6. Remove the ESD grounding strap from the approved site ESD grounding point. See
the instructions for your site. Reconnect the strap to one of the ESD points on the
chassis.
7. Using a number 2 Phillips (+) screwdriver, unscrew the two screws on the metal cover
protecting the AC terminal block.
8. Disconnect the wires from the AC terminal block and grounding point on the
three-phase wye AC power supply (Figure 224 on page 417), loosen each screw, and
remove each wire from the grounding point or input terminal.
NOTE: The terminal connectionshaveeither slotted screws or hex screws.
Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in
(4-mm) Allen wrench for the 5/16-in hex screws.
a. Remove the wire labeled N from the N input terminal
b. Remove the wire labeled L3 from the L3 input terminal.
c. Remove the wire labeled L2 from the L2 input terminal.
d. Remove the wire labeled L1 from the L1 input terminal.
e. Remove the wire labeled GND from the grounding point labeled GND.
Figure 224: Disconnecting the AC Power Cord from a Three-Phase Wye
AC Power Supply
9. Loosen the plastic cable tie fastening the AC power cord to the power supply.
10. Loosen and remove the retaining nut from the AC power cord.
11. Pull the AC power cord out of the metal wiring compartment.
12. Carefully move the AC power cable out of the way.
417Copyright © 2017, Juniper Networks, Inc.
Chapter 29: Replacing Power System Components
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