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Rate Indicator

Created by: semi-automatic at: 5/14/2009 8:49 AM (3 Replies)

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5/14/2009 8:49 AM	Rate (0)
semi-automatic Posts: 2 Rating: (0)	Has anyone done a simple rate indicator similar to a Red Lion CUB5? Seems like it would be a very handy block to have and i'm surprised its not there. This is to display a process rate but I would also like to use the rate for comparison to control the speed of a downstream equipment via digital or analog signals to the VFD. I've read some interesting examples using encoders and mag pick-ups(pulses) but I am doing low frequency (ie 60units/min) and would be using a photoeye for rate counts. Rate would be displayed in units/min and update with a minimum 5 sec frequency. Also, what is available for doing simple math or comparison logic such as "if rate is>30 then Q1=1"? Or maybe some one has a better way to go about this all together.... Thanks, Zed
semi-automatic Posts: 2 Rating: (0)
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5/16/2009 10:51 PM	Rate (0)
Betel Platinum Expert Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating: (580)	Hi semi-automatic, please look at the following links for some infos from me about the measuring of pulses per time: "motor control" "Display of scaled High Speed Input Values" Now my ideas for a solution of your question: a) The block (digital) threshold trigger is not a good way. b) Mycircuit Demo_Threshold_trigger.zipis possible to use. Thecyclic measuring (= displaying) of a value and the scaling into x/minutes is possible, but with lower measuring time the resolution of the result is going down too! For6 s measuring time to 0..6 if the displayed valueis in x/minute. c) My next circuit in german forum partDemo_gleitender_Mittelwertzähler.zip (from Durchschnitt über 8 Stunden) can solve thisabout b). I have modified this circuit for you with your given parameters and put it into the attachment... The program give an actual value at 8 times into the summary measuring time. Now it is possible to use a bigger value for the measuring (integration) time (here = 60 s) and an actualisation of the display all 7,5 s (with a displayed valuein x/minute) !!! Best regards Betel Attachment Demo_rate_indicator_8x7_5sec.zip (549 Downloads)
	==> Meine TAG-Listen: "deut." ==> "Sammlung von Hinweisen und Schaltungen" ==> "PD-3-Punkt-Schritt-Regelung (z.B. für Mischer)" ==> "Zeiterfassung, ASTRO-Uhr,..." ==> "Meine EXCEL-Tools" + "Tool zur Linearisierung" ==> "Komplexes Rechnen mit der LOGO"
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5/21/2009 6:47 AM	Rate (0)
semi-automatic Posts: 2 Rating: (0)	WOW thats cool. Took me a couple days just to decipher some of that. Unfortunately the rate does not update until the first minute has passed and with zero pulses at the input it takes the same amout of time to wind down. This will not work for my application. Also the amount of blocks may put the cycle time higher than I would like as I have a high speed portion of this program for one output. I did however, learn a great deal from your inovative use of blocks and it has given me some ideas about this application and others as well. Thank you for taking the time to share your thoughts. -Zed Link to CUB5 rate indicator: http://www.redlion.net/Products/Groups/Counter/Rate/CUB5/Docs/01012.pdf
semi-automatic Posts: 2 Rating: (0)
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5/21/2009 8:28 PM	Rate (0)
Betel Platinum Expert Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating: (580)	Hi, i am sorry, but i think, the CUB5 works nearly in the same way as my circuit. The way to use a smaler time window and to have a resolution big enough (and have in this way a better speed of measuring results) is only to use a sensor with a higher number of pulses per round! Best regards Betel
	==> Meine TAG-Listen: "deut." ==> "Sammlung von Hinweisen und Schaltungen" ==> "PD-3-Punkt-Schritt-Regelung (z.B. für Mischer)" ==> "Zeiterfassung, ASTRO-Uhr,..." ==> "Meine EXCEL-Tools" + "Tool zur Linearisierung" ==> "Komplexes Rechnen mit der LOGO"
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