Switching Frequencies - Lenze i550 Series Project Planning Manual

M Torque
n Speed
Application areas are for instance:
Single drives with changing loads
•
Single drives with high starting duty
•
Sensorless speed control of three-phase AC motors
•

Switching frequencies

On an inverter, the term "switching frequency" is understood to mean the frequency with
which the input and outputs of the output module (inverter) are switched. On an inverter, the
switching frequency can generally be set to values between 2 and 16 kHz, whereby the selec-
tion is based on the respective power output
As switching the modules cause heat losses, the inverter can provide higher output currents at
low switching frequencies than at high frequencies. Additionally, it is distinguished between
the operation at a permanently set switching frequency and a variably set switching fre-
quency. Here, the switching frequency is automatically reduced as a function of the device
utilisation.
At a higher switching frequency, the noise generation is less.
Features
Switching frequencies
M
Vector
U/f
M
N
M
n
Versions
• 2 kHz
• 4 kHz
• 8 kHz
• 16 kHz
• variable (automatic adjustment)
n n
N
Rated torque
rated
Rated speed
rated
Appendix
Good to know
Switching frequencies
261