Homing


TroubleShooting

If you get Homing alarms when homing there can be several causes which you should investigate.


  • Ensure all homing sensors show Low in the F1 screen when the sensor is not triggered
  • Ensure that the homing sensors change to High when triggered by the axis.
  • If when you home the Axis moves slowly backwards 10mm and alarms instead of moving towards the homing sensor then your homing sensor is either set High in on the F1 page or the sensor is faulty.
  • If you get a homing alarm when the axis is backing off a sensor the most likely cause is the deceleration of the axis took it beyond 10mm. Reducing the Homing Feedrate will fix this problem.
  • If you get a hard limit alarm during homing an axis it is most likely that you triggered the homing sensor and then moved past it to the other side and the sensor went low again. In this case the axis will not back off the sensor because it is already low and when it tries to pull off the sensor it will trigger a hard limit alarm. The sensor must remain high until the axis backs off the homing sensor. Ensure your sensor remains high for a minimum of 10mm once triggered. Reducing homing speed or increasing axis acceleration can also help if this is not possible.
  • If after homing the machine sits and Flashes homing but does nothing the most likely cause is Auto Tool Zero is turned on but you have not set it up correctly. If disabling Auto Tool Zero fixes the homing error but you have a tool setter installed please check your tool setter settings as this is where the problem lies.
  • If after homing the machine sits and flashes Homing but does nothing you may have a tool changer enabled on your machine but have not set it up correctly. Some tool changer types home during the homing sequence. Change the tool changer to manual until you have completed the install of your Tool Changer.
  • If after homing the machine sits and flashes Homing another cause can be that you have a Soft limit issue. This can be that the tool setter is outside the soft limits or you have set the soft limits for the Z axis preventing it moving Z axis to machine coordinate Z0. The Z axis will rise to Z0 before moving the the tool setter and if your soft limits prevent the then the machine with stop and eventually time out. Ensure that all axis soft limits allow movement to the tool setter location and the Z axis is allowed to move up to Z0 and down far enough to touch off the tool on the tool setter.
  • If unsure how your Homing sensor should be wired please see our Quick Start guide on Homing sensor Identification.
  • On a software slave axis it is very important that the right sensor is assigned to the right motor or you will get very strange results when homing the slaved axis. Use the technique shown in the Homing video below (11:20 min) to identify which motor of a slaved axis is which and which sensor is which. Do not Assume!