7/16/2016 11:04 AM | |
Posts: 200 Rating: (6) |
Hi Have tried some of these examples in the help section under Boiler control. |
7/16/2016 11:43 AM | |
Posts: 5225 Rating: (1192) |
£56.5 / hour |
7/17/2016 4:43 AM | |
Posts: 124 Rating: (13) |
Hello Liever, Take o look. Operation in automatic. Only one bottom to start and stop. One flag by heater. In case of fault all the heaters will to state "1", step by step according the timer. After start, all time with four heaters. Case to analyse: when group (M1, M2, M3 and M4) are working, the time is larger then another group, for example (M2, M3, M4 and M5). I think that is a little dificult to solve using two Shift Register because we have a arithimetic ratio 6:8 or 3:4. Regards. AttachmentAutomatic heating 16 07 2016.zip (334 Downloads) |
Last edited by: Dinos at: 7/17/2016 5:05:46 AM |
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This contribution was helpful to1 thankful Users |
7/17/2016 11:12 PM | |
Posts: 124 Rating: (13) |
Hello Liever, I took in count four basic things: no simultaneity start, four heater in "1" condition, identical switching time and automatic operation. As the operator need to start and stop each heater, you must consider as follow: each marker permits the operator to control each heater. There are two options: 1. The operator can start and stop each heater exclusively during the marker interval. 2. The operator can start the heater during the marker interval and stop at the finish of process. I think that second option is more appropriate: when begining a process it must to go until its final. See options. Regards, AttachmentAutomatic heating complement 17 07 2016.zip (322 Downloads) |
7/18/2016 6:03 PM | |
Posts: 13 Rating: (0) |
Hello Dinos In regard of your last post 1. Any heater can be started as the first, because, for example M5 is ready to begin the process. The operator don't need wait for his time. Agreed :The sequence of the start up of the cooking procedure isn't that important. The operator has only a start and stop button for each heater . Also an emergency button is included for all 6 heaters. When the operator pushes start for heater 1 , I1 is high .When he pushes stop I2 is low. When he pushes the emergency button ,all the PID regulators are off .Q1 makes or brakes the output of PID1 . This has been already executed (See attache image) 2. A second heater begins the process after a time from the first one, for example, M3. I think this interval is necessary for eletrical reason. If not, it can be done without interval. Agreed : this is a nice feature 3. And the third and fourth heater follows this procedure. They can be, for example M6 and M1. Agreed 4. When four heaters is working, the next heater will wait until one of the four in process stops. Here we have eletric reason (current). Agreed : When four heaters are working and there is demand of 5 (I1 - incl -I5 are high) , they should alternate between them 5 . When I6 is high , they should alternate between them 6. The kettles should alternate when more than 4 inputs are active. They should alternate accordingly the inputs . I think we might need a new program Regards AttachmentIMG.pdf (315 Downloads) |
7/19/2016 12:36 AM | |
Posts: 124 Rating: (13) |
Hello Liever, See suggestion. Features: 1. The heaters operation are manual and individual by start and stop buttons. 2. Any heater can be started and stoped at any time without sequence. 3. Until four heaters can be work at the same time. After the fourth, if the operator tries start another one, this action don't takes effect, because the threshold trigger don't permit. 4. If the emergency button is pressed all the markers goes to "0". Each marker disable a PID contoller. 5. Each start of each haeter send number 1 to a counter. Mathematicals instructions add numbers of counters and send to threshold trigger. Threshold send "0" to AND functions after number 4. 6. Each counter return to number zero when the stop button is pressed. 7. With the markers you can do whenever you want: resistance contactor coil, timers, etc. 8. With a TDE module, for example, the operator can view operation time or remaing time for each heater process. Alternativelly, you can use the basic module display for this. AttachmentHeating controller V1 18 07 2016.zip (210 Downloads) |
7/20/2016 7:31 AM | |
Posts: 13 Rating: (0) |
Hello Dinos Take a look at the enclosed doc. This has already been executed (except wiring I1 and Q1). The other 5 heaters are wired in the same way. To respond at your last post 1.The plant can work with no more than 4 heaters. If more than 4 works, the plant can be in fire, by overcurrent. Indeed , no more than 4 heaters can be on at the same time 2. Each heater processing takes 15 minutes, which 10 minutes in "1" and 5 minutes in "0". If somebody reduces this time, the final product can be compromised. That´s a quick way to shut the businees doors. Misunderstood : a cycle time of the sequence takes 15 minutes, which 10 minutes in "1" and 5 minutes in "0" ,when I1 to I6 are on Output Inputs I1 to I6 are 1 111100 I1 is 1 for 2.5 min 011110 I1 is 0 for 2.5 min 001111 I1 is 0 for 2.5 min 100111 I1 is 1 for 2.5 min 110011 I1 is 1 for 2.5 min 111001 I1 is 1 for 2.5 min 111100 Starting a new cycle Result : Every 2.5 min a new output is started ,the one with the longest working time is stopped Output Q1 is on for 10 min , off for 5 min A cycle time of the sequence takes 12.5 minutes, which 10 minutes in "1" and 5 minutes in "0" ,when I1 to I5 are on , I6 is off Output Inputs I1 to I5 are 1 , I6 is 0 111100 I1 is 1 for 2.5 min 011110 I1 is 0 for 2.5 min 101110 I1 is 1 for 2.5 min 110110 I1 is 1 for 2.5 min 111010 I1 is 1 for 2.5 min 111100 starting a new cycle Result : I6 is "0" , so Q6 is "0" Output Q1 is on for 10 min , off for 2.5 min 3. In the project that I made and you didn´t improve at now, there is nothing about process timers because you define that the process is doing manually. Manually means pressing buttons and checking a wrist watch. Misunderstood : See attached image , the operator can manually start and stop (enable/disable) the cooking proces for each heater. Every 2.5 min there is a switching of the outputs of the logo. This is a loop system ( I should have mentioned it earlier). When the operator enables I1 to I6 , Q1 to Q4 outputs are on for 2.5 min. After these 2,5 min , Q2 to Q5 are on for 2,5 min. And so on and so on. Ex. To stop the cooking process for heater 1, the operator has to press the "stop" button. (I1 is"0") So now Q1 is taken out of the loop sequence. A. Can the plant works with 6 heaters at the same time? If the answer is "YES", you really don't need a Logo. No It can't because of the current No more than 4 heaters may be on at the same time. Kind regards AttachmentIMG.pdf (197 Downloads) |
7/21/2016 4:41 AM | |
Posts: 124 Rating: (13) |
Hello Liever, Take o look in Cicle timing diagrams. It is clear to me now. I did them based in your grid os states with and without heater 6. We have to return to first project because the equipaments work based in times. Regards, AttachmentHeaters timing diagram 20 07 2016.zip (229 Downloads) |
7/21/2016 6:47 PM | |
Posts: 13 Rating: (0) |
Hello Dinos Thanks for the effort. I'm going to hire a programmer , because the program is due to next week. I'll post the program online. Kind regards |
8/3/2016 8:34 PM | |
Posts: 13 Rating: (0) |
Here is the program It was too costly to make an alternative cyclus with 5 heaters , so when 5 heaters are on , it is still the same loop cycle like when 6 heaters are on. Regards AttachmentD2112_P1930A_Stoomketels_20160727.zip (229 Downloads) |
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