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DR4 Switch on weight limit value

Created by: createstars at: 9/30/2009 9:39 AM (4 Replies)

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9/30/2009 9:39 AM	Rate (0)
createstars Posts: 71 Rating: (0)	Hi, Im working on a a demo project "Getting started for Belt Scale" One of the parameters for the system is "DR 4 Switch on weight limit" It mentions that when the switch on value is larger than the switch off value, a maximum value monitor is realized and vice versa. I couldnt really understand this one. Could someone please explain to me what is this maximum value monitor and minimum value monitor? Thank you. createstars
createstars Posts: 71 Rating: (0)
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9/30/2009 10:27 AM	Rate (0)
The Brain Gold Member Joined: 10/19/2005 Last visit: 11/30/2020 Posts: 1611 Rating: (121)	Hi, did you mean this FAQ? -> http://support.automation.siemens.com/WW/view/en/21063615 I did not find there info about "DR 4"... I think it is better if you look under "Process Instrumentation / Analytics / Weighing Systems SIWAREX" for more info. regards,
	Last edited by: The Brain at: 9/30/2009 10:28 AM
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10/9/2009 4:22 PM	Rate (0)
Siwarexi Gold Expert Joined: 1/4/2007 Last visit: 11/13/2024 Posts: 1147 Rating: (175)	Hello createstars, Attached you can find a screenshot of the DR4 into the file “DR4_Limit_Values.JPG”: I will use this screenshot to explain to you the parameters into the DR4. 1. Example: You can see that the “Switch-on limit value 1” = “1.0” and the “Shut-off weight limit value 1” = “1.1”. That means: The switch off value is larger than the switch on value, so you have a minimum value monitor. For example: You have a bin with a liquid inside. The liquid level is decreasing into the bin, and the weight value falls below the “1.0”. Now, the bit “Limit 1” get the state “true”. Attached you can see the bit “Limit 1” into the file “DR30_Limit_Bits.JPG”. If the liquid level is now increasing into the bin, and the weight value exceeds the “1.1” the bit “Limit 1” get the state “false”. 2. Example: You can see that the “Switch-on limit value 2” = “50.0” and the “Shut-off weight limit value 2” = “49.0”. That means: The switch off value is less than the switch on value, so you have a maximum value monitor. For example: You have a bin with a liquid inside. The liquid level is increasing into the bin, and the weight value exceeds the “50.0”. Now, the bit “Limit 2” get the state “true”. Attached you can see the bit “Limit 2” into the file “DR30_Limit_Bits.JPG”. If the liquid level is now decreasing into the bin, and the weight value falls below the “49.0” the bit “Limit 2” get the state “false”. (But normally, it is not necessary to use these limit vlaues for a belt-scale application.) Best regards Siwarexi Attachment pictures.zip (251 Downloads)

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10/12/2009 6:12 AM	Rate (0)
createstars Posts: 71 Rating: (0)	Thank you for your explanations. I appreciate it. However, I got another message when i run the belt scale project. It stated that " weight outside zero definition range". What does this mean? Thank you again. Cresta
createstars Posts: 71 Rating: (0)
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10/26/2009 3:19 PM	Rate (0)
Siwarexi Gold Expert Joined: 1/4/2007 Last visit: 11/13/2024 Posts: 1147 Rating: (175)	Hello createstars, The error message "weight outside zero definition range" means: The belt scale is out of the zeroing definition range. You can define the zeroing definition range into the DR3 / Calibration param. 3: “Zeroing val - (%)” and “Zeroing + (%)” The numeric value means the maximum positiv and negative weight for zeroing in % of the parameter “Maximum range 1” into the DR3 / Calibration param. 2. (See also the first page of the attached file.) For example: “Maximum range 1” = 200.0“ Zeroing val - (%)” = 1“ Zeroing + (%)” = 3 The zeroing definition range is here: -2.0 ... +6.0 kg (or tons or ...) of the gross weight. Also you have to undershoot the limit into the DR5 / Load: “Max. zeroing range load value (0,1%)” (See also the second page of the attached file.) If the two criteria above (maximum positiv / negative weight for zeroing AND Max. zeroing range load value) are conform, the status-bit “Dynamic zero range” is true. (See also the third page of the attached file.) If this status-bit is true, you can execute the command “zeroing”. Best regards Siwarexi Attachment FTC_B.pdf (260 Downloads)

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