5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
• Auto torque boost
This function automatically optimizes the output voltage to fit the motor with its load. Under light load, auto torque
boost decreases the output voltage to prevent the motor from over-excitation. Under heavy load, it increases the
output voltage to increase the output torque of the motor.
• This function controls in accordance with motor characteristics. Therefore, set the base frequency 1
(F04), rated voltage at base frequency 1 (F05), and other pertinent motor parameters (P01 through
P03 and P06 through P99) in line with the motor capacity and characteristics, or else perform auto-
tuning (P04).
• When a special motor is driven or the load does not have sufficient rigidity, the maximum torque might
decrease or the motor operation might become unstable. In such cases, do not use auto torque boost
but choose manual torque boost using F09 (F37 = 0 or 1).
Auto energy saving operation (mode selection) (H67)
Automatically controls the output voltage to the motor in order to minimize the total motor and inverter loss.
(Depending on the motor and load characteristics, this may not be effective. Verify the benefits of using auto energy
saving operation for the actual application.)
Auto energy saving control can be selected from that applied when performing constant speed operation only, and
when performing constant speed operation and acceleration/deceleration.
Auto energy saving operation
When performing constant speed operation only (when accelerating and
decelerating, torque boost or auto torque boost is applied with F09 based on
the F37 setting)
When performing constant speed operation and acceleration/deceleration
(Note: This should be restricted to acceleration/deceleration operation with a
light load.)
If using auto energy saving operation, the response when changing the speed from constant speed operation will
be slow. If sudden acceleration/deceleration is necessary, use after canceling auto energy saving operation
beforehand.
• Use auto energy saving operation at base frequency of 60 Hz or lower. By setting the base frequency
to 60 Hz or higher, energy saving operation may be less effective, or offer no benefit. Auto energy
saving operation operates at a frequency less than the base frequency. Auto energy saving operation
will be disabled if the frequency is equal to or higher than the base frequency.
• This function controls in accordance with motor characteristics. Therefore, set the base frequency 1
(F04), rated voltage at base frequency 1 (F05), and other pertinent motor parameters (P01 through
P03 and P06 through P99) in line with the motor capacity and characteristics, or else perform auto-
tuning (P04).
• Under speed sensorless vector control, auto energy saving operation is disabled.
Stop frequency (Detection mode and holding time) Refer to F23.
For details about the setting of the stop frequency (detection mode and holding time), refer to the description in the
function code F23 section.
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