Note
Dual-frequency Braking (DFB)
Braking capacity is accomplished by means of DFB.
This feature injects a counter-rotating flux vector at well beyond the slip of the machine. This
creates a braking function and generates additional losses in the motor.
You may adjust the injection frequency via a menu setting to avoid critical frequencies, i.e.
mechanical resonances.
DFB is for braking only. Do not use DFB as a replacement for a four quadrant drive. Maximum
losses in the motor provide a deceleration torque that is much lower than the regenerative
torque provided by a regenerative drive.
Note
Restrictions for dual frequency operation
When AFE or six step regeneration are enabled, DFB is disabled.
Table 6-60
Control Loop Test Menu (3460) Parameters
Parameter
ID
Unit
Default
Min
Max
Description
Test type
3470
Speed
Select the type of loop test desired:
• Speed
• Torque
Test positive
3480
%
30.0
-200.0
200.0
Positive going limit of the test waveform.
Test negative
3490
%
-30.0
-200.0
200.0
Negative going limit of the test waveform.
Test time
3500
sec
30.1
0.0
500.0
Set the time for the drive to spend in either the
positive or negative test setting.
Begin test
3510
Function
Start the speed or torque loop test.
Stop test
3520
Function
Stop the speed or torque loop test.
Parameter Assignment/Addressing
6.10 Options for Stability Menu (3) - third half
Control Manual
136
Operating Manual, A5E50491925A
Содержание SINAMICS PERFECT HARMONY GH180
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