5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
Stop Frequency (Detection mode) (F38) (Under vector control with speed sensor only)
F38 specifies whether to use the actual speed or reference one as a decision criterion to shut down the inverter
output. Usually the inverter uses the detected speed. However, if the inverter undergoes a load exceeding its
capability, e.g., an excessive load, it cannot stop because the motor cannot stop so that the detected speed may
not reach the stop frequency level. If this happens, the inverter will be unable to stop. By specifying a setting that
allows judgment to made based on the speed command value, the command value is reached even if the detection
value is not, and therefore the inverter will come to a complete stop. If such a situation could arise, select the
reference speed that can reach the stop frequency level even if the detected speed does not, in order to stop the
inverter without fail achieving a fail-safe operation.
• Data setting range: 0 (Detected speed)
1 (Reference speed)
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