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EMC and leakage currents
3
PRECAUTIONS FOR USE OF THE INVERTER
Data line filter
Data line filter is effective as an EMC measure. Provide a data line filter for the detector cable, etc.
EMC measures
Propagation Path Measures
1) 2) 3)
When devices that handle low-level signals and are liable to malfunction due to electromagnetic noises,
e.g. instruments, receivers and sensors, are contained in the enclosure that contains the inverter or when
their signal cables are run near the inverter, the devices may malfunction due to air-propagated
electromagnetic noises. The following measures must be taken:
(1) Install easily affected devices as far away as possible from the inverter.
(2) Run easily affected signal cables as far away as possible from the inverter and its I/O cables.
(3) Do not run the signal cables and power cables (inverter I/O cables) in parallel with each other and do
not bundle them.
(4) Set the EMC filter ON/OFF connector of the inverter to the ON position. (Refer to page 13)
(5) Insert common mode filters into I/O and capacitors between the input lines to suppress cable-
radiated noises.
(6) Use shield cables as signal cables and power cables and run them in individual metal conduits to
produce further effects.
4) 5) 6)
When the signal cables are run in parallel with or bundled with the power cables, magnetic and static
induction noises may be propagated to the signal cables which causes the devices to malfunction and the
following measures must be taken:
(1) Install easily affected devices as far away as possible from the inverter.
(2) Run easily affected signal cables as far away as possible from the I/O cables of the inverter.
(3) Do not run the signal cables and power cables (inverter I/O cables) in parallel with each other and do
not bundle them.
(4) Use shield cables as signal cables and power cables and run them in individual metal conduits to
produce further effects.
7)
When the power supplies of the peripheral devices are connected to the power supply of the inverter in
the same line, inverter-generated noises may flow back through the power supply cables to malfunction
the devices and the following measures must be taken:
(1) Set the EMC filter ON/OFF connector of the inverter to the ON position. (Refer to page 13)
(2) Install the common mode filter (FR-BLF, FR-BSF01) to the power cables (output cable) of the inverter.
8)
When a closed loop circuit is formed by connecting the peripheral device wiring to the inverter, leakage
currents may flow through the earth cable of the inverter to malfunction the device. In such a case,
disconnection of the earth cable of the device may cause the device to operate properly.
REMARKS
For compliance with the EU EMC directive, refer to the Installation Guideline.
Sensor
Use a shielded twisted pair cable
Inverter
power
supply
Control
power
supply
Enclosure
Decrease carrier
frequency
Motor
IM
FR-
BLF
Install a line noise filter (FR-BLF, FR-BSF01)
on the inverter output side
Power
supply
for sensor
EMC filter
Inverter
Do not earth (ground) shield
but connect it to signal common cable.
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.
Separate the inverter and
power line by more than
30cm (at least 10cm) from
sensor circuit.
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