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• Use shielded twisted pair cables for the detector connecting and control signal cables and connect the sheathes of the
shielded cables to terminal SD.
• Ground (Earth) the inverter, motor, etc. at one point.
 EMS measures to reduce electromagnetic noises that enter the inverter
and cause it to malfunction
When devices that generate many electromagnetic noises (which use magnetic contactors, electromagnetic brakes, many
relays, for example) are installed near the inverter and the inverter may malfunction due to electromagnetic noises, the
following countermeasures must be taken:
• Provide surge suppressors for devices that generate many electromagnetic noises to suppress electromagnetic noises.
• Install data line filters to signal cables (refer to
• Ground (Earth) the shields of the detector connection and control signal cables with cable clamp metal.
 EMI measures to reduce electromagnetic noises that are radiated by the
inverter to cause the peripheral devices to malfunction
Inverter-generated noises are largely classified into those radiated by the inverter itself and by the I/O cables connected to its
main circuit, those electromagnetically and electrostatically induced to the signal cables of the peripheral devices close to the
power cable connected to the inverter main circuit, and those transmitted through the power cables.
Inverter generated
Air propagated
electromagnetic
noise
noise
Electromagnetic
induction noise
Electrostatic
induction noise
Electrical path
propagated noise
Noise 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 by air-propagated electromagnetic noises. The
following countermeasures must be taken:
• Install easily affected devices as far away as possible from the inverter.
• Run easily affected signal cables as far away as possible from the inverter and its I/O cables.
(a), (b), (c)
• Do not run the signal cables and power cables (inverter I/O cables) in parallel with each other and do not bundle
them.
• Set the EMC filter ON/OFF connector of the inverter to the ON position. (Refer to
• Inserting a line noise filter into the output suppresses the radiated noise from the cables.
• Use shielded 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 to cause malfunction of the devices and the following countermeasures must
be taken:
• Install easily affected devices as far away as possible from the inverter.
(d), (e), (f)
• 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.
• Use shielded cables as signal cables and power cables and run them in individual metal conduits to produce further
effects.
page
88).
Noise directly
Path (a)
radiated from inverter
Noise radiated from
Path (b)
power supply cable
Noise radiated from
Path (c)
motor connection cable
Path (d), (e)
Path (f)
Noise propagated through
Path (g)
power supply cable
Noise from earthing
Path (h)
(grounding) cable due to
leakage current
Countermeasure
(e)
(g)
(b)
(a)
(c)
Instrument
Receiver
Motor
3. PRECAUTIONS FOR USE OF THE INVERTER
3.1 Electro-magnetic interference (EMI) and leakage currents
Telephone
(g)
Sensor
power supply
Inverter
(f)
(a)
(f)
(d)
(c)
Sensor
M
page
88.)
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