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MNormile

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  2. Shaft Encoder (X2) counting issues

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Thanks for your reply.

    It is a MEZ 3 phase motor, which has a running speed of 705 rpm. I have put a vsd on it, which I have set to 40 hz, but as a test I could half it to 20 hz and see if I am getting more consistency.

    Also just to note, if I tell the machine to go to 200mm like my original example, which should be 41334 pulses. when it stops, the pulse count is in fact 41334, correct me if I am wrong but I was thinking if it was due to the motor not stopping bang on in this position, then the encoder count should not be equal to the desired count? I would imagine the encoder count to be out due to the drift on the machine.

     

  4. Shaft Encoder (X2) counting issues

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Hi All,

    I was wondering could I get some advice.

    I have a V130-33-TR20 plc and am looking to program a simple enough application. 

    1 motor which moves a backstop on a guillotine, 0-750 mm variable distance.

    I have a new 1024 ppr encoder on the machine.  I have wired a and a- to input 0 and 1.

    From 0 -750 mm the plc counts roughly 155000 pulses. there is no brake on the motor so when it reaches the out limit switch there is a variation on when it stops. plus or minus 300 pulses

    I thought it would be simple math. Therefore 155000 / 750 mm = 206.6 pulses per mm.

    Therefore if I want the backstop to go to 200mm. the code would simply wait for (200*206 =  41334 pulses) and then that is the target. The issue I am having is the counts from the encoder must be drifting as when you give it the command to go to a distance it could be off by 10mm, or 5mm, however does not seem to be any consistency  which i would have thought an encoder would bring.

    I have attached my code just wondering am I doing something wrong. Also to note I am new to unitronics.

    Below is the link to my encoder

    https://uk.rs-online.com/web/p/rotary-encoders/9189098/

     

    Any help or advice would be appreciated

     

    Encoder_Test.vlp

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