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 Aug 18 2008, 05:05 PM
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2 more posts to go! Member Posts: 8 Joined: 9-July 08 Member No.: 11955 Using LabVIEW Since:2008 LV:8.5.1 ,. ,. 
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Hi,
I am trying to control the speed of a 3-axes system which controls the motion of a tool in the three directions. How can I control the velocity of this tool? I have an existing labview program to do this. But need to be able to change the velocity with which the tool moves. Is it possible to do this? Thank you for your attention.
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Aug 18 2008, 05:05 PM
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Aug 18 2008, 05:13 PM
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 Extremely Active Premium Member  Posts: 451 Joined: 19-June 07 From: Everett, WA Member No.: 8758 Using LabVIEW Since:2007 LV:8.6 ,8.5.1 ,8.2.1 
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QUOTE (electrika @ Aug 18 2008, 10:05 AM)  Hi, I am trying to control the speed of a 3-axes system which controls the motion of a tool in the three directions. How can I control the velocity of this tool? I have an existing labview program to do this. But need to be able to change the velocity with which the tool moves. Is it possible to do this? Thank you for your attention. We are going to need a lot more information. It is difficult to answer your question without knowing what you are controlling, what are you controlling it with (hardware used), what have you already tried, etc. Post your code so we can see what you are working with.
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Aug 18 2008, 05:25 PM
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#3
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 I'm a LAVA, not a fighter. V I Engineering, Inc.  Posts: 3749 Joined: 13-October 03 From: Michigan, USA Member No.: 181 Using LabVIEW Since:1993 LV:8.5 ,. ,. 
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QUOTE (electrika @ Aug 18 2008, 01:05 PM) Is it possible to do this? QUOTE (TobyD @ Aug 18 2008, 01:13 PM) We are going to need a lot more information. I agree with TobyD, but you might want to have a look at the NI motion pages to start with. -------------------- 
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Aug 19 2008, 08:17 AM
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#4
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 Very Active Premium Member Posts: 179 Joined: 19-January 05 From: Switzerland Member No.: 1396 Using LabVIEW Since:1998 LV:8.20 ,8.0.1 ,7.1.1 
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QUOTE (electrika @ Aug 18 2008, 07:05 PM) Hi, I am trying to control the speed of a 3-axes system which controls the motion of a tool in the three directions. How can I control the velocity of this tool? I have an existing labview program to do this. But need to be able to change the velocity with which the tool moves. Is it possible to do this? Thank you for your attention. I control multiple axis, but as already told we need to know more about your hardware / software used to help you... do you use a NI-Motion Controller? in which mode does he opperate absolute/relative contouring, position mode, or whateve? if you change the speed you could get problems with your system (it can become instable..) --------------------  Happy Wiring! (User defined "Swiss Wire Class" for neutral data only!!!)
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Aug 20 2008, 03:23 PM
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#5
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2 more posts to go! Member Posts: 8 Joined: 9-July 08 Member No.: 11955 Using LabVIEW Since:2008 LV:8.5.1 ,. ,.
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I use a Newport PM500C Precision Motion Controller....actually the Z motion of the system has a feed back system, there is a digital balance kept below and I am trying to maintain a constant(specified) weight. But the speed with which the motor moves down is different for different specified weights. But now I want to maintain a constant speed of the Z axis throughout irrespective of the weight specifed.
I am thinking that an open loop will work for me in this case but I am not sure if it will affect the system stability. Sorry for a delayed reply. I hope you guys can still help me with this. Thanks. QUOTE (martin@aerodynamics @ Aug 19 2008, 08:17 AM) I control multiple axis, but as already told we need to know more about your hardware / software used to help you...
do you use a NI-Motion Controller? in which mode does he opperate absolute/relative contouring, position mode, or whateve? if you change the speed you could get problems with your system (it can become instable..)
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Aug 20 2008, 05:04 PM
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#6
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2 more posts to go! Member Posts: 8 Joined: 9-July 08 Member No.: 11955 Using LabVIEW Since:2008 LV:8.5.1 ,. ,.
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This is the code for the feedback loop! Hope that will help.
Attached File(s)
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Aug 21 2008, 07:08 AM
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#7
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Very Active Premium Member Posts: 179 Joined: 19-January 05 From: Switzerland Member No.: 1396 Using LabVIEW Since:1998 LV:8.20 ,8.0.1 ,7.1.1
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QUOTE (electrika @ Aug 20 2008, 07:04 PM) This is the code for the feedback loop! Hope that will help. can you post your vi? or at least a picture of the blockdiagramm from your "G" vi... -------------------- Happy Wiring! (User defined "Swiss Wire Class" for neutral data only!!!)
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Aug 21 2008, 04:34 PM
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#8
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2 more posts to go! Member Posts: 8 Joined: 9-July 08 Member No.: 11955 Using LabVIEW Since:2008 LV:8.5.1 ,. ,.
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QUOTE (martin@aerodynamics @ Aug 21 2008, 07:08 AM) can you post your vi? or at least a picture of the blockdiagramm from your "G" vi... Sorry ....here it is.
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