- Topic ID: concept_zmd_z2v_1jb
- Version: 2.0
- Date: Oct 28, 2019 4:24:38 AM
Tracking, Trending (TnT) Data
The Tracking and Trending log file is useful to gather data in order to predict the failures of tube and Xray generator, and define critical sites.
1 Generator Data
This is the list of the Jedi HP X-Ray Generator tracked data. It includes all the critical component temperatures measured or calculated with the generator thermal model (basing on the measurement of the inverter heatsink surface), the DC bus measurement and the cumulated exposure time.
2 Tracking & Trending Generator Data
2.1 Max Temperatures for Heatsink
Unit: Celsius degrees.
Analog measure on the heatsink surface.
Measurement logged in the TnT log file at the end of the preparation if max value detected. This max value should be reset to zero after each download of the TnT log file with a system command (at the end of the day or when the machine is stopped).
2.2 Max Temperatures for Parallel inductor
Unit: Celsius degrees.
Analog measure on the parallel inductor.
Measurement logged in the TnT log file at the end of the preparation if max value detected. This max value should be reset to zero after each download of the TnT log file with a system command (at the end of the day or when the machine is stopped).
2.3 Max Temperatures for HV Tank
Unit: Celsius degrees.
Analog measure on the MPHV Tank oil.
Measurement logged in the TnT log file at the end of the preparation if max value detected. This max value should be reset to zero after each download of the TnT log file with a system command (at the end of the day or when the machine is stopped).
2.4 DC_bus min in preparation
Unit: Volts.
Analog measure coming from the inverter: sampling time corresponds to each time we check the DC_ bus level in the software application loop (we compare it to expected level and save it if it is smaller than the last minimum value stored).
Measurement logged in the TnT log file at the end of preparation if min value detected. This min value should be reset to the fixed high DC-bus value (800 Volts) after each download of the TnT log file with a system command (at the end of the day or when the machine is stopped).
Minimum Value: 400V
2.5 DC_bus max in preparation
Unit: Volts.
Analog measure coming from the inverter: sampling time corresponds to each time we check the DC_ bus level in software application loop (we compare it to expected level and save it if it is greater than the last maximum value stored). Measurement logged in the TnT log file at the end of preparation if max value detected. This max value should be updated at zero after each download of the TnT log file with a system command (at the end of the day or when the machine is stopped).
Maximum Value: 800V
2.6 DC_bus min during exposure
Unit: Volts.
Analog measure coming from the inverter: sampling time corresponds to each time we check the DC_ bus level in SW application loop (we compare it to expected level and save it if it is smaller than the last minimum value stored).
Measurement logged in the TnT log file at the end of preparation if min value detected. This min value should be updated at a fixed high DC-bus value (800 Volts) after each download of the TnT log file with a system command (at the end of the day or when the machine is stopped).
Minimum Value: 400V
2.7 DC_bus max during exposure
Unit: Volts.
Analog measure coming from the inverter: sampling time corresponding to each time we check the DC_ bus level in SW application loop (we compare it to expected level and save it if it is smaller than the last maximum value stored).
Measurement logged in the TnT log file at the end of preparation if max value detected. This max value should be reset to zero after each download of the TnT log file with a system command (at the end of the day or when the machine is stopped).
Maximum Value: 800V
2.8 Time since first power-up
Unit: Hours.
Software counter (using saved NVRAM timer).
Counter logged in the TnT log file at end of preparation. This value should not be reset during the life of the machine.
2.9 NVRAM battery life time
Unit: Hours.
Software counter (using saved NVRAM timer).
Counter logged in the TnT log file at end of preparation. This value should be reset by system command when NVRAM Battery or kVcontrol board is replaced.
Normal operating range: 0 - 70,128 hrs (8 years)
2.10 Cumulated Power-on time
Unit: Hours.
Software counter (using saved NVRAM timer).
Counter logged in the TnT log file at end of preparation. This value should not be reset during the life of the machine.
3 Generator Service Diagnostic Data
3.1 Inverter average current
Unit: Amps
The measured inverter average current during the last exposure.
