5-12 Regenerative Braking Function; Braking Resistor Electronic Thermal Function - Omron M1 Series User Manual

5-12 Regenerative Braking Function

5-12-1
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.
5-12-2

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 the discharge capacity, allowable
average loss and resistance value to each of F50, F51 and F52. These values are determined by
inverter model and type of braking resistor.
• To use the regenerative braking function, set Anti-regenerative Control Function Selection (H69) to
"0: Disable."
Parameter No.
F50
F51
F52
W161
Related function
• Set the Electronic Thermal for Braking Resistor Discharging Capacity (F50) and Electronic Thermal
for Braking Resistor Allowable Average Loss (F51) by the following formula depending on how the
braking load is applied.
 When braking load during deceleration decreases with time
How to apply a braking load
M1 Series Standard Type User's Manual (I669)
Function name
Electronic Thermal for Braking
Resistor Discharging Capacity
Electronic Thermal for Braking
Resistor Allowable Average
Loss
Braking resistor electronic
thermal braking resistance
Braking resistor thermal cal-
culated value
Electronic Thermal for Braking
Resistor Discharging Capacity
(F50) =
Braking time (s) × Motor capacity (kW)
Data
1 to 9000
32767: Cancel
0.001 to 99.99
0.01 to 999
0.0 to 100.0
Anti-regenerative Control Function Selection (H69)
Allowable average loss
2
5 Basic Settings
Default data Unit
32767 kWs
0.001 kW
0.01 Ω
0.0 %
Thermal braking resistance
value
Electronic Thermal for Braking
Resistor Allowable Average
Loss (F51) =
%ED(%)
× Motor capacity (kW)
100
2
5-75
5