Replacing a (3NO) Contactor in the Side Compartment 3-Phase Power Distribution Unit

Complete the following steps before beginning this repair procedure:
  1. Power off the ATE Core Configurations Generation 2 by flipping the main disconnect branch breaker to off.
  2. If your ATE Core Configurations Generation 2 utilizes a UPS to provide backup power, press the power button on the UPS to power it down.
  3. Disconnect the ATE Core Configurations Generation 2 from facility power.
Refer to the following table to see which shipping kits this procedure applies to.
Shipping Kit Part Number Description
789094-01 440 V 3-Pole (3NO) Contactor, 24 V to 60 V DC Controlled

This procedure only applies to ATE-38U, ATE-44U, and ATE-38E racks.

Equipment

  • 3 mm hex key
  • T20 Torx head screwdriver, 1.30 N · m (11.5 in. · lb)
  • #2 Phillips head screwdriver, 1.70 N · m (15.0 in. · lb)
  • 4 mm hex key, 5.00 N · m (44.3 in. · lb)
  1. Remove the left side panel of the ATE Core Configurations Generation 2 using the 3 mm hex key.
  2. Unscrew the four screws to remove the hinge bracket cover using the T20 Torx head screwdriver.
  3. Locate the (3NO) contactor.


    1. 3-Pole (3NO) contactor
  4. Disconnect the panel-to-contactor cables from the contactor using the #2 Phillips head screwdriver.
  5. If necessary, disconnect the daisy chain contactor cables from the contactor using the #2 Phillips head screwdriver.
  6. Disconnect the circuit-breaker-to-contactor cables from the (3NO) contactor using the 4 mm hex key.


    1. 3-Pole (3NO) contactor
    2. Panel-to-contactor cables
    3. Daisy chain contactor cables
    4. Circuit-breaker-to-contactor cables
  7. Remove the contactor from the DIN rail.
  8. Install the new (3NO) contactor on the DIN rail.
  9. Connect the panel-to-contactor cables to the new contactor using the #2 Phillips head screwdriver.
  10. If necessary, connect the daisy chain contactor cables to the new contactor using the #2 Phillips head screwdriver.
  11. Connect the circuit-breaker-to-contactor cables to the new contactor using the 4 mm hex key.
  12. Screw in the hinge bracket cover using the T20 Torx head screwdriver.
  13. Reinstall the left side panel of the ATE Core Configurations Generation 2 using the 3 mm hex key.
Once installation of the new (3NO) contactor is complete, you can reconnect facility power to the ATE Core Configurations Generation 2 and power on the rack.