Hi all,
I’m currently using a PCI-7340 card to control four servo motors and have been troubleshooting an issue for some time. When I use the “1D Interactive” function in NI-MAX to configure one of the motors in velocity mode, the motor speed from the encoder information consistently reaches only about 70% of the target value I set. For example, setting the target speed to 200 rpm results in a steady measured speed of around 140 rpm, and setting 400 rpm gives about 280 rpm. Because of this discrepancy, the following error accumulates quickly and eventually exceeds the threshold, causing the test to stop.
I’ve tried adjusting the “counts per revolution” setting under Encoder Setup, but it doesn’t seem to make any difference—the position still indicates 4000 counts per revolution even when I manually rotate the motor after changing the setting.
Any suggestions or insights would be greatly appreciated!
Thank you in advance.
Best,
Yin
