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PID compac and V20

Created by: krisson211 at: 9/18/2017 8:53 AM (3 Replies)

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9/18/2017 8:53 AM	Rate (0)
krisson211 Posts: 19 Rating: (0)	Hi everyone, I want to controll flowrate of a belt weight feeder with PLC s7 1200 1212C by controll speed of conveyor through inverter V20 . But i'm in trouble now 1. When I use PID compac i convert the Flowrate(kg/s) setpoint to Speed(m/s),and the input is speed value too So what will i recieve in output : speed value(m/s), or percentage value(%). 2. I intended to use AO in PLC to send setpoint to AI in V20. Should I convert the output in PID compac to percentage of frequency before send to V20.
krisson211 Posts: 19 Rating: (0)
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9/18/2017 3:53 PM	Rate (0)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 12/2/2024 Posts: 5953 Rating: (819)	Hello, the parameter work with 100% = 4000 Hex. e.g Analogoutput: 100% = 4000 Hex = 10V See Parameter P2000 - P2004 (description in the manual). 5.6.2.4 Setting the PID controller https://support.industry.siemens.com/cs/ww/en/view/109748571
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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9/19/2017 4:44 AM	Rate (0)
krisson211 Posts: 19 Rating: (0)	Thanks you TechTeam, I mean the PID_Compact in Tia Portal, not in simanics V20. I still don't know exactly the output value if I set in controller type Velocity (m/s) so the setpoint and input must be Velocity (m/s) but what about the output. Is it Velocity (m/s) or percentage (%) ?
krisson211 Posts: 19 Rating: (0)
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9/19/2017 4:15 PM	Rate (0)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 12/2/2024 Posts: 5953 Rating: (819)	Hello, for a closed control loop you need actual value and set value. Then you get a setpoint, depending on the gain and control difference. Please do a test with fix values (actual value and set value) on the PLC with the function block. The setpoint must be converted in a percent value (4000 hex = 100% see P2000). You can check the speed setpoint on drive side, to check your logic.
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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This contribution was helpful to 1 thankful Users krisson211

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