Mitsubishi Electric FR-E540 Instruction Manual download pdf (Page 44)

INSTALLATION AND WIRING

In-

verter

ReceiverInstrument

Telephone

Motor

Sensor

Sensor power supply

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 affected by air-propagated noises

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) 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.

4) 5) 6)

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.

(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

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, FR-BSF01) 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

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.

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Mitsubishi Electric FR-E540 Instruction Manual Page 44

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