Lenze 9400 - Manual (Page 107)

Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
107
4 Drive interface
4.6 Device output power
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4.6 Device output power
The parameters described in the following subchapters influence the output power of the
controller.
4.6.1 Switching frequency
The controller uses a pulse-width modulation to generate its output voltage. The switching
frequency is used to change the control factor of the pulse-width modulation.
Automatic switching frequency reduction
In the Lenze setting, the "variable" switching frequency "8 kHz" has been selected in
C00018 , which
means that the controller automatically reduces the switching frequency depending on the
setpoint current.
• Depending on the current amount, it is changed down to an assigned switching frequency.
• The switching thresholds are device-dependent (see 9400 hardware manual, chapter "Rated
data").
• If a fixed switching frequency is selected in C00018 instead of a variable one, there is no
switching frequency changeover, however, (due to the field frequency range 0...5 Hz) it can only
be traversed at a low continuous current and low maximum currents (see 9400 hardware
manual, chapter "Rated data").

Tip!
If a load profile and a fixed setting of the switching frequency (e. g. 8 kHz fixed) are given,
an I x t disconnection due to a high device utilisation can be avoided by selecting the
variable setting for the same switching frequency instead.  Monitoring of the device
utilisation

Note!
If parameterisation is carried out offline or if the memory module is exchanged between
different 9400 HighLine device types, always check the setting of the switching
frequency in C00018 and adapt it, if required, to prevent a parameter error after the
parameter set download or module change!
The maximum output frequency of the controller is limited to 1/8 of the switching
frequency selected in C00018 ! (See the following table.)
Switching frequency ( C00018 ): 1 kHz 2 kHz 4 kHz 8 kHz 16 kHz
Maximum output frequency: 125 Hz 250 Hz 500 Hz 1000 Hz 1999 Hz
Motor - number of pole pairs: Maximum speed [rpm]
1 7500 15000 30000 60000 120000
2 3750 7500 15000 30000 60000
3 2500 5000 10000 20000 40000
4 1875 3750 7500 15000 30000
5 1500 3000 6000 12000 24000
6 1250 2500 5000 10000 20000