• Topic ID: id_16157803
  • Version: 2.0
  • Date: Apr 9, 2020 8:48:56 PM

Axial Dynamic Braking Module

Prerequisites

Overview

This procedure describes the proper method for safe access to the components of this assembly. Always use proper service practices in ESD, power control, and assembly/disassembly procedures. Verify all connections are correct and tightened prior power application.

Procedure

  1. Move table to its lowest elevation.
  2. Remove gantry covers as required.

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

  3. Tilt gantry forward to allow sufficient clearance for assembly cover removal.
    4. Notice Image
    • notice
    • Always turn OFF the HVDC before the 120 VAC. Turning OFF 120 VAC power before HVDC power can result in equipment damage.
  4. Turn off the three (3) main power switches (Axial Drive, HVDC, 120VAC) on the gantry’s Service Switch Panel (SSP). Remove all system power at the Main Disconnect panel.
    • danger
    • Electrocution hazard.
    • High Voltage present.
    • Turn off HVDC. Use proper lockout/tagout procedures before servicing components.
  5. Loosen four (4) slot binder screws located on the side metal cover.
  6. Carefully remove side metal cover.

    Once the side metal cover has been removed, the Dynamic Brake board and Chopper circuit components will be exposed.

    The chopper load resistors are located behind the Dynamic Brake board.

  7. Remove the screws and chopper load resistor cover as necessary.

    Figure 1. Axial Dynamic Brake Assembly

  8. Replace failed components.
    9. Notice Image
    • notice
    • Always turn ON the 120 VAC before the HVDC. Turning ON HVDC power before 120 VAC power can result in equipment damage.
  9. Replace covers and reassemble gantry.

Finalization

  1. Scan, to test brake operation.