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Electro-magnetic interference (EMI) and leakage currents
PRECAUTIONS FOR USE OF THE INVERTER
65
3
EMI countermeasure example
NOTE
• For compliance with the EU EMC Directive, refer to page 109.
Converter
unit
Line noise
filter
Install filter on inverter output side.
Inverter
Sensor
Use a twisted pair shielded cable
Enclosure Decrease carrier frequency
Motor
Inverter
power
supply
Separate inverter,
converter unit and
power line by more than
30cm (at least 10cm)
from sensor circuit.
Control
power
supply
Do not earth (ground) enclosure directly.
Do not earth (ground) control cable.
Use 4-core cable for motor
power cable and use one cable
as earth (ground) cable.
Do not earth (ground) shield but
connect it to signal common cable.
EMC
filter
M
Power
supply for
sensor