ST600s | Err.20, what does this message mean, what can be done?

If the error message Err.20 appears on the display of the frequency inverter, it is a motor autotuning error.

Causes:

• The motor power does not match the power of the frequency inverter. This error can easily occur if the difference between the two is more than five power classes.
• Motor parameter is not set correctly.
• The parameters obtained by autotuning differ greatly from the default parameters.
• Autotuning timeout.

Solutions:

• Change the VFD model or adopt the V/f mode for control by P00.00 = 2.
• Set the correct motor type in P02.00 and parameters P02.01 – P02.05 on the nameplate.
• Remove the engine load and perform auto-tuning again.
• Check motor wiring and parameter setting.
• Check whether the upper frequency limit P00.04 is greater than 2/3 of the nominal frequency.

If none of these error sources apply, please contact technical support.

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