F07423 — Drive: APC filter natural frequency > Shannon frequency

F07423 is raised when one of the APC filter natural frequencies is greater than the Shannon frequency. The drive calculates the Shannon frequency from the sampling time for supplementary functions p0115[1] and the sub-sampling factor x of the filter group concerned: 0.5 / (p0115[1] * x), where x = 1 for filter 1.1, x = p3706 for the filters 2.x and x = p3707 for the filters 3.x. The fault value in r0949, interpreted in binary, shows which filter is involved and the number of the data set concerned.

• One of the configured APC filter natural frequencies is greater than the Shannon frequency 0.5 / (p0115[1] * x).

1. Read the fault value r0949 in binary: a set bit marks the filter involved (bit 0 = filter 1.1, bit 4 = filter 2.1, bit 5 = filter 2.2, bit 8 = filter 3.1, bit 9 = filter 3.2); bits 16 ... 32 contain the data set number, starting from zero.
2. Reduce the numerator or denominator natural frequency of the filter involved so that it lies below the Shannon frequency.
3. Alternatively reduce the speed controller sampling time (p0115[1]) or the sub-sampling (p3706, p3707); because both enter the formula 0.5 / (p0115[1] * x), this raises the Shannon frequency.
4. Or switch out the filter involved (p3704).

• The drive enters the fault value in r0949; interpret it in binary.
• Bit 0: Filter 1.1 (p3711, p3713), x = 1
• Bit 4: Filter 2.1 (p3721, p3723), x = p3706
• Bit 5: Filter 2.2 (p3726, p3728), x = p3706
• Bit 8: Filter 3.1 (p3731, p3733), x = p3707
• Bit 9: Filter 3.2 (p3736, p3738), x = p3707
• Bit 16 ... 32: Data set number (starting from zero)

• p0115[1] — sampling time for supplementary functions; it stands in the denominator of the Shannon frequency, so reducing it raises 0.5 / (p0115[1] * x).
• r0949 — fault value; read it in binary to identify the affected filter and the data set number.
• p3711 — APC filter 1.1 denominator natural frequency; reduce it when bit 0 is set.
• p3713 — APC filter 1.1 numerator natural frequency; reduce it when bit 0 is set.
• p3706 — APC sub-sampling filter 2.x; the factor x for the filters 2.x in the Shannon formula.
• p3721 — APC filter 2.1 denominator natural frequency; reduce it when bit 4 is set.
• p3723 — APC filter 2.1 numerator natural frequency; reduce it when bit 4 is set.
• p3726 — APC filter 2.2 denominator natural frequency; reduce it when bit 5 is set.
• p3728 — APC filter 2.2 numerator natural frequency; reduce it when bit 5 is set.
• p3707 — APC sub-sampling filter 3.x; the factor x for the filters 3.x in the Shannon formula.
• p3731 — APC filter 3.1 denominator natural frequency; reduce it when bit 8 is set.
• p3733 — APC filter 3.1 numerator natural frequency; reduce it when bit 8 is set.
• p3736 — APC filter 3.2 denominator natural frequency; reduce it when bit 9 is set.
• p3738 — APC filter 3.2 numerator natural frequency; reduce it when bit 9 is set.
• p3704 — APC filter activation; use it to switch out the filter involved.

The fault can be acknowledged immediately with POWER ON, i.e. by switching the drive power supply off and on again. No automatic stop reaction is executed (OFF1, OFF2 and OFF3 remain selectable). Because the cause lies in the parameterization, correct the filter settings as described above before re-acknowledging — otherwise the drive raises F07423 again.