Commissioning
Switching frequency of the inverter
6
6.9
6.9-2
EDSVF9333V EN 3.0-06/2005
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0018 fchop 6 Switching frequency of the
inverter
z General rule: the lower the
switching frequency the
– lower the power loss
– higher the noise generation
– better the concentricity
factor
–Observederating
information at high
switching frequencies
z The max. output frequency
(f
out
) amounts to:
–f
chop
=16kHz⇒f
out
= 600 Hz
–f
chop
=8kHz⇒f
out
= 300 Hz
–f
chop
=4kHz⇒f
out
= 150 Hz
–f
chop
=2kHz⇒f
out
= 150 Hz
6.9-1
0 auto chop automatic
change-over of
the switching
frequency
between
16/8/2 kHz
1 2kHzsin optimised smooth
running
2 4kHzf_top power-optimised
3 8kHzf_top power-optimised
4 8kHzsin noise optimised
5 16 kHz sin noise optimised
6 auto 8/2 kHz noise /
power-optimised
with automatic
change-over to
low switching
frequency
C0144
OH switch 1
0 Switch off Switch-over is not
active
Temperature-dependent
switching frequency reduction
z If the heatsink temperature set
in C0122 is reached (warning
OH4), the controller switches to
2kHz
1 Switch on Switch-over is
active
C0144 = 0 (no temperature-dependent switching frequency reduction)
If the maximum permissible heatsink temperature (ϑ
max
) is exceeded when
operating with automatic switching frequency reduction, the inverter is
inhibited, TRIP ”OH” (overtemperature) is set and the motor coasts without
torque.
C0144 = 1 (temperature-dependent switching frequency reduction is
active):
ƒ If the heatsink temperature set in C0122 (overtemperature OH4) is
reached when operating with automatic switching frequency
reduction, the controller automatically reduces the switching
frequency to 2 kHz, thus keeping the operation running.
ƒ After the heatsink has cooled down, the controller automatically
switches to the set switching frequency again.
Function of automatic
switching frequency
reduction
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