Overload Protection in Low Speed Range

What does E38. mean?

This fault occurs when the inverter's built-in electronic thermal function detects an overload specifically during operation in an extremely low speed range (0.2 Hz or lower). This indicates that the motor is experiencing excessive load at low speeds, where cooling efficiency might be reduced, or that thermal parameters are not correctly configured for low-speed conditions.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If applicable, consider using a dedicated inverter motor or adjusting motor parameters (H003/H203, H004/H204) for better low-speed performance.

2. 4

   Ensure the cooling system is clean and functioning efficiently to prevent heat build-up at low speeds.