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you may proceed with report writing for other practical pressure P and amend necessary changes as stated before. Check previous Padlet comment for your group.

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group Wong pressure P practical 4 at PB120%

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group Wong pressure P practical 4 at PB120%

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I just realized your PV stay at 50%. I think your team forgot to change it to auto mode after manual adjustment

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SP50 V4 Half Opened. You should extend the graph to include stable trends which you have in raw data. Other than that, everything should be ready for report writing.

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for SP50 at PB400%, you should get PV inline with SP. you may proceed with report after that.

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Actually i ask for raw data for practical 2 (P) the file you upload is the same things, just want to make sure the trend but since it has an acceptable trend. You may proceed with report.

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Hi sir, the comment on pressure raw data is for p or pi?

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please use correct data for step 6 practical 4 pg. 9

you may proceed with report for pressure

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please provide the raw data -unaltered-

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proceed with report f

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proceed with report

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We will include the raw data next time. Thanks sir :)

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proceed with report

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proceed with report for flow P and PI. Next time, attached together raw data.

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The stable data was taken but it was used to plot for the next step(refer to Step 6). We will improve the graph for both PB 120% and 150% for the report.

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Thank you for the comments, sir. We will omit the PV 6000 outliers. :)

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exclude PV outliers (6000+)

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group Afifah practical 4 pressure P controller (step 3)

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group Afifah practical 4 pressure P controller (step 3)

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check your graph

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for SP 30 to 10, your result for SP change has not stabilized to SP10 yet.

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group jolene practical 4 step 1&2 pressure

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group jolene practical 4 step 1&2 pressure

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you raw data for this step/experiment has PV of 6000

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group fardaus (pressure P controller practical 4 PB 150%)

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group fardaus (pressure P controller practical 4 PB 150%)

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data should show stable PV. Check also PB 12% at set point 70%.

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practical 4, refer to the graph below. need more data to show stable PV

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Hi Sir, is there any lab format/ guideline that we should follow?

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sir, how about our raw data. it's okay?

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please include axis for every graph and legend should refer to the same trend for both graph

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ya sure you can do that....i look forward to see your graph

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Hi sir, for effect of changing P-band, we were just following what the instructions tell us to do. But we'll try to plot all P-bands in a graph with matching(constant) setpoint so that the trends can be seen clearly. :)
We'll update you with our practical 3 graphs and raw data in excel file. Thank you sir. :)

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Thank you sir for your feedback. We will update the raw data as soon as possible. :-)

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Thank you sir, noted. We will do the correction as per mentioned

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upload your raw data as well and make sure table has proper column title.
practical 3 effect of changing the set point,  first graph 50%sp has too big y-axis which is why 50% is almost at 0%. for graph step 1-2,  have you try change the SP directly to 70%. It might produce diff result. Try or see other group findings that change SP directly.

for effect of changing the P band
objective is to study effect of changing P band to process variable (PV). I believe what you doing is for effect of changing the set point. If your team still want to continue with that data, you may need to include all the plot in one graph and make sure point is the same for x-axis. Alternatively, you can constant the SP, auto mode then change the P band accordingly to observe the offset.

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relationship proportional band and output

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relationship proportional band and output

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Commonly referred to as the throttling range (TR), proportional band is defined as the amount of change in the controlled variable required to drive the loop output from 0 to 100%.  Systems subjected to abrupt changes in load or setpoint will typically require a wider proportional band to achieve stability in control during these system upsets.  Very quick system response times, such as those found in static pressure control, will require much wider proportional bands to prevent “overshoot,” the most common cause of oscillation.  The gain of the loop is inversely proportional to the throttling range or proportional band.  In general, decreasing the throttling range will increase the amount of over shoot.  Conversely, the larger the throttling range, the slower the loop will respond.

Gain is the ratio of output change (%) over the measured variable change (%) that caused it.

Where PB is the proportional band.

Example:  If the PB is 20%, then the gain is 5.  A 3% change in the error signal (setpoint- process variable) will result in a 15% change in a controller’s output, due to the proportional action.  If gain is 2, then the PB is 50%.

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can you provide plot for that data as well as use proper column title.

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practical 2 P-control offset
you should same amount of value/plot/data point for all the graph here. It important because you want to compare them.

as for PI control, based on other group result. At Tr=0, you should experience large offset and when you increase the Tr, PV will gradually meet/match/overlap SP

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for practical 2  Proportional Controller of Flow Control , your result show no effect of changing the P band. You cannot discuss it using this data. I suggest you increase the gap between point.

for PI controller of flow control, you should start with Tr=0 and increase the Tr gradually to observe the effect. By doing this, you could observe the effect of Tr to that system.

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raw data here should include excel file with your experimental result. Table of raw data should have proper column description/title

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raw data here should include excel file with your experimental result. Table of raw data should have proper column description/title

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hi... you could actually discuss efficiently here. everybody can read your comment and share their insight

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hi... you could actually discuss efficiently here. everybody can read your comment and share their insight

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https://padlet.com/khairulanwar862/rkne2uuz44wc