6-12 Measures Against Overvoltage; Regenerative Braking Function; Braking Resistor Electronic Thermal Function - Omron M1 Series User Manual

6-12 Measures Against Overvoltage

6-12-1

Regenerative Braking Function

• During motor deceleration and elevator descent, regenerative energy sometimes is returned to the
inverter and an overvoltage is detected due to an excessive regenerative amount.
• The regenerative braking function uses the built-in or an external regenerative braking resistor to de-
crease the internal Main Circuit DC Voltage of the inverter by converting the regenerated energy
from the motor into heat via external braking resistors.
• The 3G3M1 Series has a built-in regenerative braking circuit and a regenerative braking function op-
erates at all times regardless of whether the inverter is running or has stopped.
6-12-2

Braking Resistor Electronic Thermal Function

• Either use a braking resistor with thermal contact or use the braking resistor electronic thermal func-
tion for overheat protection of the external braking resistor.
• Use the braking resistor electronic thermal function by setting each of Electronic Thermal for Braking
Resistor Discharging Capacity (3004Hex-33Hex), Electronic Thermal for Braking Resistor Allowable
Average Loss (3004Hex-34Hex) and Braking Resistor Resistance (3004Hex-35Hex). These values
are determined by inverter model and type of braking resistor.
• To use the regenerative braking function, set Anti-regenerative Control Function Selection
(3008Hex-46Hex) to "0: Disable."
Parameter No.
3004Hex-33Hex
3004Hex-34Hex
3004Hex-35Hex
3017Hex-3EHex
Related function
• Set the Electronic Thermal for Braking Resistor Discharging Capacity (3004Hex-33Hex) and Elec-
tronic Thermal for Braking Resistor Allowable Average Loss (3004Hex-34Hex) by the following for-
mula depending on how the braking load is applied.
M1 Series EtherCAT Type User's Manual (I670)
Function name
Electronic Thermal for Braking
Resistor Discharging Capacity
Electronic Thermal for Braking
Resistor Allowable Average
Loss
Braking Resistor Resistance
Braking Resistor Thermal
Monitor
Data
1 to 9000
32767: Disable
0.001 to 99.99
0.01 to 999
0.0 to 100.0
Anti-regenerative Control Function Selection
(3008Hex-46Hex)
6 Basic Settings
Default data Unit
32767 kWs
0.001 kW
0.01 Ω
0.0 %
6-67
6