Mitsubishi Electric FR-F500 Instruction Manual page 53

Noise Path
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 effected by air-propagated noises
and the following measures must be taken:
(1) Install easily affected devices as far away as possible from the inverter.
1) 2) 3) (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) Inset line noise filters into I/O and radio noise filters into input side to suppress cable-radiated noises.
(5) Use shielded cables for signal cables and power cables and run them in individual metal conduits to reduce
further effects.
When the signal cables are run in parallel with or bundled with the power cables, magnetic and static induction
noise may be propagated to the signal cables to effect 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 form the inverter.
4) 5) 6)
(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 reduce
further effects.
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 to misoperate the devices
7) and the following measures must be taken:
(1) Install the radio noise filter (FR-BIF) to the power cables (input cables) of the inverter.
(2) Install the line noise filter (FR-BLF) to the power cables (I/O cables) of the inverter.
When a closed loop circuit is formed by connecting the peripheral device wiring to the inverter, leakage current
8) may flow through the ground cable of the inverter to affect the device. In such a case, disconnection of the
ground cable of the device may cause the device to operate properly.
• • • • Data line filter
Noise entry can be prevented by providing a data line filter for the detector cable etc.
INSTALLATION AND WIRING
Measures
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