Eliran Posted May 28, 2021 Report Share Posted May 28, 2021 Is there any example/tutorial that learn how to control an AC motor with VFD and encoder, using PLC? Quote Link to comment Share on other sites More sharing options...
MVP 2022 kratmel Posted May 30, 2021 MVP 2022 Report Share Posted May 30, 2021 Hi, i try to post some tips about standard VFD, Encoder and PLC: 1) It is not possible to build closed loop control (servo control) on standard VFD+encoder + standard PLC; 2) Standard PLC with HSC connected to encoder can offer positioning machine driven via VFD. 3) For positioning two speed - FAST and SLOW setpoint must be proggrammed on VFD (or provided by PLC). Then user must program ladder net with FAST to SLOW changeover based on distance to setpoint. 4) If positioning used for CUT to LENGTH application - simple encoder register reset is used for -0- setting. 5) If you need to set position of standard linear axis - home position evaluation is the main problem. 6) It is hard to build (or not possible )positioning based on Modbus RTU command (to slow for send stop command). VFD logic input and analog setpoint input must be used. Then please post your machine setup and application type. Some type of VFD+encoder+PLC based application posted in forum topics. You must define what you need to do with this VFD+Encoder+PLC. Quote Link to comment Share on other sites More sharing options...
MVP 2022 Ausman Posted May 30, 2021 MVP 2022 Report Share Posted May 30, 2021 11 hours ago, kratmel said: You must define what you need to do with this VFD+Encoder+PLC. And also tell us what models of each of those items. Quote Link to comment Share on other sites More sharing options...
Unitronics Motion Products Posted June 9, 2021 Report Share Posted June 9, 2021 On 5/28/2021 at 6:11 PM, Eliran said: Is there any example/tutorial that learn how to control an AC motor with VFD and encoder, using PLC? Basiclly you are right, but... Unitronics is now in the process of imlementing a new VFD product line (UMI-B7) That VFD support Encoder extention cards and support Close-loop. (Position and Velocity ) including "Standstill" capability. If you need more information please contact Support@unitronics.com and provide more information about the application. Quote Link to comment Share on other sites More sharing options...
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