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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 46

Transistorized inverter, high function & low acoustic noise.
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• Data line filter
Noise entry can be prevented by providing a data line filter for the detector cable etc.
Example Data line filter:
ESD-SR-25 (Tokin make)
Impedance specifications (ZCAT3035-1330)
Impedance (Ω)
10 to 100MHz
100 to 500MHz
80
150
The above impedance values are reference values
and not guaranteed values.
• Data examples
By decreasing the carrier frequency, the noise terminal voltage*
can be reduced. Use Pr. 72 to set the carrier frequency to a low
value (1kHz).
Though motor noise increases at a low carrier frequency,
selection of Soft-PWM in Pr. 240 will make it unoffending.
By decreasing the carrier frequency, noise will be about as low
as that of our conventional FR-Z200 series.
Noise Terminal Voltage of Inverter and Example
of Its Reduction by Noise ilters
Conditions
Motor:3.7kW (5HP)
Average terminal voltage 0dB=1µV
120
FR-Z220-3.7K
100
80
60
FR-A520-3.7k(fc=0.7kHz)
20
0
0.1
0.3 0.5
1
Noise frequency (MHz)
*Noise terminal voltage: Represents the magnitude of noise propagated from the inverter to the power supply.
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ZCAT3035-1330 (TDK make)
39±1
34±1
TDK
Product name
Lot number
Outline Dimension Drawing (ZCAT3035-1330)
Differences between Noise Terminal Voltages
at Different Carrier Frequencies
Conditions
Motor: 3.7kW (5HP)
Average terminal voltage 0dB=1µV
120
FR-A220E-3.7k fc=(14.5kHz)
FR-A520-3.7K
100
80
fc=0.7kHz
fc=14.5kHz
60
fc=2.0kHz Soft-PWM(Factory setting)
20
0
0.1
0.3
0.5
1
3
5
Noise frequency (MHz)
By using shielded cables as signal cables, induction noise can
be reduced greatly (to 1/10 - 1/100). Induction noise can also be
reduced by moving the signal cables away from the inverter
output cables. (Separation of 30cm (11.81 inches) reduces noise
to 1/2-1/3.)
By fitting the FR-BSF01 or BLF on the inverter output side,
induction noise to the signal cables can be reduced.
Noise Induced to Signal Cables by Inverter Output Cables
100
120dB=1V
80
60
40
20
0
3
5
10
30
35
INSTALLATION AND WIRING
Cable fixing band
mounting section
120dB=1V
10
30
Conditions
Inverter: FR-A520-3.7K
Motor: FR-JR 4P 3.7kW (5HP)
Output frequency: 30Hz
Parallel cable
Noise form: Normal mode
Twisted pair cable
Inverter
Coaxial cable
FR-BLF
FR-BSF01
(4T)
Measuring instrument
Line-to-line distance, d (cm)
10
20
30
40
50
[Unit : mm]
5cm
d(cm)
Motor
Terminal

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