4-2 Function Mode Overvoltage LAD Stop Function •This function helps avoid an overvoltage trip of the Inverter due to regenerative energy from the motor during deceleration. •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 = 1), the Inverter stops deceleration temporarily once the main circuit DC voltage has reached the overvoltage LAD stop level, which is lower than the overvoltage level.
Deceleration then resumes if the voltage level falls below the overvoltage LAD stop level. •With the overvoltage LAD stop function enabled (b130: 01), the actual deceleration time becomes 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. 4 Functions Main circuit DC voltage Overvoltage LAD stop function level Overvoltage level Time Output frequency Deceleration suspended Time Deceleration restarted 4-38 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 (Inverter DC voltage) 200-V class: 380 V 400-V class: 760 V V Deceleration suspended