During operation
6-4
SHB9300CRV EN 2.0
6.2.2 Controller protection through current derating
Valid for the types 9326 to 9332.
For field frequencies < 5 Hz the controller automatically derates the maximum permissible output
current.
l
For operation with chopping frequency = 8 KHz (C0018=1, optimum power):
– The current limit is derated according to the heatsink temperature (see Fig. 6-2).
l
For operation with chopping frequency = 16 KHz (C0018=2, optimum noise):
– The current limit is always derated to I
r16
=I
016
.
l
For operation with automatic changeover of the chopping frequency (C0018=0):
– Below the threshold, the controller operates with 16 kHz (optimum noise). The function of
the current limitation follows the characteristic ”Imax 16 KHz” (see Fig. 6-2).
– If the machine requires a higher torque, for example for acceleration, the controller
automatically switches to 8 kHz (optimum power). The function of the current limitation
follows the characteristic ”Imax 8 KHz” (see Fig. 6-2).
K35.0129
|f
d
| [H z ]
05
ϑ
K
> 80 °C
ϑ
K
= 60 °C
ϑ
K
< 40 °C
I
0x
1.5 *
I
08
1.25 *
I
08
I
08
I
016
I
Motor
1.5 * I
r8
= I
max
at 8 kH z
I
r1 6
= changeover to 8 kH z
at C 0018 = 0
1.5 * I
r8
= I
max
at 16 kH z
Fig. 6-2 Current derating function for types 9326 to 9332
J
K
Heatsink temperature
I
rx
Rated current at U, V, W depends on the chopper frequency
f
d
Field frequency at the output U, V, W
I
0x
Max. standstill current at field frequency = 0 Hz
See also chapter “Rated data”.
&
3-3
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