Panasonic servo systems have over 200 parameters, but for most control applications, mastering only a few is sufficient. Servo systems offer various control modes, including position control, speed control, torque control, and combinations of these three. However, servo systems are primarily used for precision positioning, followed by torque control. Speed control often utilizes frequency converters, as their performance is sufficient and their price is lower than that of servo systems. This project focuses on positioning control.
Panasonic servo motors are used for positioning control. You need to be familiar with and master the setting methods for the following parameters:
Pr0.00: Servo rotation direction switching. Often, the servo drive needs to change the rotation direction. Simply change the value in Pr0.00 from "1" to "0", or from "0" to "1" (the factory default value is "1").
Pr0.01: Servo control mode setting. Position control is the default mode (Pr0.01=0). Other mode settings are as follows:
Pr0.07: Servo control pulse input mode. The PLC sends high-speed pulses to the servo driver in several ways: one pulse for forward rotation and one pulse for reverse rotation; one pulse only, plus a direction control signal (high or low level); or two-phase pulses with a 90° phase difference. Pr0.07 can be set to "1", "3", "0", or "2". It can be seen that except for setting it to "3", which requires only one pulse for positioning control, the other three require two pulses. For single-axis control (i.e., one servo system), the Mitsubishi PLC has no problem. If it is two-axis control, Pr0.07 must be set to "3" (default value is "1"). Therefore, this parameter generally needs to be set. This parameter, in conjunction with Pr0.06, allows selection of the input pulse polarity.
Pr0.08: The number of command pulses required for each revolution of the motor. This parameter is related to the precise control of the positioning distance during PLC programming. In other words, it specifies how many pulses the PLC sends for the servo motor to rotate once, driving the lead screw to rotate. Assuming the lead screw pitch is 5mm, each pulse value set in Pr0.08 (default 10000) sent by the PLC will cause the lead screw to move the motion platform by 5mm. Parameters Pr0.09 and Pr0.10 achieve the same function and are suitable for situations where the number of PLC pulses and the movement distance are not divisible. In fact, mastering Pr0.08 makes everything possible.
Pr5.04: Servo positioning. It typically has limit switches at both ends. If these are installed, Pr5.04 needs to be set from "1" to "0"; otherwise, the limit switches will not function. If limit switches are not needed, this parameter is not required.
