adccommunitymod (AutomationDirect) asked a question.
Created Date: October 12,2005
Created By: Scott_George
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I am currently making some changes to a system with a master - follower setup. Using a 350CPU I am taking the analog out of the master drive (0-20ma) and sending it into V2000 and then multiplying it by a ratio from a EZ touch and sending it to the follower drive at V3001. This is working fine. However, I also need to display the actual speed and ratio from the follower drive and use feedback control on it because the follower drive is the key to the system. The drive (a KB) is not capable of giving an accurate feedback, so I have installed a Red Lion tach feedback unit that is accurate and I am feeding this back into the PLC V2001. Now to my question. What would be the best way to make sure the follower drive maintains the speed reference it is given on V3001. Should I use PID control to compare the V2001 (actual) to V3001 (reference) and control it? Or, should I use some other method? I would like to keep this as simple as possible. I am close without feedback, but I want to be as close as I can be. Any recommendations would be appreciated.
Created Date: October 13,2005
Created by: stimpsonjcat
Well sure, that sounds like an app for PID.
Created Date: October 24,2005
Created by: Gerry
You lost me when you said:
"the follower drive is the key to the system "
The master is usually the key to the system. The follower should just follow. Your circuit to verify that it follows sounds reasonable. But, now you say you want to control it. That wouldn't be a master-follower then.
Can you give some details as to what you are driving with this system and what you need to control?
Created Date: October 13,2005
Created by: stimpsonjcat
Well sure, that sounds like an app for PID.
Created Date: October 24,2005
Created by: Gerry
You lost me when you said:
"the follower drive is the key to the system "
The master is usually the key to the system. The follower should just follow. Your circuit to verify that it follows sounds reasonable. But, now you say you want to control it. That wouldn't be a master-follower then.
Can you give some details as to what you are driving with this system and what you need to control?
Created Date: October 12,2005
Created by: Scott_George
I am currently making some changes to a system with a master - follower setup. Using a 350CPU I am taking the analog out of the master drive (0-20ma) and sending it into V2000 and then multiplying it by a ratio from a EZ touch and sending it to the follower drive at V3001. This is working fine.
However, I also need to display the actual speed and ratio from the follower drive and use feedback control on it because the follower drive is the key to the system. The drive (a KB) is not capable of giving an accurate feedback, so I have installed a Red Lion tach feedback unit that is accurate and I am feeding this back into the PLC V2001.
Now to my question. What would be the best way to make sure the follower drive maintains the speed reference it is given on V3001. Should I use PID control to compare the V2001 (actual) to V3001 (reference) and control it? Or, should I use some other method? I would like to keep this as simple as possible. I am close without feedback, but I want to be as close as I can be.
Any recommendations would be appreciated.