E6582175
F-69
6
6.19.4 Dynamic (regenerative) braking - For abrupt motor stop
f304 : Dynamic braking selection
f308 : Dynamic braking resistance
f309 : Dynamic braking resistor capacity
f626 : Over-voltage stall protection level
Function
The inverter does not contain a braking resistor. Connect an external braking resistor in the following
cases to enable dynamic braking function:
1) when decelerating the motor abruptly or if overvoltage tripping (op) occurs during deceleration
stop
2) when a continuous regenerative status occurs during downward movement of a lift or the winding-
out operation of a tension control machine
3) when the load fluctuates and results in a continuous regenerative status even during constant
speed operation of a machine such as a press
[Parameter setting]
Title Function Adjustment range Default setting
f304
Dynamic braking selection
0: Disabled
1: Enabled, Resistor overload
protection enabled
2: Enabled
3: Enabled, Resistor overload
protection enabled
(At ST terminal on)
4: Enabled (At ST terminal on)
0
f308
Dynamic braking resistance
1.0-1000 () Depending on
models
(See Section 11.4)
f309
Dynamic braking resistor
capacity
0.01-30.00 (kW)
f626
Over-voltage stall protection
level
100-150 (%)
136 (240V class)
141 (500V class)
● Overload status of braking resistor can be output by assigning the braking resistor overload pre-alarm
(function number : 30,31) to any logic output terminal.
Note 1) The operation level of dynamic braking is defined by parameter f626.
Note 2) In case of parameter f304=1 to 4, the inverter will be automatically set as “without overvoltage
limit operation” and controlled so that the resistor consumes the regenerative energy from the motor.
(The same function as f305=1)
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