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Part 4: Connect Power to the Switch

 

Depending on the model, you can use either AC or DC power supplies. The power supplies install in the slots on the rear panel.

Caution

Do not mix AC and DC power supplies in the same switch.

Note

Grounding is required for models that use DC power supplies and recommended for models that use AC power supplies. An AC-powered switch gets additional grounding when you connect the power supply in the switch to a grounded AC power source outlet by using the power cord.

Before you connect power to the switch, wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.

To connect earth ground to a switch:

  1. Before you connect power to the switch, wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.

To connect power to a switch powered by AC power supply (see Figure 7):

Figure 7: Connecting Power to a EX4650 Switch Powered by AC Power Supply
Connecting
Power to a EX4650 Switch Powered by AC Power Supply
  1. Push the end of the retainer strip into the hole next to the inlet on the power supply faceplate until it snaps into place.
  2. Press the tab on the retainer strip to loosen the loop. Slide the loop until you have enough space to insert the power cord coupler into the inlet.
  3. Insert the power cord coupler firmly into the inlet.
  4. Slide the loop toward the power supply until it is snug against the base of the coupler.
  5. Press the tab on the loop and draw out the loop into a tight circle.
  6. Insert the power cord plug into the power source outlet.
  7. Verify that the IN OK and the OUT OK LEDs on the power supply are lit green and on steadily.

To connect power to a switch powered by DC power supply (see Figure 8):

Figure 8: Connecting Power to a EX4650 Switch Powered by DC Power Supply
Connecting
Power to a EX4650 Switch Powered by DC Power Supply

The DC power supply has terminals labeled V-, V–, V+, and V+ for connecting DC power source cables labeled positive (+) and negative (–).

Warning

Ensure that the input circuit breaker is open so that the cable leads will not become active while you are connecting DC power.

Caution

Ensure that you install the power supply first and then connect DC power source cables, before closing input breaker ON.

  1. Remove the terminal block cover. The terminal block cover is a piece of clear plastic that snaps into place over the terminal block.
  2. Remove the screws on the terminals by using the screwdriver. Save the screws.
  3. Connect each power supply to a power source. Secure power source cables to the power supplies by screwing the ring lugs attached to the cables to the appropriate terminals by using the screws from the terminals.
    • Secure the ring lug of the positive (+) DC power source cable to the V+ terminal on the DC power supply.

    • Secure the ring lug of the negative (–) DC power source cable to the V– terminal on the DC power supply.

    • Tighten the screws on the power supply terminals by using an appropriate screwdriver. Do not overtighten—apply between 5 lb-in. (0.56 Nm) and 6 lb-in. (0.68 Nm) of torque to the screws.

  4. Replace the terminal block cover.
  5. Close the input circuit breaker.
  6. Verify that the IN OK and the OUT OK LEDs on the power supply are lit green and on steadily.