Siemens SINAMICS S120 Function Manual page 206

Basic functions
6.6 Pulse frequency wobbling
● Bit 2: Activate pulse frequency wobbling
p1811[0...n] Pulse frequency wobbling amplitude
Parameter p1811[0...n] "Pulse frequency wobbling amplitude" can be set to adjust the
magnitude of variation in the pulse frequency wobble to between 0 and 20 %. The default
setting is zero. With a wobble amplitude of p1811 = 0, the maximum possible pulse
frequency
p1800 = 2 * 1/current controller cycle (1000/p0115[0]). With a wobble amplitude setting of
p1811 > 0, the maximum possible pulse frequency p1800 = current controller cycle
(1000/p0115[0]). These conditions apply to all indices.
p1811 > 0 is possible under the following conditions:
● p1810.2 (modulator configuration) = 1 (wobbling activated)
● p1800 (pulse frequency) <= 1000/p115[0]
● p0230 (output filter) < 3 (no sine-wave filter)
Note
If pulse frequency wobbling is deactivated, all the indices of parameter p1811 are set to 0.
206
Pulse frequency wobbling is deactivated in the default setting (p1810.2 = 0). When the
sine-wave filter is active (p0230 = 3 or 4), the wobbling function is locked out in order to
protect the filter.
Pulse frequency wobbling can be activated (p1810.2 = 1) only if:
– p1800 (pulse frequency) <= 2* 1000/p0115[0] (in all indices)
– p1802 (modulator mode) <= 6 (no optimized pulse patterns)
– Motors Modules are not connected in parallel
– A pulse inhibit is applied
– r0192 bit 16 = 1 Gating unit with pulse frequency wobbling is available (as of firmware
version 2.6)
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions