2 Engineering
2.9 Sine filter
DC1…20… and DC1…OE1 Variable Frequency Drives 02/20 MN040059EN www.eaton.com 49
2.9 Sine filter
Sine filters are connected between a variable frequency drive’s output and
the motor. The voltage output by a sine filter will be virtually sinusoidal,
ensuring that:
• Conducted and radiated emissions will be reduced (EMC),
• Irritating noise levels and motor losses will be reduced,
• Potential insulation damage will be minimized, extending the motor’s life
as a result.
￫
Sine filters require for the variable frequency drive to modulate
the output voltage with V/Hz control.
In order to meet this requirement, parameter P-60 on DC1-…E1
variable frequency drives needs to be set to a value of 1 (this is
the default setting).
￫
When there is a load-dependent or thermal overload, DC1
variable frequency drives will automatically reduce the carrier
frequency (f
PWM
) to a minimum value of 8 kHz (double
modulation, effective rms value of 4 kHz).
￫
When used with a DX-SIN3… sine filter, the minimum
permissible carrier frequency (f
PWM
) on the DC1 variable
frequency drive must be set to 8 kHz using parameter P-17.
￫
For the rated sine filters DX-SIN3… for DC1 variable frequency
drives, please refer to the technical data chapter in
Section 6.11, “Sine filter“, page 179.
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