6 Function & parameter description
Group 3 – Motor control
Lenze · Inverter i510 / i550 - Cabinet · Operation Manual · 0.4 EN · 02/2016 61
6.5.7 Rotation restriction
The rotation of the motor can be restricted to forward only.
See chapter “6.2.4 Rotation direction”, page 42
0: Forward only
1: Forward and reverse
The inverter can be limited to Forward (FWD) rotation only. This affects
the final output setpoint for velocity and PID setpoint
Note:
This command only prevents negative velocity setpoints. Therefore it is
still possible that the motor runs reverse (Example: Wrong wiring).
6.5.8 Switching frequency
The inverter output is DC voltage that is sine-coded pulse width modulated (PWM) to approximate variable fre-
quency AC voltage. The frequency of the PWM pulses is adjustable. This adjustment is called the PWM switching
frequency.
General:
Higher switching frequencies will result in less audible noise but will cause the inverter to generate more
heat and operate less efficiently.
Lower switching frequencies will result in more audible noise but will cause decreased earth leakage current,
increased inverter efficiency and increased ambient operating temperature range.
1: 4kHz var. / optimized
2: 8kHz var. / optimized
3: 16kHz var. / optimized
5: 2kHz fix / optimized
6: 4kHz fix / optimized
7: 8kHz fix / optimized
8: 16kHz fix / optimized
11: 4kHz var. / min. Pv
12: 8kHz var. / min. Pv
13: 16kHz var. / min. Pv
15: 2kHz fix / min. Pv
16: 4kHz fix / min. Pv
17: 8kHz fix / min. Pv
18: 16kHz fix / min. Pv
21: 8kHz var./ opt./4kHz min.
22: 16kHz var./opt./4kHz min.
23: 16kHz var./opt./8kHz min
31: 8kHz var./ Pv/4kHz min.
32: 16kHz var./ Pv/4kHz min.
33: 16kHz var./ Pv/8kHz min.
Definition of the Switching Frequency
1, 2, 3:
Optimized for best inverter performance (symmetrical modulation)
Variable switching frequency: Inverter reduces the switching frequency if
output current or inverter temperature are too high. Minimal Switching
Frequency is limited to 2 kHz.
5, 6, 7, 8:
Optimized for best inverter performance (symmetrical modulation)
Switching frequency is fixed.
11, 12, 13:
Optimized for best inverter efficiency (asymmetrical modulation).
Variable switching frequency: Inverter reduces the switching frequency if
output current or inverter temperature are too high. Minimal Switching
Frequency is limited to 2 kHz.
15, 16, 17, 18:
Optimized for best inverter efficiency (asymmetrical modulation).
Switching frequency is fixed.
21, 22, 23:
Optimized for best inverter performance (symmetrical modulation)
Variable switching frequency: Inverter reduces the switching frequency if
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