Mitsubishi Electric Freqrol-A100 Instruction Manual page 180

Noise Path
1
Measures
When devices which handle low-level signals and are susceptible to misoperation due to noises (such as
instruments, receivers and sensors) are installed near the inverter and their signal cables are co,ntained in
the same panel as the inverter or are run near the inverter, the devices may be misoperated by air-propagated
noises and the following measures must be taken:
(1) Install easily affected devices as away as possible from the inverter.
( 2 ) Run easily affected signal cables as away as possible from the inverter.
(3) Do not run the signal cables and power cables (inverter I10 cables) in parallel with each other and do
not bundle them.
l(4) Insert line noise filters into I10 and radio noise filters into input to suppress cable-radiated noises.
1(5)
Use shield cables for 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 misoperate the devices and the following measures must
be taken:
not bundle them.
(4) Use shield cables for signal cables and power cables and run them in individual metal conduits to produce
I
'
4)1
5 ) 1 6,
(1) Install easily affected devices as away as possible from the inverter.
(2) Run easily affected signal cables as away as possible from the inverter.
(3)
Do not run the signal cables and power cables (inverter I10 cables) in parallel with each other and do
7)
.
.
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 misoperate the
devices and the following measures must be taken:
(1) Install the radio noise filter (FR-BIF) to the power cables (Input cables) of the inverter.
8)
(2) Install the line noise filter (FR-BLF, FR-BSFO1) to the power cables (I10 cables) of the inverter.
When a closed loop circuit is formed by connecting the peripheral device wiring to the inverter, leakage
current may flow through the ground cable of the inverter to misoperate the device. In such a case,
disconnection of the ground cable of the device may cause the device to operate properly.