• To use the built-in regenerative braking function of the inverter, be sure to set both the Usage
Rate of Regenerative Braking (b090) and the Regenerative Braking Selection (b095).
Otherwise, the function cannot work.
• Setting the Regenerative Braking ON Level (b096) to the input power supply voltage or lower
causes the built-in regenerative braking function to be always active, which results in
overheating or burning of the braking resistor. Be sure to set this to a value higher than the
input power supply voltage multiplied by the square root of 2. Normally, do not set this value to
350 V or less for 200-V class and 700 V or less for 400-V class.
• To use the regenerative braking function, connect external braking resistor(s) or external
regenerative braking unit(s) according to the description of External Braking Resistor
Connection Terminal/Regenerative Braking Unit Connection Terminal in 2-3-4 Wiring for Main
Circuit Terminals on page 2-20. Be sure to install a circuit that detects overheating of the
braking resistor(s) and the regenerative braking unit(s) via alarm contacts (thermal relay
output terminals) and shuts off the input power supply of the inverter.
Parameter No. Function name Data Default data Unit
b090
Usage Rate of
Regenerative Braking
0.0: Regenerative braking not active
0.1 to 100.0
Set the usage rate of the regenerative
braking function in units of 0.1%.
Exceeding the set usage rate causes
a trip error.
0.0 %
b095
Regenerative Braking
Selection
00: Disabled
01: Enabled (Disabled during stop)
02: Enabled (Enabled during stop)
00 –
b096
Regenerative Braking
ON Level
200-V class: 330 to 380 VDC
*1
*1.Regenerative Braking ON Level refers to the voltage setting for the internal converter (DC unit) of the inverter.
Normally, use the default data.
200-V class: 360 V
V
400-V class: 660 to 760 VDC
*1
400-V class: 720 V
t1 t2 t3
ON ON ON
Regenerative
braking
function
activated
100 s
Usage rate [%] =
(t1+t2+t3)
100 s
×100
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