Correlation Between Pulse Frequency And Motor-Side Options - Siemens SINAMICS G130 Engineering Manual

Fundamental Principles and System Description
Engineering Information
Reduction in motor noise through pulse frequency wobbling
"Pulse frequency wobbling" can be activated via parameter p1810 / Bit 02 = 1 for Chassis units and cabinet units (not
possible on earlier units with CIB module and CU320 Control Unit with firmware versions < 2.6). The wobble
amplitude is set in parameter p1811. Pulse frequency wobbling uses a statistical method to vary the pulse frequency
according to the setting in parameter p1811. The mean pulse frequency value still corresponds to the set value, but
the statistical variation of the momentary value produces a modified noise spectrum. The subjectively perceptible
motor noise diminishes as a result, especially at the relatively low factory-set pulse frequencies. For further details
about parameter assignments, please refer to the function manual "SINAMICS S120 Drive Functions" and the list
manuals.
Note:
§ Pulse frequency wobbling can be activated only on power units in Chassis format.
§ Pulse frequency wobbling is possible only in the vector and V/f control modes, but not in servo control mode.
§ The maximum pulse frequency f
i.e.:
f = 4 kHz with current controller clock cycle of 250 μs and f
Pulse max
clock cycle of 400 μs.
§ Pulse frequency wobbling is not possible with current controller clock cycles of < 250 μs
1.1.3.6

Correlation between pulse frequency and motor-side options

If motor reactors, dv/dt filters plus VPL, dv/dt filters compact plus VPL or sine-wave filters are installed at the
converter output, the maximum permissible pulse frequency and the maximum output frequency are limited by these
options. In some cases, a fixed pulse frequency is specified:
·
Permissible pulse frequency with motor reactor (SINAMICS):
The maximum pulse frequency is limited to twice the value of the factory setting, i.e. to 4 kHz on units with
factory setting 2 kHz and to 2.5 kHz on units with factory setting 1.25 kHz. The maximum output frequency is
limited to 150 Hz independent of the selected pulse frequency.
·
Permissible pulse frequency with dv/dt filter plus VPL and dv/dt filter compact plus VPL (SINAMICS)
The maximum pulse frequency is limited to twice the value of the factory setting, i.e. to 4 kHz on units with
factory setting 2 kHz and to 2.5 kHz on units with factory setting 1.25 kHz. The maximum output frequency is
limited to 150 Hz independent of the selected pulse frequency.
·
Permissible pulse frequency with sine-wave filter (SINAMICS):
Sine-wave filters are available for voltage levels 380 V to 480 V 3AC and 500 V to 600 V 3AC. The pulse
frequency is a mandatory fixed value and equals 4 kHz (380 V to 480 V) or 2.5 kHz (500 V to 600 V). The
maximum output frequency is limited to 150 Hz (380 V – 480 V) or 115 Hz (500 V – 600 V).
·
Permissible pulse frequency with sine-wave filter (external supplier):
The pulse frequency and maximum output frequency must be set according to the filter manufacturer's
instructions.
SINAMICS Engineering Manual – November 2015
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Ó Siemens AG
with wobbling equals f
Pulse max
= 1/current controller clock cycle,
Pulse max
= 2.5 kHz with current controller
Pulse max