Topic ID: id_11039025
Version: 3.0
Date: Jun 10, 2020 2:28:47 AM

No Load kV Test with Rotation

Prerequisites

Table 3. Consumables
Item	Quantity	Effectivity	Part number	Manufacturer
Transformer Oil (Mineral-Based Oil Only), 0.5 liter	1	-	2164148	-
Spanner Wrench	1	-	507A935G1	-
HV Tank Jig ASM	1	-	5437557	-

Table 5. Safety

warning

Potential for ShocK.
Voltage may be present.
Use proper lockout/tagout procedures before replacing components.

warning

POTENTIAL FOR PERSONAL INJURY OR EQUIPMENT DAMAGE.
GANTRY ROTATION CREATES POTENTIALLY HAZARDOUS PINCH POINTS.
WHEN ROTATING THE GANTRY, BE CAREFUL TO AVOID PINCH POINTS THAT MAY CAUSE PERSONAL INJURY OR DAMAGE TO CABLES AND HARDWARE.

warning

BURN HAZARD.
THE SURFACE ON X-ray Tube and High Voltage Tank CAN BECOME VERY HOT.
USE PROPER PROCEDURES AND PPE TO AVOID Injury.

Table 6. Required conditions
Condition	Reference	Effectivity
Generator input line in an acceptable range (670VDC +/-10%).	-	-
PPC kV control board alive and running : DS17 - DS24 Leds are lit successively or a combination of them blink.	-	-
inverter gate_cmd board DC supply present : DS300 neon is lit.	-	-
inverter quad snubber board DC supply present : DS1-DS2 leds are lit.	-	-
Shorted inverter test passed without failure.	-	-

This document provides the necessary steps to verify the health of the kV insulation of the High Voltage Tank and X-ray Tube. For kV insulation issues, instructions are provided to isolate to either a faulty High Voltage Tank or X-ray Tube.

note: First execute the test with the HV cables connected.

Procedure

Select DIAGNOSTICS from console Service desktop.
Select GENERATOR TOOL - JEDI
Select KV Diagnostics
Launch the NO LOAD KV DIAGNOSTIC tool.
Run the diagnostic. Verify:
- No error is reported on the console
- inverter gate_cmd board Leds DS101, DS102, DS201, DS202 are lit: IGBTs gate drive supply is working properly.
  
  If this test does not pass, then execute the test with the HV cables disconnected.
If needed, remove gantry side and front covers.
Perform High Voltage Termination Plug Installation
Verify that Class C, Class M software has been installed, and insert Class C and Class M Proprietary Service Key.
Perform ROTATING No Load KV testing

Run the No Load kV test using the following parameters: kV = 80, Exposure time (msec) = 1000, Gantry Rotation = Enabled, Rotation Speed (sec) = 2.000.
Figure 1. Rotating No Load KV Test
Click Confirm button. Then attention box will show up: Gantry Enabled to Rotate, Press OK button, it will start to rotate and scan.

Figure 2.
Run the diagnostic. Verify:
- No error is reported on the console
- inverter gate_cmd board Leds DS101, DS102, DS201, DS202 are lit : IGBTs gate drive supply is working properly
If the latter part of the test passes, along with the “Shorted Inverter Test ”, the system more than likely has a tube or HV cable problem.

Finalization

Turn OFF HVDC ENABLE, AXIAL DRIVE ENABLE, and 120 VAC ENABLE switches on Service Switch.
Remove High Voltage Terminal Plug and perform Securing HV Cable.
Turn ON 120 VAC ENABLE, AXIAL DRIVE ENABLE, and HVDC ENABLE switches on Service Switch.
Press ESTOP RESET on Service Switch panel and wait until scan hardware is reset.
Perform System Reboot.
note:
System Reboot is required to reset the JEDI software expected load capacitance value. If the System is not rebooted, a Wrong High Voltage Capacitance Measured type error may occur.