3.2 Actual kV
Unit: kV
The measured average kV present during the last exposure.
3.3 Actual mA
Unit: mA
The measured average mA present during the last exposure.
3.4 Actual exposure time
Unit: Seconds
The measured actual exposure time of the last exposure.
4 Example: TnT log file Data type Xray Generator
5 Tube Data
This is the list of the X-Ray tube's tracked data. It includes all the tube parameters which can be measured by the Generator. All these parameters should be reset to zero each time we change the tube.
6 Tracking and Trending Generator Data
6.1 Filament aging corrections for small filament
Unit: Filament Amps
Difference between Heater current consign value at end of exposure (last autocalibration value) and theorical Heater current value defined with JEDI HP software database emission curve parameters.
This parameter is logged in the TnT log file at end of preparation.
6.2 Filament aging corrections for large filament
Unit: Filament Amps
Difference between Heater current consign value at end of exposure (last autocalibration value) and theorical Heater current value defined with JEDI HP software database emission curve parameters.
This parameter is logged in the TnT log file at end of preparation.
6.3 Total number of spits
Unit: None
This contains the number of tube spits detected by the generator.
This counter is logged in the TnT log file at end of preparation.
6.4 Cathode spits
Unit: None
The number of cathode spits detected by the generator.
This counter is logged in the TnT log file at end of preparation.
6.5 Anode spits
Unit: None
The number of anode spits detected by the generator.
This counter is logged in the TnT log file at end of preparation.
6.6 Anode - Cathode spits
Unit: None
The number of spits between anode and cathode detected by the generator.
This counter is logged in the TnT log file at end of preparation.
6.7 kV regulation spits
Unit: None
Spit software counter (Large Filament + Small Filament): kV regulation spits. These are not actual tube spits detected inside the X-Ray tube, rather a kV regulation spit is defined as a kV regulation error.
Normal Operating Range: 0 kV regulation errors, in theory, should not occur. If they do occur, they will usually occur in bunches. This is a typical indicator of an X-Ray tube or Tank problem.
This counter is logged in the TnT log file at end of preparation.
6.8 Number of exposures on small filament
Unit: None
Small filament exposures software counter.
This counter is logged in the TnT log file at end of preparation.
6.9 Number of exposures on large filament
Unit: None
Large filament exposures software counter.
This counter is logged in the TnT log file at end of preparation.
6.10 Total exposures number
Unit: None
Small filament + Large filament exposures software counter.
This counter is logged in the TnT log file at end of preparation.
6.11 Number of anode accelerations
Unit: None
Preparation command counter.
This counter is logged in the TnT log file at end of preparation.
6.12 Cumulated energy on small filament
Unit: Joules
Measured (multiply kV measured by mAs measured): small focus.
This measurement is logged in the TnT log file at end of preparation.
6.13 Cumulated energy on large filament
Unit: Joules
Measured (multiply kV measured by mAs measured): large focus.
This measurement is logged in the TnT log file at end of preparation.
6.14 Cumulated Rad exposure time on small focus
Unit: Seconds
Cumulated time measured while the measured actual kV is over 75% of the requested kV: small focus.
This measurement is logged in the TnT log file at end of preparation.
6.15 Cumulated Rad exposure time on large focus
Unit: Seconds
Cumulated time measured while the measured actual kV is over 75% of the requested kV: large focus.
This measurement is logged in the TnT log file at end of preparation.
6.16 Cumulated mAs
Unit: mAs
mAs measured for each exposure and added to the last value.
This measurement is logged in the TnT log file at end of preparation.
7 Tube Service Diagnostic Data
Rotation PWM duty cycle:
Unit: V (Volts)
This voltage correlates to the voltage necessary to drive the X-Ray tube rotor. It is expected that if a tube bearing is nearing end-of-life that this voltage increases, although a normal operating range for this value has not yet been established. This measurement is logged in the TnT log file at end of rotor acceleration.
Normal Operating Range: Not yet established (9-03)