ABlearner

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About ABlearner

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  • Country United Kingdom
  1. Hi! A have a question about how can I send the current User data from the Panelview (HMI) to the PLC. Its an allen bradley PLC 1756 L71. In the Factory Talk view I tried to make a register and to move in it the current user, but unfortunatelly its not working. Is anybody here who can help me with this ? Thanks ahead. Br.
  2. Positioning and speed control

    Hello Guys. Is it possible to use an fr-a840 to use in the same time positioning control and also in speed control mode ? In the moment the vfd is in speed control mode. But now i also have to need to stop the conveyor in certain position. It will be a new feature. If its not possible, do i need a hsc ?  The speed of the conveyor is 20 m/min and the accuracy should be within 3 mm.  Could anybody help me with this.  Thanks ahead.
  3. Positioning and speed control

    Hello Guys. Is it possible to use an fr-a840 to use in the same time positioning control and also in speed control mode ? In the moment the vfd is in speed control mode. But now i also have to need to stop the conveyor in certain position. It will be a new feature. If its not possible, do i need a hsc ?  The speed of the conveyor is 20 m/min and the accuracy should be within 3 mm.  Could anybody help me with this.  Thanks ahead.
  4. Conveyor tracking

    Thank you for the thorough answer. Lets assume the drive cant do it.  In this case do i need an encoder on the conveyor ? The conveyor maximum speed is 20 m/min. In this case do i need a high speed counter module too in the plc ?  The precision should be within 3 mm. Thanks. 
  5. Conveyor tracking

    Hello thank you for the answer.  Yes i have an encoder on the the conveyor motor. Is it enough ? Or do i have to apply also an i dependent one on the conveyor directly ?   Thanks. 
  6. Hello Guys, I have a Mitsubishi A8000 series vfd with an encoder card and also encoder. With analog (0-10V) signal i can read back the current speed. The conveyor convey paper sheets. Occasionally they change the width of the paper but the the two type of paper is connected. We have a camera on the begging of the conveyor, and we would like to lets say cut it 2 meter later. But the position should be very precise otherwise we are not cut it in the good position. The cutting procedure would happen also an asynchronous motor or with servo motor.  Is it possible to write a tracking program and cut paper sheet in a good position ? My plane is to stop the CV in the position and waiting for the cut and go on.  The plc is Allen Bradley, control logix 5580. Any tip would be appreciated. Thank you so much. 
  7. Hello Guys! I have a problem what I can't really solve. In factory talk view (10.0) I wanna use a momentary push button. When I start the project, and I click on it nothing happening, the button activate only when I release it. Its like there is an OSF instruction inside.  I want the button activate until I push. May I use a wrong button ? Could you guy please help me with this? Thanks ahead.
  8. Encoder position with vfd

    Thanks for the feedback.  The encoder is sew ES7C/AA. TTL/HTL encoder. So actually none of them. Its a push pull output encoder. The option card type is FR A8AP.    So if i can get position then how ? I already use the inverter to read the speed of the motor. Thanks ahead. 
  9. Encoder position with vfd

    Hello guys.  I have a question, i have a mistubishi fr-a800 vfd with an encoder option card. On the motor we have an encoder.  I can read back the speed with the plc with analog signal. But can i use also for, tracking the distance ? Can i set anyhow the inverter lets say after one round on the encder send some digital signal to the plc. Is there any chance to set it ?  Lets say this is a conveyor, in this case its better if i put an encoder/counter on the conveyor and it will be directly connected to the plc.  Thanks ahead
  10. Mitsubishi safety relay

    Hello, Thanks for the feedback. I think you wanted to writie VFD not VSD. No I don't need one more inverter. I would like to get one more safety output for my system. But in my understanding I have to attach an expansion unit to get one more. I read about more, beside connection of  the EA, EB, EG, EP terminals, I have to connect the first modul's OUT terminal with the second's IN terminal. I still don't know, what should be, the inputs of the expansion modul ? Should I let the without connected ? Or should I use short cicuit between X0-COM0, and X1 - COM1, or I have to use the same inputs as used for the main module. Please guys help. Thanks ahead.
  11. Mitsubishi safety relay

    Hello guys! A would like to set up a new inverter for my existing machine. I wanna follow the recomandation about the safety wiring. The only problem is I need one more, Z safety output. I checked, there is official expansion unit, and it says I have to only connect the EA, EB, EG, and EP terminals ? Do I have to connect again the X0, COM0 ; X1, COM1 terminals, because I want actually the same inputs, just I need one more safety relay output. I attached picture about it, thanks ahead. 
  12. Inverter nameplate

    Hi,  Do anyone knows what is the meaning of the following inverter nameplats characters ? FR-A840-00023-E2-60 Mainly the beginning with the FR-A. Thanks ahead.  
  13. Hi Guys,  It might be an off topic, but I need some help, with motor sizing. I have to choose a Sew motor with a proper gearhead. I made the calculation, for the speed thats okay. But I got stuck with the loads. It will be a conveyor, the roller and the product mass altogether is 29 kg. I  made the calculation for the load inertia check: Roller moment of inertia (J1);    m2=mass of roller;     d=diameter(mm) J1=1/8*m2*d^2*2=1/8*8*0,2^2*2= 800 * 10^-4 kgm^2 Belt and material mass = m1 = 21 kg;  Belt and work moment of inertia (J2): J2=m1*( π * d)^2/4* π ^2= 2100 * 10^-4 kgm^2 J=J1+J2 = 2900 * 10^-4 kgm^2 They give me a motor with gearhead, sew eurodrive Ka37/T DRS71S4BE05. This motor performance is 0,37kW, I think its enough, but on the documentetion, I didn't find any data, about the permitted load inertia. Can anybody help me with this ? Thanks ahead.            
  14. Produced & Consumed tags

    Thank you so much your answer. In this case do I have to download the plc program again ? Or I only have to create the tags in both PLC and done ?  Thanks ahead.
  15. Hi guys,  I have been thinking about wether can increase the numbers of produced and consumed tags, between my plc-s. Currently I have two plc it already have produced and consumed tags, but unfortunatelly soon we are running out of free tags. I read the manual and it said I can make 125 dint tags, currently we have only an array with 10 element.  If I make a new one and I kinda copy it, with different names, will it be work ?  Or do I have to set something else ?  Can I ruin the communication with the two plcs ?  THanks ahead.