• Topic ID: id_17422976
  • Version: 3.0
  • Date: Apr 22, 2019 12:56:34 AM

ORP Replacement

Prerequisites

Overview

This document provides the necessary steps to replace and configure the Onboard Rotation Processor Unit (ORP) for imaging.

1 ORP Assembly Removal

Procedure

  1. Move table to home position.
  2. Remove gantry right side cover.
  3. Stop the rotor of X-ray tube in case of Liquid Bearing Tube before HVDC off. Refer to Liquid Bearing Tube Rotor stop procedure for details.
  4. Turn off [HVDC ENABLE], [AXIAL DRIVE ENABLE] and [120 VAC ENABLE] switches on Service Switch panel.
  5. Remove power to system. See Equipment Service - Lockout-Tagout-PPE from Safety section.
  6. Remove scan window, gantry left side cover, gantry top covers and gantry front cover.
  7. Rotate gantry such that ORP assembly is in 2 o'clock position.
  8. Engage rotational lock. See Equipment Service - Lockout-Tagout-PPE from Safety section.
  9. Disconnect four front cables and one rear cable from ORP Assembly.
  10. Detach and remove cable clamp from top of ORP Assembly with a 3mm Allen Wrench.
  11. Move cable bundle away from ORP Assembly in order to avoid damage during ORP Assembly removal / install process.
  12. Remove three M6 mounting screws from front of gantry with a 5mm hex bit socket drive and 12 inch extension (See Figure 1).

    Figure 1. ORP Assembly Mounting Screws

  13. Remove ORP Assembly from gantry.

2 ORP Assembly Installation

Procedure

  1. Position ORP Assembly on to gantry and fasten with three M6 mounting screws.
  2. Tighten each M6 mounting screw with a 5mm hex bit socket torque wrench and 12 inch extension, to the following torque values.
  3. Connect four front cables and one rear cable to ORP Assembly.
  4. Attach cable clamp to ORP Assembly top cover bracket and install harness into cable clamp.
  5. Secure cable clamp to ORP Assembly top cover bracket with a 3mm Allen Wrench.
  6. Disengage rotational lock. See Equipment Service - Lockout-Tagout-PPE from Safety section.
  7. Restore power to system. See Equipment Service - Lockout-Tagout-PPE from Safety section.
  8. From Console Unix Shell prompt, type touch /usr/g/fw/orpFtp and press ENTER.
  9. Turn on 120 VAC ENABLE, AXIAL DRIVE ENABLE, and HVDC ENABLE switches on Service Switch Panel.
  10. Press ESTOP RESET on Service Switch panel and wait until scan hardware is reset.

3 Setup, Checks, Alignments, and Calibrations

Procedure

  1. FLASH Download
  2. Gantry Rotation Safety Check
  3. Gantry Balance Procedure
  4. Turn off [HVDC ENABLE], [AXIAL DRIVE ENABLE] and [120 VAC ENABLE] switches on Service Switch panel.
  5. Install gantry front cover, gantry top covers, gantry left side cover and scan window.
  6. Turn on 120 VAC ENABLE, AXIAL DRIVE ENABLE, and HVDC ENABLE switches on Service Switch Panel.
  7. Press ESTOP RESET on Service Switch panel and wait until scan hardware is reset.
  8. Install gantry right side cover.