Lenze EVF9333−xV - Manual (Page 224)

Commissioning
Switching frequency of the inverter
6
6.9
l
6.9−2 EDSVF9333V EN 6.2−04/2012
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0018 fchop 6 Switching frequency of the
inverter
l General rule: the lower the
switching frequency the
– lower the power loss
– higher the noise generation
– better the concentricity
factor
– Observe derating
information at high
switching frequencies
l The max. output frequency
(f
out
) amounts to:
– f
chop
= 16 kHz
Þf
out
= 600 Hz
– f
chop
= 8 kHz Þf
out
= 300 Hz
– f
chop
= 4 kHz Þf
out
= 150 Hz
– f
chop
= 2 kHz Þf
out
= 150 Hz
^
6.9−1
0 auto chop automatic
change−over of the
switching
frequency
between
16/8/2 kHz
1 2 kHz sin optimised smooth
running
2 4 kHz f_top power−optimised
3 8 kHz f_top power−optimised
4 8 kHz sin 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
s
OH switch 1 0 Switch off Switch−over is not
active Temperature−dependent
switching frequency reduction
l If the heatsink temperature set
in C0122 is reached (warning
OH4), the controller switches
to 2 kHz
1 Switch on Switch−over is
active
C0144 = 0 (no temperature−dependent switching frequency reduction)
If the maximum permissible heatsink temperature ( J
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