• Topic ID: id_16158121
  • Version: 2.0
  • Date: Jun 10, 2020 2:45:52 AM

TGPU Power Supply Replacement - for small room

Prerequisites

Overview

Procedure

    • caution
    • Potential for shock.
    • Voltage may be present.
    • No service on the left side while energized. Follow appropriate LOTO procedures.
  1. Remove gantry covers as required Side and top covers will need to be removed.
  2. Turn OFF all 3 switches (Axial Drive, HVDC, 120VAC) on the service control panel.
    3. Notice Image
    • notice
    • Always turn OFF the HVDC before the 120VAC. Turning OFF 120VAC power before HVDC power can result in equipment damage.
  3. Power down the console and Lockout/Tagout.
  4. Remove the gantry front cover and rear cover.
  5. Remove the 4 screws that mount the TGPU Power Supply to the mounting pan.
  6. Disconnect the cables that connect to the power supply.
  7. Remove the TGPU Power Supply. See Figure 1

    Figure 1. Remove TGPU Power Supply

  8. Install the new Power Supply in the reverse order. Connect cables by referring to the instruction pasted on the side of the Power Supply.
    note: There are two types of TGPU Power Supply with different cable connection (Slot 1 and Slot 2 exchanged). Make sure cables are correctly connected according to the instruction pasted on the side of the Power Supply.

    Figure 2. Old-type TGPU Power Supply

    Figure 3. New-type TGPU Power Supply

Finalization

  1. Remove the A1 LOTO.
  2. Turn ON the gantry service switches and power up the console.
  3. With a DVM, check the voltage on the supply.
  4. Install all removed gantry covers.
    note: Reconnect all top cover fan connections. Ensure that no cables are left in the rotating path. Return dollies to storage areas.
  5. Retest the system.