How do I home a motor with an absolute feedback device in the AKD. That is today I hook it up to a load, start moving it to a switch and then call that position zero. Whenever I save that position today, cycle power, a new position comes up.
Comments & Answers
jcoleman02 said ...
The question is a little vague. Is it a multi-turn absolute encoder, or a single turn absolute feedback device? Is the motor being driven past the roll-over point?
For single turn feedback devices in an application where the motor will never pass one revolution, you can use homing mode 13. This just uses the current position value as the position value and turns on the home done and home found bits.
For mulit-turn absolute encoders in an application where the motor will never pass the multi-turn roll-over point, you don't ever need to run a homing routine. Just use the FB1.OFFSET parameter to offset the position value to put zero wherever you want it and save it. You can make a move to zero, but DON'T EVER home it.
For multi-turn absolute encoders in an application where the drive will be rebooted after passing the roll-over point, you must use homing as if the feedback was not absolute.