Hi Ahmed,
The powerdump circuit is only needed if there's a risk that the voltage of the powersupply goes beyond the maximum voltage for the drive while deccelerating. It's not a part of this particular problem so leave it for now ;-)
It's really hard to guess what the problem is here.... You still haven't told me if it works at any speed or if you always get O-counts, no matter what the speed is. Try running at 100rpm or something for a minute, then check the O-count.
Also, you should be aware that the max frequency the chip can keep up with drops when you use the analyse function in the software so don't have that turned on while trying to figure out this problem.
Are you using shielded cable for the encoder? Shield grounded at one end only?
Don't worry about tuning just yet - you have to figure out this problem first.... I'll grab a screenshot next time I fire mine up.
/Henrik. |