EMC2 home/limit switches... only acting as limit?

[NB70]

Hi there,
I think it might be something to do with your MAX_LIMIT and MIN_LIMIT setting, and the directions of your HOME_SEARCH_VEL. MAX_LIMIT and MIN_LIMIT are the software limits (some people use only the software limits and no physical switches), if you try command a move that goes outside these limits the machine should stop.
When you are confident everything is working you can set MAX_LIMIT closer to the actual limit of your machine (but always less than where your physical maximum limit switch is).

You have HOME = 0.0, but your home search velocity is positive, so your machine moves to the positive limit switch ( at position 3.0) during homing your machine. So the first thing I would try is to change the signs of HOME_SEARCH_VEL and HOME_LATCH_VEL if you want to home at 0.0.

This is the section from my config file (units are MM) - the limits of the table are 0 and 794mm. My physical limit switch is set further out than 794mm - so I can machine out to 794 without tripping it. It homes at 0.0 - so home search velocity is negative. Home latch velocity is positive to move it forward off the limit/homing switch.

[AXIS_0]
TYPE = LINEAR
HOME = 0.0
MAX_VELOCITY = 20.0
MAX_ACCELERATION = 100.0
STEPGEN_MAXACCEL = 525.0
SCALE = -640.0
FERROR = 1
MIN_FERROR = .25
MIN_LIMIT = -0.001
MAX_LIMIT = 794.0
HOME_OFFSET = 0.000000
HOME_SEARCH_VEL = -20.000000
HOME_LATCH_VEL = 0.781250
HOME_IGNORE_LIMITS = YES
HOME_SEQUENCE = 1