EDDY Sensor Troubleshooting Guide

EDDY Sensor Common Issue Resolution Guide

Issue One: Error Error during homing z: Eddy current sensor error during homing

When encountering this error, please try the following methods in order:

Method A: Adjust Drive Current

1. Open the printer.cfg file.
2. Find the reg_drive_current = parameter near the bottom of the configuration.
3. Increase or decrease its current value by 1 (e.g., if it's 15, change it to 16 or 14).
4. Important: Enter the calculated result directly (e.g., 16), do not enter an expression (e.g., 15+1).
5. Save the file and restart the printer, then retest homing.

Method B: Adjust Probe Offset If Method A is ineffective:

1. In printer.cfg, locate the [probe_eddy_current fly_eddy_probe] configuration section.
2. Increase the z_offset: value there (default is 1.0, try 2.0 or 2.5 first).
3. Crucial Notes:
   • This parameter must only be configured here once; do not configure it elsewhere.
   • It's recommended not to exceed 3.0. The specific value depends on your machine's hardware.
4. Save and restart the printer, then test.

Method C: Lower I2C Communication Speed If Method B is still ineffective:

1. In the same [probe_eddy_current fly_eddy_probe] section, find the line i2c_speed: 4000000.
2. Comment it out by adding a # at the beginning of the line (i.e., change it to #i2c_speed: 4000000).
3. Save and restart. After restarting, it is strongly recommended to perform a probe calibration again.

4. Additional Step: If homing succeeds, but your set z_offset value is greater than 2.0, you need to also modify the corresponding parameter in the eddypz.cfg file.

---

Issue Two: Prompt !! probe_eddy_current sensor not in valid range

This error indicates the probe reading is outside the valid range.

• Main Cause: After enabling the EDDY probe, the probing heights set elsewhere (e.g., in the [Horizontal_move_Z] or [bed_mesh] modules) might not take effect, causing the probe to move beyond its physical range.
• Solution: Check and ensure that all configuration heights involving probe deployment are within the sensor's valid range.

---

The final section ("General Configuration Suggestion") has been modified as per your request, emphasizing its empirical, non-universal nature and the correct operational approach.

---

Important Reminders

• Empirical Reference for z_offset Value: Based on numerous cases we've handled, setting the initial z_offset value in [probe_eddy_current fly_eddy_probe] to 2.5 often allows many EDDY sensors to become operational more quickly. You can use this as an efficient debugging starting point.
• Important Clarification: This is not a universal fixed value nor an official default configuration. The optimal probe offset strictly depends on your specific machine hardware (e.g., probe mounting position).
• Core Principle: The steps provided in this document are a path to help you troubleshoot and resolve issues. The ultimate goal is to obtain accurate configuration parameters for your own machine through systematic calibration.

---