ST600 | Err.74, what does this message mean, what can be done?

If the error message Err.74 appears on the display of the frequency inverter, it indicates an undervoltage at analog input AI1.

Causes:

• The input voltage at AI1 is too low.
• Nothing is connected to AI1.

Solutions:

• Check the wiring of AI1.
• Set parameter P05.50 to 0 and connect AI1 directly to the +10V source for verification.
• Check parameter P08.59.

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

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