what are the possible causes of following errors in MAX? Are there any references on how to use MAX?

[fozzy]

Hi, it's me again.

I've checked the encoder response in MAX (-ve ccw, +ve cw) and it seems fine. But when the motor moves MAX will generate a following error message. Is my encoder causing the problem or have I made a mistake in the settings? I've checked the connections to the encoder and they are all correctly wired.Could there be other causes of following errors?

The motor does stop earlier when I reduced the following error value, so I'm assuming that the motor stops only when it has reached the set number of following errors and NOT because the motor has reached the target position. Any help is greatly appreciated.

Thank you.

[Kyle_V]

It may be that the 7344 is missing encoder values, or that the motor isn't tuned correctly. The first thing I'd like for you to check is that the Encoder Counts per Revolution input to the Axis Settings menu in MAX is set correctly (I believe it defaults to 2000 counts). To check this, you can rotate the motor by hand one revolution to see how many counts have accumulated. Most encoders are either 2000 counts per rev or 4000 counts per rev.

Once you have that confirmed, autotune the motors and make sure the values for Kp, Kd, and Ki are resonable. (Kd is often around 10x Kp) Once these are set, start your motors moving slowly and observe the following error. This can be seen under the Advanced tab of the 1D Interactive menu. If it is slowly incrementing, t
hen your're missing counts. If it is negative, then the encoder phases may be backward. If there is no following error, or the count stays constant, then try increasing the speed. It could just be that your encoder sends pulses too fast for the 7344 to read.

Let me know how it goes.

Kyle V

[fozzy]

hi,
i have considerable problem in autotuning the servo. could you give me hints or starting values on how to tune the motor manually?

thanks.