Troubleshooting

If you receive Homing alarms, there can be several possible causes. Work through the checks below to identify the issue.

Initial Checks (Before Troubleshooting)

Before investigating a homing fault, confirm the following:

• All axes can be jogged in both directions at power-on

  • The machine cannot home if the motors do not move

  • If motors do not move, resolve the motor issue first

• All homing sensors show Low on the F1 screen when not triggered

• Each homing sensor changes to High when physically triggered by the axis

Common Homing Faults and Causes

Axis Moves Backwards ~10 mm and Alarms

• The homing sensor is set as High-in on the F1 page, or

• The homing sensor is faulty

   

Homing Alarm While Backing Off the Sensor

• The most common cause is axis deceleration exceeding 10 mm

• Reduce the Homing Feedrate to resolve this issue

   

Hard Limit Alarm During Homing

This usually occurs when:

• The homing sensor is triggered

• The axis moves past the sensor

• The sensor goes Low again

When this happens:

• The axis cannot back off the sensor because it is already Low

• A Hard Limit alarm is triggered

Solution:

• Ensure the homing sensor remains High for at least 10 mm after being triggered

• Reduce homing speed or increase axis acceleration if required

   

Homing Completes but Machine Flashes “Homing” and Does Nothing

Possible Cause 1 – Auto Tool Zero

• Auto Tool Zero is enabled but not configured correctly

Action:

• Disable Auto Tool Zero and test again

• If disabling fixes the issue and you have a tool setter installed, review and correct the tool setter setup

   

Possible Cause 2 – Tool Changer Enabled

• A tool changer is enabled but not configured correctly

• Some tool changer types home as part of the homing sequence

Action:

• Set the tool changer to Manual until installation and setup are complete

   

Possible Cause 3 – Soft Limit Issues

Soft limit problems can prevent the machine from completing homing.

Common examples:

• Tool setter is located outside soft limits

• Z-axis soft limits prevent movement to Machine Z0

During homing:

• The Z axis must rise to Machine Z0 before moving to the tool setter

• If soft limits block this movement, the machine will stop and eventually time out

Ensure:

• All axes can move to Machine Coordinate 0

• The Z axis can move up to Z0 and down far enough to contact the tool setter

• After homing, all axis positions remain within soft limits

This applies to X, Y, Z, A, and B axes.

Axis Moves in One Direction Only After Homing

• The axis home position is set outside the machine soft limits

   

Additional Notes

• If unsure how a homing sensor should be wired, refer to the Quick Start Guide – Homing Sensor Identification

• For software-slaved axes, it is critical that:

  • The correct sensor is assigned to the correct motor

  • The correct motor is identified as the master or slave