9. Disconnect the wires from the AC terminal block on the three-phase delta AC power
supply (Figure 216 on page 406). Loosen each of the input terminals or grounding point
screws, 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 L3 from the L3 input terminal.
b. Remove the wire labeled L2 from the L2 input terminal.
c. Remove the wire labeled L1 from the L1 input terminal.
d. Remove the wire labeled GND from the grounding point labeled GND.
Figure 216: Disconnecting the Power Cord from a Three-Phase Delta AC
Power Supply
10. Loosen the plastic cable tie fastening the AC power cord to the power supply.
11. Loosen and remove the retaining nut from the AC power cord.
Copyright © 2017, Juniper Networks, Inc.406
T640 Core Router Hardware Guide
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