Note
Dual-frequency Braking (DFB)
Braking capacity is accomplished by means of DFB.
This feature injects a counter-rotating ux 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
NXGPro+ Control Manual
136 Operating Manual, A5E50491925A
To Next Page
Loading...
