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INSTALLATION AND WIRING
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Data line filter
Noise entry can be prevented by providing a data line filter for the detector or other
cable.
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Example of counter measures against noise
Inverter
FR-
BIF
Sensor
Use 4-core cable for motor power
cable and use one wire as earth cable.
Power supply
for sensor
Use twisted pair shielded cable.
Inverter
power supply
Control power
supply
Do not ground shield but connect it to signal
common cable.
Do not ground control
box directly.
Do not ground control cable.
Separate inverter and power
line 30cm or more (at least 10cm)
from sensor circuit.
Install filter FR-BIF to
inverter input side.
Control box Reduce carrier frequency.
Motor
IM
FR-
BSF01
FR-
BSF01
FR-BLF
FR-BSF01
Install filter
to inverter input side.
FR-BLF
FR-BSF01
Install filter to
inverter output side.
!
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
will make it unoffending.
!
By using shielded cables as signal cables, induction noise can be reduced greatly
(1/10 to 1/100).
* Noise terminal voltage: Represents the magnitude of noise propagated from the
inverter to the power supply.
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