5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
Acceleration/deceleration filter time constant (d86) (dedicated setting for V/f control)
Sets the primary delay filter time constant for outputting the output frequency lamp function when accelerating and
decelerating. Specify this setting if mechanical problems arise due to overshoot or undershoot when reaching the
target frequency or when stopping. By setting a large value, the rate of output frequency change stabilizes, but
responsiveness deteriorates.
This setting is effective only under V/f control (F42 = 0 to 2). If performing other than V/f control (F42 = 0 to 2), use
a speed control speed command filter (d01, A43, b43, r43).
• Data setting range: 0.000 (filter disabled): 0.001 to 5.000 (s)
Acceleration/deceleration time ratio setting with analog input (E61 to E63, E66)
By setting “12: Acceleration/deceleration time ratio” for analog input terminal [12], [C1] (C1 function) (V3 function),
or [V2], the applicable analog input (0 to 100%) is multiplied by the selected acceleration/deceleration time in real
time to set the acceleration/deceleration time ratio. This is also valid for S-curve acceleration/deceleration and curve
acceleration/deceleration. This setting is reflected immediately even during acceleration and deceleration. The data
range is limited to plus polarity, and the minus side is recognized as 0. This setting is not reflected when performing
jogging operation or when performing a forced stop.
Torque boost 1 (Refer to F37)
For details of torque boost 1 setting, refer to the section of function code F37.
Electronic thermal overload protection for motor 1 (motor characteristics selection,
operation level, thermal time constant)
Sets the motor temperature characteristics (characteristic selection (F10), thermal time constant (F12)) and the
operation level (F11) for motor overload detection (electronic thermal overload relay function based on inverter
output current).
If a motor overload is detected, the inverter is shut off to protect the motor, and motor overload alarm 0l1 occurs.
If the electronic thermal overload relay function is set incorrectly, the motor will not be protected, and may
burn out.
Temperature characteristics of motor is used for motor overload early warning “OL” as well. Even if only
overload early warning is used, it is necessary to set temperature characteristics of the motor (F10, F12)
( Function code E34)
For disabling motor overload alarm, set F11 = 0.00 (Disable).
If using a dedicated Fuji motor for vector control, motor overheat protection using an NTC thermistor will
activate, eliminating the need for an electronic thermal overload relay. Set F11 to 0.00 A (disabled), and
connect the motor NTC thermistor to terminal [V2]. Furthermore, for PTC thermistor built-in motor, by
connecting PTC thermistor to terminal [V2], it is possible to protect the motor. Refer to H26 to find the
details.
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