Chapter 4
Explanation of Functions
4-80
4.2.89 Optimum accel/decel operation function
The optimum accel/decel operation function eliminates the need for
acceleration time and deceleration time settings for the motor
operation by the inverter. Conventional inverters required you to
adjust the acceleration and deceleration time according to the status
of the load. Based on fuzzy logic, this function automatically adjusts
the acceleration and deceleration time to
minimize the inverter performance. This function adjusts the acceleration time so that during acceleration, the inverter
output current does not exceed the current level specified by the deceleration rate at overload restriction (when the
overload restriction is enabled) or about 150% of the inverter's rated current (when the overload restriction is
disabled). This function adjusts the deceleration time so that, during deceleration, the output current does not exceed
about 150% of the inverter's rated current or the DC voltage in the inverter circuits does not exceed about 370 V (in
the case of 200 V class models) or about 740 V (in the case of 400 V class models). Thus, this function automatically
adjusts the acceleration and deceleration time appropriately on a real-time basis even when the motor load or the
motor's moment of inertia changes.
Item
Function code
Data
Description
Operation mode selection
A085
00
Normal operation
01
Energy-saving operation
02
Fuzzy operation
Observe the following precautions and instructions when using this function:
Note 1: This function is not suited for machines that require fixed acceleration and deceleration times. This function
varies the acceleration and deceleration time according to the changes in the load and the moment of inertia.
Note 2: If the inertial force produced in the machine becomes about 20 times as high as the motor shaft capacity, the
inverter may trip. If this occurs, reduce the carrier frequency.
Note 3: Even when the inverter is driving the same motor, the actual acceleration/deceleration time always changes
according to current fluctuation.
Note 4: The selection of the fuzzy acceleration/deceleration function is valid only when the control mode is a V/f
characteristic control mode. When a sensorless vector control mode is selected, the selection of this function
is ignored (normal operation is performed).
Note 5: When the fuzzy acceleration/deceleration function is enabled, the jogging operation differs from the normal
jogging operation because of fuzzy acceleration.
Note 6: When the fuzzy acceleration/deceleration function is enabled, the deceleration time may be prolonged if the
motor load exceeds the inverter's rated load.
Note 7: If the inverter repeats acceleration and deceleration often, the inverter may trip.
Note 8: Do not use the fuzzy acceleration/deceleration function when the internal regenerative braking circuit of the
inverter or an external braking unit is used. In such cases, the braking resistor disables the inverter from
stopping deceleration at the end of the deceleration time set by the fuzzy acceleration/deceleration function.
Note 9: When using the inverter for a motor of which the capacity is one class lower than that of the inverter, enable
the overload restriction function and set the overload restriction level to 1.5 times as high as the rated current
of the motor.
A044/A244/A344: V/F characteristic curve selection,
1st/2nd/3rd motors
A085: Operation mode selection
b021/b024: Overload restriction operation
mode (1) (2)
b022/b025: Overload restriction setting (1) (2)
Related code
Содержание SJ700D-004L
Страница 16: ...Contents Appendix Appendix A 1 Index Index Index 1 ...
Страница 44: ...Chapter 2 Installation and Wiring 2 23 Memo ...
Страница 70: ...Chapter 3 Operation 3 25 Memo ...
Страница 248: ...Chapter 5 Error Codes 5 11 Memo ...
Страница 256: ...Chapter6 Maintenance and Inspection 6 7 Memo ...
Страница 282: ...Chapter 8 List of Data Settings 8 17 Memo ...