Connecting AC Power to a QFX3008-I Interconnect Device with Three-Phase Wye Wiring Trays

A QFX3008-I Interconnect device is configured with six AC power supplies and two wiring trays.

Caution: Mixing different types of wiring trays in the same chassis is not a supported configuration.

Caution: To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the QFX3008-I Interconnect device must be adequately grounded before it is connected to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the QFX3008-I Interconnect device to connect to earth ground. For instructions on connecting a QFX3008-I Interconnect device to ground using a separate grounding conductor, see Connecting Earth Ground to a QFX3008-I Interconnect Device. A QFX3008-I Interconnect device receives additional grounding when you plug the power supply in the device into a grounded AC power outlet by using the AC power cord appropriate for your geographical location. See AC Power Cord Specifications for a QFX3008-I Interconnect Device with Three-Phase Wye Wiring Trays.

Note: Each wiring tray must be connected to a dedicated AC power source outlet.

Before you begin to connect power to the device:

• Ensure that you understand how to prevent ESD damage. See Prevention of Electrostatic Discharge Damage.
• Ensure that a licensed electrician has prepared the power cords. See Preparing Delta and Wye Three-Phase Power Cords.

Ensure that you have the following parts and tools available to connect power to the device:

• Electrostatic discharge (ESD) grounding strap
• Phillips (+) screwdriver, number 1
• Slotted (–) screwdriver, 1/4 inch, with a torque range between 23 in-lb (2.6 Nm) and 25 in-lb (2.8 Nm)

  Caution: You must use an appropriate torque-controlled tool to tighten the screws on the terminal block. Applying excessive torque damages the terminal block and the wiring tray. The absolute maximum torque that may be applied to this screw is 50 in-lb (5.6 Nm).

Warning: Ensure that the power cords do not block access to device components or drape where people can trip on them.

To connect AC power to three-phase wye wiring trays:

1. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
2. Ensure that the power cords are not connected to power outlets. Switch off the customer site circuit breakers. Ensure that the voltage across the AC power source is 0 V and that there is no chance that the voltage might become active during installation.
3. If the wiring tray is installed in the chassis, remove it. See Removing a Wiring Tray from a QFX3008-I Interconnect Device. The power cord must be attached to the wiring tray as described in Preparing Delta and Wye Three-Phase Power Cords.
4. Ensure that the power switch on the wiring tray faceplate is in the OFF (O) position.
5. Using a number 1 Phillips (+) screwdriver, loosen the four screws on the metal AC wiring compartment on the side of the wiring tray (see Figure 1).
6. Open the metal door of the wiring tray compartment.

7. Connect the wires to the AC terminal block on the three-phase wye wiring tray (Figure 1). Use a 1/4-in. slotted screwdriver to loosen the input terminal or grounding point screw, insert each wire into the grounding point or input terminal, and tighten the screw to between 23 in-lb (2.6 Nm) and 25 in-lb (2.8 Nm).

   Caution: You must use an appropriate torque-controlled tool to tighten the screws on the terminal block. Applying excessive torque damages the terminal block and the wiring tray. The absolute maximum torque that may be applied to this screw is 50 in-lb (5.6 Nm).

   1. Insert the wire labeled GND into the grounding point labeled GND.
   2. Insert the wire labeled L1 into the L1 input terminal.
   3. Insert the wire labeled L2 into the L2 input terminal.
   4. Insert the wire labeled L3 into the L3 input terminal.
   5. Insert the wire labeled N into the N input terminal

   Figure 1: Connecting Power to the Three-Phase Wye Wiring Tray

   

   Note: The color of each AC power wire might vary.

8. Verify that the power cable connections are correct.
9. Replace the cover on the wiring compartment, and using a number 1 Phillips (+) screwdriver, tighten the four screws.
10. Repeat Step 3 through Step 9 for the other wiring tray.