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5 Basic Settings
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
5-12 Measures against Overvoltage
5
5-12-2 Regenerative Braking Function
• 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.
b096
Regenerative
Braking ON Level
200-V class: 330 to 380 VDC
*1
200-V class:
360 V
V
400-V class: 660 to 760 VDC
*1
400-V class:
720 V
*1.Regenerative Braking ON Level refers to the voltage setting for the internal converter (DC unit) of the inverter.
Parameter
No.
Function name Data Default data Unit
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