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Error Message F18

Valid for S300, S400, S600, S700

Display Meaning Possible cause Measure S300/S700 Measure S400/S600
F18  Brake circuit

External brake resistor selected, but the internal one is used. 

Check setting on screen page Basic settings Check setting on screen page Basic settings

Destroyed brake transistor 

Return the servo amplifier to manufacturer for repair 

Return the servo amplifier to manufacturer for repair