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PID problem

Created by: Raffy at: 5/8/2013 9:28 AM (6 Replies)

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5/8/2013 9:28 AM	Rate (0)
Raffy Posts: 209 Rating: (2)	Hi guys, I am using a FB41 and FB43 to control a motor...it is a slow acting motor that changes the position of a lever...with this situation I've got a problem.....due to its slow actuation my PID controller overshoots (makes LMN = 100)....And this would make my system also overshoot and cannot reach its setpoint....I tried adjusting my TI and Td and also the proportional gain but it is really hard to make it stable.... What should be my techniques on getting the proper values of Ti and Td? Should I also adjust the FB43 parameters?? I'm using FB43 because I am controlling the motor which turns clockwise(raise) and counterclockwise(lower) and this would adjust theposition of the lever.... Could you please suggest tips and tricks on this matter? regards, Raffy
Raffy Posts: 209 Rating: (2)
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5/8/2013 9:37 AM	Rate (0)
Kampi Posts: 366 Rating: (30)	Hi, whats that exactly for a motor? its two-point-acting? one signal for opening and one for closing? And you get also a feedback for position (0-100%)? regards
Kampi Posts: 366 Rating: (30)
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5/8/2013 10:07 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating: (1368)	Raffy Hi guys, I am using a FB41 and FB43 to control a motor...it is a slow acting motor that changes the position of a lever...with this situation I've got a problem.....due to its slow actuation my PID controller overshoots (makes LMN = 100)....And this would make my system also overshoot and cannot reach its setpoint....I tried adjusting my TI and Td and also the proportional gain but it is really hard to make it stable.... What should be my techniques on getting the proper values of Ti and Td? Should I also adjust the FB43 parameters?? I'm using FB43 because I am controlling the motor which turns clockwise(raise) and counterclockwise(lower) and this would adjust theposition of the lever.... Could you please suggest tips and tricks on this matter? regards, Raffy Hello, First of all wrong conference for PID issues, please use "STEP7 Additional Software". About combination of FB41, FB43 I can only add FB43 is only map an analog input (fed from FB41) to a binary actuator.The point is contrary to sliders the actator in this case should retain a OFF status when there is no signal from FB43.For that I can mention a HEATER. Best regards Hamid Hosseini
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5/10/2013 5:07 AM	Rate (0)
Raffy Posts: 209 Rating: (2)	Hi kampi, it's actually a three point setting....raise - off - lower..... then a sensor would mesuare the position........ Now this motor is very slow acting....so the I'm having a hard time setting the gain, integral time and diff time....so maybe you could suggest a technique to me on how to calibrate or determine its values...
Raffy Posts: 209 Rating: (2)
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5/10/2013 5:10 AM	Rate (0)
Raffy Posts: 209 Rating: (2)	hdhosseini Hello, First of all wrong conference for PID issues, please use "STEP7 Additional Software". About combination of FB41, FB43 I can only add FB43 is only map an analog input (fed from FB41) to a binary actuator.The point is contrary to sliders the actator in this case should retain a OFF status when there is no signal from FB43.For that I can mention a HEATER. Best regards Hamid Hosseini Hi sir, I'm sorry I didn't know about where to post this thread...yes your right its like i'm controlling a binary actuator...now its really hard to me to configure the parameters... Could you please teach me on how to do this?? Thanks, raffy
Raffy Posts: 209 Rating: (2)
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5/10/2013 8:38 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating: (1368)	Raffy ...yes your right its like i'm controlling a binary actuator... now its really hard to me to configure the parameters... Could you please teach me on how to do this?? Hello again, Here we can provide references to follow.Similar question was asked before HERE: hdhosseini To find answer to all mentioned questions , please refer to 1-section 1-4-2 (Controller output signals) 2-section 3-1 (influence of final control element on control system) 3-section 9.1.5 (adjustment of the pulse generator stages) of this book: Controlling with SIMATIC and more training options HERE. Hope to be Helpful Hamid Hosseini
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5/16/2013 3:55 PM	Rate (0)
Kampi Posts: 366 Rating: (30)	Hi, Hamid Hosseini is helping you very good with the documentation. I also can tell you to use a ramp time (for increasing and decreasing setting value) that its not going too fast up and down. regards
Kampi Posts: 366 Rating: (30)
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