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6-61 6. [Advanced] How to use parameters
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6. 15. 4 Dynamic braking - Abrupt motor stop
<F304: Dynamic braking, OLr trip>
<F308: Braking resistance>
<F309: Braking resistor capacity>
<F626: Overvoltage limit operation level>
<F639: Braking resistor overload time>
â– Function
The dynamic braking function can be enabled by connecting an external braking resistor.
• When an abrupt deceleration is necessary
• When an overvoltage "OP" trip occurs at a deceleration stop
• When the continuous regenerative state, such as moving down of a lifting gear and winding-out
operation for tension control, is entered
• When the regenerative state is entered by load fluctuation during constant speed run of a press
machine, etc.
â– Parameter setting
â– How to use
To use dynamic braking, set <F304: Dynamic braking, OLr trip> to "1" - "8" (dynamic braking
enabled). At this time, the overvoltage limit operation is automatically disabled as in the case of
<F305: Overvoltage limit operation> ="1: Disabled", and the regenerative energy of the motor is
consumed by a braking resistor. (Refer to [6. 15. 5].)
Title Parameter name Adjustment range Unit Default setting
F304 Dynamic braking, OLr trip 0: Disabled
1: Enabled, OLr trip
2: Enabled, No OLr trip
3: Enabled (except during ST OFF), OLr trip
4: Enabled (except during ST OFF), No OLr
trip
5: Enabled (except during trip), OLr trip
6: Enabled (except during trip) ,No OLr trip
7: Enabled (except during trip & ST OFF),
OLr trip
8: Enabled (except during trip & ST OFF), No
OLr trip
0
F308 Braking resistance 0.5 - 1000 Ω
*1
*1 Depending on capacity, refer to [11. 6].
F309 Braking resistor capacity 0.01 - 600.0 kW
*1
F626 Overvoltage limit
operation level
100 - 150 % 134
F639 Braking resistor overload
time
0.1 - 600.0 s 5.0
0: Disabled
1: Enabled,OLr trip
2: Enabled,No OLr trip
3: Enabled (exc ST off) ,OLr
4: Enabled (exc ST off) ,No OLr
0.0HzSTOP
13:17
F304 : Dynamic braking,OLr trip
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