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6-37 6. [Advanced] How to use parameters
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■ DC braking with the set frequency
When the inverter decelerates until the setting value of <F250: DC braking frequency>, it applies DC
braking.
Set the DC braking amount with <F251: DC braking current>. Set the amount based on 100%
meaning the rated current of the inverter. With <F701: Current, voltage units select> set to "1: A
(ampere), V (volt)", specify a current value (A).
■ DC braking with an external signal
A signal input to the terminal can forcibly cause the inverter to apply DC braking.
Assign "22: DC braking" ("23" for inversion) to the input terminal.
DC braking is applied while the terminal is turned ON regardless of the settings of <F250: DC
braking frequency> and <F252: DC braking time>.
Even when the terminal is turned OFF, it is applied for the period set with <F252: DC braking time>.
The DC braking amount depends on the setting of <F251: DC braking current>.
Important
• The inverter has high sensitivity for overload protection when DC braking is in progress. It may
automatically adjust the DC braking amount to prevent a trip.
Memo
• The carrier frequency when DC braking is in progress is the setting value of either <F249: DC
braking carrier frequency> or <F300: Carrier frequency> which is lower.
Reference
• How to operate the operation panel -> Refer to [3. 1. 1].
• How to switch display mode on the operation panel -> Refer to [3. 1. 2].
• Procedure to change parameter setting -> Refer to [4. 2. 3]
• Details on operation by external signals -> Refer to [Chapter 7].
ON
OFF
0
0
Output frequency (Hz)
Output current (A)
Run signal between [F]-[CC]
Setting frequency
<F250: DC braking frequency>
DC braking stop
<F251: DC braking current>
<F252: DC braking time> Note)
Note) Actually it will be longer than the setting value of <F252> because of the reduced voltage operation.
Time (s)
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