Good night everyone !
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I have a problem with the Y-axe DC motor on an hidraulic press. Sometimes it tend to slowly move clockwise when its suposed to stay still. I have measured 0.4 v on the motor conector while the others motor ( x1, x2 ) connectors have 0.1v .
When it works properly the input driver signal varies from 0 to +10v or -10v depending the direction and speed of the motor. ( 75 vdc, 3000 rpm, 110w )
It seems to me that the servo motor driver input has noise or a little offset coming from the axes board. This offset its enough to be amplified and slowly move the dc-motor. The encoder signals seems ok. They go to the driver and then to the hctl-1100 wich Is connected to the DAC wich output goes to the OpAmp.
Is there a safe way to injetc a DC offset to compensate the signal ? Just trying to detect where the problem begins. I dont have spare driver modules, axes board, motor, encoder, etc... to change.
The faillure is err¨¢tic. I'm also thinking in make it happen when its not failling.
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I'm thinking of using 2 x 3v batteries in series where the middle point Is grounded. Then a potentiometer between +3v and -3v AND the cursor to the signal. But my fear Is if the OpAmp could take the battery current without burning.?
Also, do I need to perfectly balance the potentiometer before conecting it to the OpAmp output to avoid the driver speed up the motor AND crash it to the l¨ªmit switch ?
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Perhaps I should use another OpAmp to add the signals
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Any ideas ?
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Thanks !
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