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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

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 953 954

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