• Topic ID: id_17479593
  • Version: 1.0
  • Date: Aug 28, 2018 3:55:50 PM

Gantry Cooling Fan Replacement

Prerequisites

Overview

The top cover fans are controlled by the stationary CFC board. You can swap the fan connections to verify that the fan is defective.

1 Cover Removal

Procedure

    Notice Image
    • warning
    • Potential for Shock.
    • Voltage may be present. Potential for injury if covers removed and power is left ON.
    • Always remove the right side cover first, and turn OFF power at the service switches.
  1. Remove gantry right side cover.
  2. Turn OFF the three (3) main power switches (Axial Drive, HVDC and 120VAC) on the Service Switch Panel.
  3. Remove the applicable top cover and slide the rear cover backward.

2 Top Fan Assembly Replacement

Procedure

  1. Loosen the lock screw of the top fan assembly, and rotate the top fan assembly.

    Figure 1. Lock Screw of the Top Fan Assembly

  2. Cut tie-wraps holding the top fan cable and disconnect the top fan cable connector.

    Figure 2. Top Fan Cable

  3. Remove six M6 screws that holding the fan to the top fan frame, and remove the fan assembly from the top fan mounting base.

    Figure 3. Top Fan Removal

  4. Attach the new fan assembly to the fan mounting base, and tighten the six M6 screws.
  5. Connect the cable connector to the fan assembly.
  6. Rotate the top fan assembly to the original position, and tighten the lock screw.

3 Finalization

Procedure

  1. Reinstall top and side covers per cover procedures including gantry power up steps.

    Refer to Parts Replacement > Gantry > Enclosure > (Cover Removal Procedure).

  2. Verify all fans start immediately after a power reset to the gantry. The fans will then either turn off or change to a system defined speed dependent on the current gantry temperature.