Mitsubishi FR-E540-0.4K-EC Instruction Manual page 49

" " " " Data line filter
Noise entry can be prevented by providing a data line filter for the detector or other
cable.
" " " " Example of counter measures against noise
FR-BLF
Install filter
FR-BSF01
to inverter input side.
Inverter
power supply
Install filter FR-BIF to
inverter input side.
Separate inverter and power
line 30cm or more (at least 10cm)
from sensor circuit.
Control power
supply
Do not ground control
box directly.
Do not ground control cable.
! 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
Control box Reduce carrier frequency.
FR-
Inverter
BSF01
FR-
BIF
Power supply
for sensor
Do not ground shield but connect it to signal
common cable.
inverter to the power supply.
36
INSTALLATION AND WIRING
Install filter
inverter output side.
FR-
BSF01
Use 4-core cable for motor power
cable and use one wire as earth cable.
Use twisted pair shielded cable.
Sensor
FR-BLF
to
FR-BSF01
Motor
IM
2