Mitsubishi Electric A800-GF Instruction Manual page 73

Electro-magnetic interference (EMI) and leakage currents
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 the converter unit,
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 or the converter unit.
• Run easily affected signal cables as far away as possible from the inverter or the converter unit, and its I/O
(a)(b)(c) cables.
• Do not run the signal cables and power cables (inverter or converter unit I/O cables) in parallel with each other
and do not bundle them.
• Set the EMC filter ON/OFF connector of the converter unit 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 or the converter unit.
• Run easily affected signal cables as far away as possible from the inverter or the converter unit, and its I/O
(d)(e)(f)
cables.
• Do not run the signal cables and power cables (inverter or converter unit 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.
When the power supplies of the peripheral devices are connected to the power supply of the inverter or the
converter unit in the same line, its generated noises may flow back through the power supply cables to cause
(g) malfunction of the devices and the following countermeasures must be taken:
• Set the EMC filter ON/OFF connector of the converter unit to the ON position. (Refer to
• Install the line noise filter to the power cables (output cables) of the inverter.
When a closed loop circuit is formed by connecting the peripheral device wiring to the inverter or the converter unit,
leakage currents may flow through the earthing (grounding) cable of the inverter or the converter unit to cause the
(h)
device to malfunction. In that case, disconnecting the earthing (grounding) cable from the device may stop the
malfunction of the device.
Data line filter
Data line filter is effective as an EMI countermeasure. Provide a data line filter for the detector cable, etc.
<Example> Data line filter: ZCAT3035-1330 (by TDK)
Impedance (ZCAT3035-1330)
Impedance ()
10 to 100 MHz 100 to 500 MHz
80 150
The impedance values above are reference values, and not
guaranteed values.
72
PRECAUTIONS FOR USE OF THE INVERTER
ESD-SR-250 (by NEC TOKIN)
Countermeasure
39 1
34 1
TDK
Product name Lot number
OUTLINE DIMENSION DRAWINGS (ZCAT3035-1330)
page 74.)
page 74.)
Cable fixing
band mount
[Unit: mm]