Mitsubishi Electric 800 Series Instruction Manual page 76

 EMI countermeasure example
Install filter on inverter
input side.
Inverter
power
supply
Separate inverter and
power line by more than
30 cm (at least 10 cm)
from sensor circuit.
Control
power
supply
Do not earth (ground)
enclosure directly.
Do not earth (ground) control cable.
Decrease carrier frequency.
Line Line
noise Inverter noise
filter filter
Use 4-core cable for motor
power cable and use one cable
as earth (ground) cable.
Use a twisted pair shielded cable.
Power
supply for
sensor
Do not earth (ground) shield but
connect it to signal common cable.
Install filter on
inverter output side.
M
Motor
Sensor
3. PRECAUTIONS FOR USE OF THE INVERTER
3.1 Electro-magnetic interference (EMI) and leakage currents
3
4
3
4
5
6
7
8
9
10
75