Instruction manual

37
2
INSTALLATION AND WIRING
Noise Path Measures
1), 2), 3)
When devices which handle low-level signals and are susceptible to
misoperation due to noise (such as instruments, receivers and
sensors) are installed near the inverter and their signal cables are
contained in the same panel as the inverter or are run near the
inverter, the devices may be misoperated by air-propagated noise
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
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) Insert line noise filters onto I/O and capacitor type filters into
inputs to suppress cable-radiated noises.
(5) Use shielded cables for signal cables and power cables and run
them in individual metal conduits to further reduce 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 causing misoperation of the devices
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
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 shielded cables for signal cables and power cables and run
them in individual metal conduits to further reduce effects.
7)
When the power supplies of the peripheral devices are connected to
the power supply of the inverter within the same line, inverter-
generated noise may flow back through the power supply cables
causing misoperation of the devices and the following measures
must be taken:
(1) Install the capacitor type filter to the power cables (input cables) of
the inverter.
(2) Install the line noise filter (FR-BLF, FR-BSF01) to the power
cables (I/O cables) of the inverter.
8)
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 causing misoperation of the device. In
such a case, disconnection of the ground cable of the device may
cause the device to operate properly.
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