).
Reinstall the lower power supply first, then the upper power supply. To reinstall the power
supplies, see Figure 87 on page 201.
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to an approved site ESD grounding point. See the instructions for your site.
2. Switch the circuit breakers on the two-input 160-A, three-input 240-A, or four-input
240-A power supply faceplate to the off position (O), or the power switch on the AC
power supplies or six-input DC power supplies to the standby position.
3. Using both hands, slide the power supply into the chassis until you feel resistance.
4. Twist the ejector handles at the upper corners of the power supply faceplate clockwise
until they stop.
5. Tighten the captive screws at the lower corners of the power supply faceplate to
secure the power supply in the chassis.
6. Repeat the procedure for the upper power supply.
Copyright © 2017, Juniper Networks, Inc.200
T640 Core Router Hardware Guide
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