2 Engineering
2.2 Electrical power network
32 DC1 variable frequency drive 12/13 MN04020003Z-EN www.eaton.com
2.2.7 Sine filter
Sine filters are connected in the output of a variable frequency drive.
Figure 13: Circuit Diagram of a sine filter
The sine filter removes high-frequency components above the set resonance
frequency from the variable frequency drive output voltage (U
2
).
This reduces the conducted and radiated emission.
Advantages of sine filters:
• Long motor cable lengths with reduced conducted and radiated interfer-
ence
• Reduced motor losses and noise
• Longer motor lifespan
Disadvantages of sine filters:
• Voltage drop of up to 9% caused by system
(approx. 36 V if U
2
= 400 V)
• higher heat dissipation,
• A fixed pulse frequency is required
• Require more space inside the control panel
NOTICE
sine filters must only be used with permanently set pulse
frequencies.
￫
For more information on sine filters, please refer to
Section 11.18, „Sine filter“, page 219.
U
2
U ∼
1U2
1V2
1W2
PE
1U1
1V1
1W1
PE
M
3 ~
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