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EMC and leakage currents
Propagation Path
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:
Install easily affected devices as far away as possible from the inverter.
(1)(2)(3)
Run easily affected signal cables as far away as possible from the inverter and its I/O cables.
Do not run the signal cables and power cables (inverter I/O cables) in parallel with each other and do not bundle them.
Install Filterpack to the inverter, or install common mode filters to the I/O side and radio noise filters to the input
side. These measures to suppress radiated noise from cables.
Use shield cables as signal cables and power cables and run them in individual metal conduits to produce further effects.
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:
(4)(5)(6)
Install easily affected devices as far away as possible from the inverter.
Run easily affected signal cables as far away as possible from the I/O cables of the inverter.
Do not run the signal cables and power cables (inverter I/O cables) in parallel with each other and do not bundle them.
Use shield cables as signal cables and power cables and run them in individual metal conduits to produce further effects.
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
(7)
following measures must be taken:
Install the line noise filter (FR-BLF, FR-BSF01) to the power cables (output cable) of the inverter.
When a closed loop circuit is formed by connecting the peripheral device wiring to the inverter, leakage currents may
(8)
flow through the earth (ground) cable of the inverter to malfunction the device. In such a case, disconnection of the
earth (ground) cable of the device may cause the device to operate properly.
Data line filter
Data line filter is effective as an EMC measure. Provide a data line filter for the detector cable, etc.
EMC measures
Inverter
power
supply
Separate inverter 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.
REMARKS
Install common mode filters (FR-BLF, FR-BSF01) and radio noise filters (FR-BIF) to the input side of the inverter as an EMC
measure for the inverter without Filterpack.
For compliance with the EU, EMC Directive, refer to the Instruction Manual (Basic).
46
Measures
Decrease
carrier frequency
Enclosure
FR-
Filterpack
Inverter
BSF01
Use a shielded twisted pair cable
Power
supply
for sensor
Do not earth (ground) shield but
connect it to signal common cable.
Install line noise filter
FR- BSF01
on inverter output side.
Motor
M
Use 4-core cable for motor
power cable and use one
cable as earth (ground) cable.
Sensor
FR- BLF
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