4-2 Function Mode Overvoltage Protection Function During Deceleration •This function helps avoid an overvoltage trip due to regenerative energy from the motor during deceleration. •You can set whether to enable or disable this function with overvoltage protection function selection during deceleration b130. •If overvoltage protection function selection b130 is set to "01" (enabled: DC voltage constant control), the Inverter automatically decelerates while keeping the main circuit DC voltage rise due to deceleration start at the overvoltage protection function level setting (b131). •If overvoltage protection function selection b130 is set to "02" (enabled:
with acceleration), the main circuit DC voltage increases because of deceleration start. When the main circuit DC voltage exceeds the overvoltage protection function level setting (b131), the Inverter starts acceleration according to the setting of overvoltage protection parameter b132. After that, when the main circuit DC voltage falls below the b131 level, the Inverter starts deceleration again.
4 Functions (Example 1) When b130 = 01 (Example 2) When b130 = 02 Main circuit DC voltage (V) Main circuit DC voltage (V) Overvoltage protection level (b131) Overvoltage protection level (b131) Time (s) Output frequency (Hz) Time (s) Output frequency (Hz) Deceleration started Time (s) Accelerates according to b132. Note 1: With this function enabled, the actual deceleration time may be longer than the set value. Particularly with b130 = 02, if b131 is set too low, the Inverter may not decelerate. Time (s) 4-75 Parameter No. Function name Data Default setting Unit b130 Overvoltage protection function selection during deceleration 00: Disabled 01:
Enabled (DC voltage constant control) (example 1) *2 02: Enabled (with acceleration) (example 2) 00 b131 Overvoltage protection level during deceleration *1 200-V class: 330 to 390 400-V class: 660 to 780 380/760 V b132 Overvoltage protection parameter 0.10 to 30.00: Set the acceleration rate applied when this function is enabled. 1.00 s b133 Overvoltage protection proportional gain setting 0.00 to 2.55: Proportional gain for DC voltage constant control (b130 = 01 only) 0.50 b134 Overvoltage protection integral time setting 0.000 to 9.999/10.00 to 65.53: Integral time for DC voltage constant control (b130 = 01 only) 0.060 s DC voltage kept constant