Specifisaurus Posted February 27, 2013 Report Share Posted February 27, 2013 Is anyone else having issues with the analog output tolerances on the vision controllers? We are currently using a v350 controller and running a 4-20mA output to a VFD which requires a fairly precise control level. Using the same program on three different controls we have found that the 4-20mA signal varies upwards of 1/2 mA - 1mA making precise control nearly impossible without testing a ton of units. We are well below the 500ohm limits, and we can see these variances with just a meter with or without load. The wiring when installled is 18AWG, shielded and runs approximately 2 feet. Any thoughts? Quote Link to comment Share on other sites More sharing options...
Emil Posted February 27, 2013 Report Share Posted February 27, 2013 Did you try the units on your desk or only in the field? Can you try them in free of noise environment? Quote Link to comment Share on other sites More sharing options...
Specifisaurus Posted February 27, 2013 Author Report Share Posted February 27, 2013 All the testing was done in our office at our desk away from any sources of noise. The incoming power was clean and stable. Quote Link to comment Share on other sites More sharing options...
Emil Posted February 27, 2013 Report Share Posted February 27, 2013 Please send to support@unitronics.com: table of results of the test for different output levels - nuber set in PLC and relevant current measured; S/N of the units; OS installed; Maybe some picture of the test circuit. Having this information, I'll investigate and will give you answers ASAP. Thank you for your cooperation. Quote Link to comment Share on other sites More sharing options...
Specifisaurus Posted February 27, 2013 Author Report Share Posted February 27, 2013 Thank you Emil, I will get this information together after lunch and send it out right away. Quote Link to comment Share on other sites More sharing options...
Specifisaurus Posted February 28, 2013 Author Report Share Posted February 28, 2013 The information has been emailed, I apologize for the delay. Quote Link to comment Share on other sites More sharing options...
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