Mitsubishi Electric FR-A520-0.4K-NA Instruction Manual page 45

• 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
80
The above impedance values are reference values
and not guaranteed values.
• Data examples
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
120
100
80
60
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.
ZCAT3035-1330 (TDK make)
100 to 500MHz
150
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.
Differences between Noise Terminal Voltages
at Different Carrier Frequencies
120
FR-A520-3.7K
100
80 fc=0.7kHz
60
fc=2.0kHz Soft-PWM(Factory setting)
20
0
0.1 0.3 0.5 1
Noise frequency (MHz)
Conditions
‚
Motor:3.7kW (5HP)
‚
Average terminal voltage 0dB=1µV
120dB=1V
FR-Z220-3.7K
FR-A520-3.7k(fc=0.7kHz)
3 5 10
INSTALLATION AND WIRING
39±1
34±1
TDK
Product name Lot number
Outline Dimension Drawing (ZCAT3035-1330)
Conditions
‚
Motor: 3.7kW (5HP)
‚
Average terminal voltage 0dB=1µV
120dB=1V
FR-A220E-3.7k fc=(14.5kHz)
fc=14.5kHz
3 5 10
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
Parallel cable
80
Twisted pair cable
60
40
Coaxial cable
20
0
10 20
30
35
Cable fixing band
mounting section
30
Conditions
‚
Inverter: FR-A520-3.7K
‚
Motor: FR-JR 4P 3.7kW (5HP)
‚
Output frequency: 30Hz
‚
Noise form: Normal mode
5cm
d(cm)
Inverter
FR-BLF
FR-BSF01
(4T)
Measuring instrument
Line-to-line distance, d (cm)
30 40 50
[Unit : mm]
Motor
Terminal