Siemens SINAMICS PERFECT HARMONY GH180 Function Manual page 138

Parameter Assignment/Addressing
6.10 Options for Stability Menu (3) - third half
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
Test type 3470
Test positive 3480
Test negative 3490
Test time 3500
Begin test 3510
Stop test 3520
136
Unit Default Min
Speed
% 30.0 -200.0
% -30.0 -200.0
sec 30.1 0.0
Function
Function
Max Description
Select the type of loop test desired:
• Speed
• Torque
200.0 Positive going limit of the test waveform.
200.0 Negative going limit of the test waveform.
500.0 Set the time for the drive to spend in either the
positive or negative test setting.
Start the speed or torque loop test.
Stop the speed or torque loop test.
NXGPro+ Control Manual
Operating Manual, A5E50491925A