User manual JUNIPER NETWORKS MX960 UPGRADING

[. . . ] Upgrading MX240, MX480, and MX960 3D Universal Edge Router Fan Trays and Power Supplies December 2010 Part Number: 530-036423 Revision 02 This document describes the necessary steps to be taken to upgrade any Juniper Networks MX Series 3D Universal Edge Router chassis to higher capacity cooling and higher capacity power. Step-by-step descriptions are given for replacement of the various parts in the chassis. All of these upgrades can be performed while the system is operational, but it is important to follow the complete process through. NOTE: Combinations of regular-capacity and high-capacity supplies and fan trays are not supported outside of the upgrade window. CAUTION: The router cannot be powered from AC and DC power supplies simultaneously. The first type of power supply detected by the router when initially powered on determines the type of power supply allowed by the router. [. . . ] Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis. 3. Move the DC circuit breaker on the power supply faceplate to the off (O) position. Using both hands, slide the power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate should be flush with any adjacent power supply faceplate or blank installed in the power supply slot. 5. Tighten the captive screws on the lower edge of the power supply faceplate. Remove the clear plastic cover protecting the terminal studs on the faceplate. Remove the nut and washer from each of the terminal studs. Secure each power cable lug to the terminal studs, first with the flat washer, then with the split washer, and then with the nut (see Figure 17 on page 22). [11 mm] torque-controlled driver or socket wrench. ) a. Secure the positive (+) DC source power cable lug to the RTN (return) terminal. Secure the negative (­) DC source power cable lug to the ­48V (input) terminal. CAUTION: Ensure that each power cable lug seats flush against the surface of the terminal block as you are tightening the nuts. Ensure that each nut is properly threaded onto the terminal stud. The nut should be able to spin freely with your fingers when it is first placed onto the terminal stud. Applying installation torque to the nut when improperly threaded may result in damage to the terminal stud. Copyright © 2010, Juniper Networks, Inc. 19 Upgrading MX240, MX480, and MX960 3D Universal Edge Router Power Supplies and Fan Trays CAUTION: The maximum torque rating of the terminal studs on the DC power supply is 36 lb-in. The terminal studs may be damaged if excessive torque is applied. Use only a torque-controlled driver or socket wrench to tighten nuts on the DC power supply terminal studs. 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. NOTE: The DC power supplies in PEM0 and PEM1 must be powered by dedicated power feeds derived from feed A, and the DC power supplies in PEM2 and PEM3 must be powered by dedicated power feeds derived from feed B. This configuration provides the commonly deployed A/B feed redundancy for the system. NOTE: For information about connecting to DC power sources, see DC Power Supply Electrical Specifications for the MX480 Router. 9. Replace the clear plastic cover over the terminal studs on the faceplate. Route the power cables along the cable restraint toward the left or right corner of the chassis. [. . . ] This configuration provides the commonly deployed A/B feed redundancy for the system. For information about connecting to DC power sources, see DC Power Supply Electrical Specifications for the MX960 Router. 11. Loosen the captive screw on the cable restraint on the lower edge of the power supply faceplate. 12. Route the positive and negative DC power cables through the left and right sides of the cable restraint. 13. [. . . ]