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No output from PID

Created by: whateverman at: 1/31/2013 1:57 PM (9 Replies)

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1/31/2013 1:57 PM	Rate (0)
whateverman Posts: 9 Rating: (0)	Hello, I am a student and working on a regulation with two containers of water, one which are to heat up the water and at a chosen temperature, a pump is supposed to start and pump the water up to the other container. My problem is that when i put in a PID for the level regulation I do not get any output from the PID, I set my setpoint to 50%, and my input is at about 40%, I use the Input_PER, therefore i go directly from my ultrasonic meter, and my output is also _PER so i go directly to my pump, but my pump does not get any signal, I have tried changing my setpoint, but that does not change my output. Thanks in advance for any help!
whateverman Posts: 9 Rating: (0)
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1/31/2013 2:24 PM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, Can you provide us some screenshots or pdf of the block-call? Without more information we can only quess. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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1/31/2013 7:43 PM	Rate (0)
whateverman Posts: 9 Rating: (0)	I won't be able to do so before mondayas the computer with the program lies at the school, i will update with pics as fast as I can.
whateverman Posts: 9 Rating: (0)
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1/31/2013 7:50 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/5/2026 Posts: 6892 Rating: (1368)	whateverman Hello, I am a student and working on a regulation with two containers of water, one which are to heat up the water and at a chosen temperature, a pump is supposed to start and pump the water up to the other container. My problem is that when i put in a PID for the level regulation I do not get any output from the PID, I set my setpoint to 50%, and my input is at about 40%, I use the Input_PER, therefore i go directly from my ultrasonic meter, and my output is also _PER so i go directly to my pump, but my pump does not get any signal, I have tried changing my setpoint, but that does not change my output. Thanks in advance for any help! Hello , Please, check if your controller is not forced to manual on 0%. Best regards Hamid Hosseini
	Demo Channel on Youtube
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2/4/2013 9:37 AM	Rate (0)
whateverman Posts: 9 Rating: (0)	Marcjan Hello, Can you provide us some screenshots or pdf of the block-call? Without more information we can only quess. Regards, Marcjan Attachment No output pics.zip (519 Downloads)
whateverman Posts: 9 Rating: (0)
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2/4/2013 10:12 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, I think this could be the cause : Note Execute the PID instruction at constant intervals of the sampling time (preferably in a cyclic OB). Because the PID loop needs a certain time to respond to changes of the control value, do not calculate the output value in every cycle. Do not execute the PID instruction in the main program cycle OB (such as OB 1). Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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2/5/2013 9:14 AM	Rate (0)
whateverman Posts: 9 Rating: (0)	Hello , Please, check if your controller is not forced to manual on 0%. Best regards Hamid Hosseini Could you provide a path for this? I'm not really sure where to find this Also, today I was not able to download to device, because my PID was out of date, where can I update this?
whateverman Posts: 9 Rating: (0)	Last edited by: whateverman at: 2/5/2013 9:14 AM
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2/5/2013 9:17 AM	Rate (0)
whateverman Posts: 9 Rating: (0)	Hello, I think this could be the cause : Note Execute the PID instruction at constant intervals of the sampling time (preferably in a cyclic OB). My PID is in a cyclic OB (Main_1[OB123] Because the PID loop needs a certain time to respond to changes of the control value, do not calculate the output value in every cycle. Do not execute the PID instruction in the main program cycle OB (such as OB 1). This should be ok if I execute it in another OB which is called Main_1[OB123]? Regards, Marcjan
whateverman Posts: 9 Rating: (0)
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2/14/2013 11:45 AM	Rate (0)
whateverman Posts: 9 Rating: (0)	hdhosseini whateverman Hello, I am a student and working on a regulation with two containers of water, one which are to heat up the water and at a chosen temperature, a pump is supposed to start and pump the water up to the other container. My problem is that when i put in a PID for the level regulation I do not get any output from the PID, I set my setpoint to 50%, and my input is at about 40%, I use the Input_PER, therefore i go directly from my ultrasonic meter, and my output is also _PER so i go directly to my pump, but my pump does not get any signal, I have tried changing my setpoint, but that does not change my output. Thanks in advance for any help! Hello , Please, check if your controller is not forced to manual on 0%. Best regards Hamid Hosseini Could you provide a path for this? I can't seem to find the force to 0%. Ex. Technology Object> PID compact> Configuration> Basic Setting > (default) General \| to change measurment type
whateverman Posts: 9 Rating: (0)	Last edited by: whateverman at: 2/14/2013 12:18 PM
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2/15/2013 8:57 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/5/2026 Posts: 6892 Rating: (1368)	whateverman Hello , Please, check if your controller is not forced to manual on 0%. Best regards Hamid Hosseini Could you provide a path for this? I'm not really sure where to find this Also, today I was not able to download to device, because my PID was out of date, where can I update this? Hello, For checking if a PID Compact controller is in manual mode , You have option of enabling ""REG1".ManualEnable" and select a value to ""REG1".ManualValue".REG1 is the name of data block storing data of controller.See the attachment. Best regards Hamid Hosseini Attachment manual.jpg (638 Downloads)
	Demo Channel on Youtube
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