Lenze 9300 - Controller Protection by Current Derating

During operation
6-4
L
EDSVS9332P-C EN 3.0
6.2.2 Controller protection by current derating
Valid for the types 9326 to 9332.
For rotating-field frequencies < 5 Hz the controller automatically derates the maximum permissible
output current.
• For operation with switching frequency = 8 kHz (C0018=1, power-optimised):
– The current is derating depends on the heatsink temperature (see Fig. 6-2).
• For operation with switching frequency = 16 kHz (C0018=2, noise-optimised):
– The current is always derated to I
r16
=I
016
.
• For operation with automatic changeover of the switching frequency (C0018=0):
– Below the threshold, the controller operates with 16 kHz (noise-optimised). The function of
the current derating follows the characteristic ”Imax 16 kHz” (see Fig. 6-2).
– If a higher torque is required from the machine for example for acceleration, the controller
automatically switches to 8 kHz (power-optimised). The function of the current derating
follows the characteristic ”Imax 8 kHz” (see Fig. 6-2).
K35.0129
| f
d
| [ H z ]
0 5
J
K
> 8 0 ° C
J
K
= 6 0 ° C
J
K
< 4 0 ° C
I
0 x
1 . 5 *
I
0 8
1 . 2 5 *
I
0 8
I
0 8
I
0 1 6
I
M o t o r
1 . 5 * I
r 8
= I
m a x
a t 8 k H z
I
r 1 6
= c h a n g e o v e r t o 8 k H z
a t C 0 0 1 8 = 0
1 . 5 * I
r 8
= I
m a x
a t 1 6 k H z
Fig. 6-2 Current derating function of the controllers 9326 to 9332.
ϑ
K
Heatsink temperature
I
rx
Rated current at U, V, W depending on the switching frequency
f
d
Rotating-field frequency at output U, V, W
I
0x
Max. standstill current for rotating-field frequency = 0 Hz
See chapter “Rated data” (E 3-3).
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