Lenze EVF9383 - Manual (Page 178)

Switching frequency of the inverter 6.9
l
6.9−2 EDSVF9383V EN 7.1−04/2012
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
l Observe derating indications
for high switching frequencies
l The max. output frequency
(f
max
) is:
– fchop = 4 kHz Þ
f
max
= 300 Hz
– fchop = 2 kHz Þ
f
max
= 150 Hz
– fchop = 1 kHz Þ
f
max
= 150 Hz
^
6.9−1
1 1 kHz sin loss−optimised
2 2 kHz sin concentricity−opti
mised
3 4 kHz f_top power−optimised
4 4 kHz sin noise−optimised
6 4/2 kHz sin noise/concentricit
y−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