Line-to-Line Resistance Fault

What does Er - 04 mean?

This Auto-Tuning fault indicates that the process could not complete within the specified time, or the resistance measurement result fell outside the acceptable parameter range. This typically points to issues with motor wiring, motor integrity, or an active mechanical load during tuning. Inaccurate resistance data will compromise motor control and efficiency.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If the motor and machine are connected, disconnect the motor from the mechanical load and re-attempt Auto-Tuning.