robert mooli
Member
Hi folks , now we had a project were we had to install a micromaster 440 , this drives are to be controlled by an external 4 to 20 Ma form a PID conroller the process variable input to the PId conroller is Flow measurement , the process is such that when the flow is lower the set point the VSD reduces speed and vise vasa . we have set the P value to 70 I to 5 and D to Zero but , whenever the VSD is started it trips immediately as the controller output Ramps up very first and not stable . could any one help and come out of this please any suggestions are welcome.