Closed loop stepper motors on duet2
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Hello, I occasionally read on the forum. Now I have a question and Ryan from Ooznest told me to place it here.
I try to connect closed loop stepper motors (2phase) to a duet2 with an expansion breakout board. Before I had normal stepper motors with external drivers on the duet.
When I use the jog commands (G0) with the buttons it works. When I use a other command,like homing (G1), it goes wrong. Stuttering movements and the distance is no longer correct. The distance is ok when i use the buttons.If i set the closed loop running off with a switch, same result.
The strange thing is that the driver does not give an alarm for the missed steps. So the driver does not see the missed steps.
When I block the motor, the driver go in alarm because of missed steps, so that works.I tested with a 3phase motor/driver, also closed loop and this works fine.
I tested the 2phase motor with a normal driver and this works also fine. So the problem is the driver or the settings?G1 command with higher speed works.
So it's somewhere a setting, but which one? I have no idea.
The seller gave me software to program the driver. Here I can see that if I give 5000 pulses with a speed of 15000,
the driver also gives 5000 pulses. But when I give 5000 pulses at speed 1500, then only 800 pulses are counted.
So only higher speed as 12000 works.I'm using following motor and drivers:
2phase LC57H2100 from Lichuan
LCDA257S driver from Lichuan
Shenzhen Xinli Chuan Electric Co., Ltd.
bought on Aliexpress.Motor encoder resolution is 1000 (PPR)
Step angle 1.8°Does anybody have experience with this? Or an idea how to solve this?
Sorry for my english.
Thanks,
Davy -
Most external drivers need slower step pulse timings than RRF provides by default. Consult the stepper driver manual for details, and use the M569 T parameter to configure them in RRF.
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Does that mean in that i must set a T parameter with higher numbers? Any idea how high? I'm a newbee in this material
