4-2 Function Mode Overvoltage LAD Stop Function This function helps avoid an overvoltage trip due to regenerative energy from the motor during deceleration. Note that the actual deceleration time may be longer than the set value. If DC voltage exceeds the set level, the Inverter stops deceleration. The aim of this function is the same as the overvoltage control function during deceleration, described in b055 and b056. However, these functions have different deceleration characteristics and you can select either function according to your system. 4 Functions •Select to enable or disable the overvoltage LAD stop function in b130. •Adjust the overvoltage LAD stop function level in b131.
•The main circuit DC voltage rises because of regenerative energy from the motor once deceleration starts. With the overvoltage LAD stop function enabled (b130: 01), the Inverter stops deceleration temporarily once the main circuit DC voltage has reached the overvoltage LAD stop function level, which is lower than the overvoltage level. Deceleration then resumes if the voltage level falls below the overvoltage LAD stop function level. •With the overvoltage LAD stop function enabled (b130: 01), the actual deceleration time may become longer than the set value (F003/F203). •This function does not aim to keep the main circuit DC voltage level constant.
Therefore, an overvoltage trip may occur if the main circuit DC voltage rises rapidly because of rapid deceleration. Internal DC voltage Overvoltage level Overvoltage protection level during deceleration Time Output frequency Deceleration suspended Time Deceleration restarted •The fluctuation of the internal DC voltage of this function is larger compared to the overvoltage control function during deceleration, described in b055, b056, b133, and b134. These functions aim to avoid overvoltage during deceleration, and you can select either function according to your system. 4-41 Parameter No. Function name Data Default setting Unit b130 Overvoltage LAD stop function 00: Disabled 01:
Enabled 00 ⎯ b131 Overvoltage LAD stop function level setting 200-V class: 330. to 395. 400-V class: 660. to 790. 380/760 V Decelerati