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Noise Path Measures
1, 2, 3
When devices which handle low-level signals and are susceptible to noises (such as instruments, receivers
and sensors) are installed near the high power factor converter and their signal cables are contained in the
same panel as the high power factor converter or are run near the high power factor converter, the devices
may be affected by air-propagated noises and the following measures must be taken:
(1) Install easily affected devices as far away from the high power factor converter and inverter as possible.
(2) Run easily affected signal cables as far away from the high power factor converter and inverter as
possible.
(3) Do not run the signal cables and power cables (high power factor converter I/O cables) in parallel with
each other and do not bundle them.
(4) Insert line noise filters into I/O and radio noise filters into cables input to suppress cable-radiated noises.
(5) Use shield cables for signal cables and power cables and run them in individual metal conduits to
produce further 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 to affect the devices and the following measures
must be taken:
(1) Install easily affected devices as far away from the high power factor converter and inverter as possible.
(2) Run easily affected signal cables as far away from the high power factor converter and inverter as
possible.
(3) Do not run the signal cables and power cables (high power factor converter and inverter I/O cables) in
parallel with each other and do not bundle them.
(4) Use shield cables for signal cables and power cables and run them in individual metal conduits to
produce further effects.
7
When the power supplies of the peripheral devices are connected to the power supply of the high power factor
converter in the same line, high power factor converter-generated noises may flow back through the power
supply cables to 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 high power factor converter.
(2) Install the line noise filter (FR-BLF) to the power cables (I/O cables) of the high power factor converter.
8
When a closed loop circuit is formed by connecting the peripheral device wiring to the high power factor
converter, leakage current may flow through the ground cable of the high power factor converter to affect the
device. In such a case, disconnection of the ground cable of the device may cause the device to operate
properly.
Telephone
IM
Sensor
Motor
Instrument
Receiver
Reactor 1
Reactor 2
External box
Inverter
High power
factor
converter
8
2
5
7
7
2
1
3
3
6
4
Sensor
power supply