Hello:
I have a problem with the cradle of a GE CTi CT scanner. When turning on the machine I can't make cradle reference, the display just keeps flashing and the cradle advances about 6 inches and stops, pushing again the IN button advances about 6 inches and stops. If fast motion is activated cradle advances just a couple of inches. Checking the log I get this message:
Host: ETC Proc: Cradle Error 182213
File: Cmd Motion Function: Pat Anatomy Positionin
HW Error: Velocity Tracking Error
Expected Velocity 500 (0.001 mm/sec)
Actual Velocity 8097 (0.01 mm/sec)
Current Position 5523
Velocity Tolerance 250
I have already performed charachterization once and have the charachterization files restored. Potentiometer seems to be OK (at least votages are reasonable). Every once in a while cradle works OK, with slower speeds, but keeps working OK just for a few minutes before failing again. The failure doesn't allow to make zero for positioning the patient therfore no studies can be performed. I will appreciatte any help you can provide. Thanks.
Elias
It sounds like you may have a faulty longitudinal encoder. Other things to check and/or replace would be the cradle servo amplifier in the table base, verify that the stranded steel cables running to the cradle pot/encoder assembly are not kinked or broken, and the longitudinal limit switches.
Limit switches seem to be working OK, as well as the potentiometer, I got reasonable voltages on the board when moving manually the table. The steel cable seems to be OK. Yesterday the table started working OK and kept working for about 5 or 6 hours, after performing a shutdown it failed again and have not worked since then. Another symptom, when moving the cradle it runs at a higher speed than normal and frequently keeps moving even after the IN or OUT button is released. Problem started after replacing a Power Supply in the SGI's Indigo2 computer, a couple of patients were made and then the table started to fail. So far I have not considered the power supply had anything to do with the failure. I'll try to get an encoder and the amplifier. Would the ETC board be considered also? Thanks.
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Elias Valdes
CTi scanner table problem
August 27, 2010 10:53
Hello:
I have a problem with the cradle of a GE CTi CT scanner. When turning on the machine I can't make cradle reference, the display just keeps flashing and the cradle advances about 6 inches and stops, pushing again the IN button advances about 6 inches and stops. If fast motion is activated cradle advances just a couple of inches. Checking the log I get this message:
Host: ETC Proc: Cradle Error 182213
File: Cmd Motion Function: Pat Anatomy Positionin
HW Error: Velocity Tracking Error
Expected Velocity 500 (0.001 mm/sec)
Actual Velocity 8097 (0.01 mm/sec)
Current Position 5523
Velocity Tolerance 250
I have already performed charachterization once and have the charachterization files restored. Potentiometer seems to be OK (at least votages are reasonable). Every once in a while cradle works OK, with slower speeds, but keeps working OK just for a few minutes before failing again. The failure doesn't allow to make zero for positioning the patient therfore no studies can be performed. I will appreciatte any help you can provide. Thanks.
Elias
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Elliot Marcus
Re: CTi scanner table problem
August 28, 2010 08:46
Elias,
It sounds like you may have a faulty longitudinal encoder. Other things to check and/or replace would be the cradle servo amplifier in the table base, verify that the stranded steel cables running to the cradle pot/encoder assembly are not kinked or broken, and the longitudinal limit switches.
Good Luck,
Elliot
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Elias Valdes
Re: CTi scanner table problem
August 28, 2010 01:53
Limit switches seem to be working OK, as well as the potentiometer, I got reasonable voltages on the board when moving manually the table. The steel cable seems to be OK. Yesterday the table started working OK and kept working for about 5 or 6 hours, after performing a shutdown it failed again and have not worked since then. Another symptom, when moving the cradle it runs at a higher speed than normal and frequently keeps moving even after the IN or OUT button is released. Problem started after replacing a Power Supply in the SGI's Indigo2 computer, a couple of patients were made and then the table started to fail. So far I have not considered the power supply had anything to do with the failure. I'll try to get an encoder and the amplifier. Would the ETC board be considered also? Thanks.
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Elliot Marcus
Re: CTi scanner table problem
August 28, 2010 06:10
If you have access to an ETC board, I would certainly have it on hand since it reads the encoder pulses and sends velocity commands to the servo amp.
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