Lenze 8200 motec frequency inverter 0.25kW-7.5kW - Manual (Page 86)

Function library
Selection of control mode, optimisation of operating behaviour
7−15
L
EDB82MV752 EN 5.2
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0018
v
Switching
frequency 2 0 2 kHz sin General rule:
The lower the switching frequency the
·
lower the power loss
·
higher the noise generation
Only operate mid−frequency motors at 8
kHz sin or 16 kHz sin (C0018 = 2 or 3)!
^ 7−14
1 4 kHz sin
2 8 kHz sin
low noise generation
3 16 kHz sin
C0018
v
Switching
frequency
(only 8200 vector
15 ... 90 kW) 6 0 2 kHz sin General rule:
The lower the switching frequency the
·
lower the power loss
·
higher the noise generation
Only operate mid−frequency motors at 8
kHz sin or 16 kHz sin (C0018 = 2 or 3)!
^ 7−14
1 4 kHz sin
2 8 kHz sin
low noise generation
3 16 kHz sin
4 2 kHz
low power loss
5 4 kHz
6 8 kHz
7 16 kHz
8 1 kHz sin
9 ... 11 Reserved
12 1 kHz low power loss
C0144
v
No temperature
depending
switching frequency
derating 1 0 No temperature−depending switching frequency
derating When operating with a switching frequency
of 16 kHz it is also possible to derate it to 4
kHz. The behaviour can be changed under
C0310.
^ 7−14
1 Automatic switching frequency derating to 4 kHz,
if
J
max reaches
− 5 °C
Automatic switching frequency reduction
C0144 = 0 (no temperature−dependent switching frequency reduction)
If the maximum heatsink temperature (
J
max
is exceeded when using a switching frequency of 8 kHz
or 16 kHz) the inverter will be inhibited, TRIP "OH" (overtemperature) will be set and the motor will
coast to standstill.
C0144 = 1 (temperature−dependent switching frequency reduction is active):
·
If the heatsink temperature
J
max
− 5 °C is reached when using a switching frequency of 8 kHz
or 16 kHz the controller automatically reduces the switching frequency to 4 kHz thus keeping
the operation running.
·
After cooling the heatsink the controller automatically changes to the switching frequency set.
)
Note!
The switching frequency is automatically set to its optimum value depending on the
apparent motor current and output frequency to ensure trouble−free operation.
l The noise emission changes.
l The user cannot influence this function.
Tip
Medium−frequency motors are only allowed to be operated on 8 kHz sin or 16 kHz sin.