4-2 Function Mode Regenerative Braking Function •With the built-in regenerative braking circuit, this function allows an external braking resistor to consume the motor's regeneration energy as heat. This function is useful for a system in which the motor works as a generator when it is rapidly decelerated. •To use this function, configure the following settings. 4 Functions * The regenerative braking function ON level conforms to the voltage setting for the Inverter's internal converter (DC unit). •When using the regenerative braking function, mount the optional braking resistor between terminals P/+2 and RB, in addition to the settings above.
* The above usage rate of the regenerative braking function is the figure for using the optional braking resistor (3G3AX-RBA, RBB, RBC). •When using an external regenerative braking unit, set the usage rate of the regenerative braking function to 0.0% (b090: 0.0) or disable the regenerative braking function selection (b095: 00). Do not mount the braking resistor between terminals P/+2 and RB. 4-37 Parameter No. Function name Data Default setting Unit b090 Usage rate of regenerative braking function 00: Does not operate. 01 to 100.0: A BRD usage rate for 100 seconds can be set, in increments of 0.1%. If the set usage rate is exceeded, a braking resistor overload trip (E06) occurs.
t1 t2 t3 ON ON ON 100 s BRD operation (t1 + t2 + t3) Usage rate (%) = × 100 100 s 0.0 % b095 Regenerative braking function operation selection 00: Disabled (This function is not active.) 01: Enabled during operation (This function is active.) Disabled during stop (This function is not active.) 02: Enabled during both operation and stop (This function is active.) 0.0 b096 Regenerative braking function ON level 200-V class: 330 to 380 * 400-V class: 660 to 760 * (Inverter DC voltage) 200-V class: 360 V 400-V class:
720 V V t1 t2 t3 ON ON ON 100 s BRD operation (t1 + t2 + t3) Usage rate (%) = × 100 100 s t3 Model 200-V class 400-V class 2002 2004 2007 2015 2022 2037 2055 2075 4004 4007 4015 4022 4037 4055 4075 Minimum resistance (recommended) 100 Ω 50 Ω 35 Ω 17 Ω 180 Ω 100 Ω 70 Ω Usage rate of regenerative braking function * 10%