Parameter
Table 6-100 Setting and enabling compound braking
Number Name Factory setting
r1282 Vdc_max controller, switch-on level (U/f) - V
p3856[D] Compound braking current (%) 0 %
r3859.0 CO/BO: Compound braking/DC quantity control status word -
6.7.5 Pulse frequency wobbling
Note
This function is only available for the converters of frame sizes FSH and FSJ.
Overview
Pulse frequency wobbling damps the spectral components, which can generate unwanted
noise in the motor. Wobbling is activated by default for the converters of frame sizes FSH and
FSJ.
Wobbling causes the pulse frequency in a modulation interval to deviate from the setpoint
frequency. This means that the actual pulse frequency might be higher than the average pulse
frequency required.
A noise generator can be used to vary the pulse frequency around an average value. In this
case, the average pulse frequency is equal to the setpoint pulse frequency. The pulse
frequency can be varied in every current controller cycle if the cycle is constant. Current
measurement errors resulting from asynchronous pulse and control intervals are compensated
by a correction in the actual current value.
Parameter p1811[0...n] can be set to adjust the magnitude of variation in the pulse frequency
wobble between 0 and 20%. The factory setting is 10%. For a wobble amplitude of p1811 = 0%,
the maximum possible pulse frequency is p1800 = 2 × 1/current controller cycle (4 kHz). With
a wobble amplitude setting of p1811 > 0, the maximum possible pulse frequency is p1800 = 1/
current controller cycle (2 kHz). These conditions apply to all indices.
Parameters
Parameter Description Factory setting
p1811 Pulse frequency wobbulation amplitude 10%
For more information about the parameters, see Chapter "Parameter list (Page 470)".
Advanced commissioning
6.7 Motor control
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC 403
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