Developing Full-digital Servo System for RSP Based on PMAC

Steady follow-up control and high overprint precision, that puzzled designer long ago, are the key technology for RSP (rotary screen printing). This paper puts forward and realizes the high speed follow-up control of RSP based on PMAC. The system makes up of PMAC (programmable multi-axis controller), Panasonic´s AC servo motor, a photoelectric encoder and atc. The encoder is mounted on principal axis of the main printing machine for position feedback, and the print roller will follow it to move with high precision of position under the control of PMAC. The principles of the position loop and the electronic gear of full-digital servo system are analysed, and a digital method for realizing the position control loop and the electronic gear is proposed. Finally, we analysed model of RSP follow-up control system and the performance of the system. By adjusting the parameter of the hardware and software, the exact synchronous control is realized. In addition, the Servo System was proved reasonable and applicable by positioning test on the prototype.