2 Engineering
2.8 Sine filter
DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com 53
2.8 Sine filter
The DX-SIN3… sine filter removes high-frequency components from the
variable frequency drive’s output voltage (U
2
) reducing conducted and
emitted interference as a result. The sine filter’s output voltage will have a
sinusoidal shape with a small superimposed ripple voltage.
The sinusoidal voltage’s total harmonic distortion is typically 5 to 10 %.
This will reduce noise and losses in the motor.
Figure 29:Maximum permissible motor cable lengths
a Screened motor cable: U
2
≦ 230 V → l ≦ 200 m; U
2
≦ 500 V → l ≦ 150 m
Unscreened motor cable: U
2
≦ 230 V → l ≦ 300 m; U
2
≦ 500 V → l ≦ 200 m
￫
Sine filter DX-SIN3… should only be operated with fixed
switching frequencies.
Accordingly, the carrier frequency (P2-24) must be set to the
value set in parameter P6-02 (auto temperature management)
(P2-24 = P6-02).
Permissible carrier frequencies for DA1 with DX-SIN3…:
1 8 kHz; 2 12 kHz
As a result of double modulation, the value set on the DA1
variable frequency drive will be twice the effective value on the
sine filter (1 8kHz
4 kHz; 2 12 kHz 6 kHz).
￫
For the rated sine filters for DA1 variable frequency drives,
please refer to the technical data chapter in
Section 6.11, „Sine filter“, page 190.
M
3 ~
DX-SIN3...
f
PWM
f
2
U
2
l
e
u
k
l
①
L
Motor
Mains
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