Fuji Electric FRN355VG1S-4J [1019/1046] App a advantageous use of inverters notes on electrical noise

Fuji Electric FRN7.5VG1S-4J [1019/1046] App a advantageous use of inverters notes on electrical noise
App. A Advantageous Use of Inverters (Notes on electrical noise)
A-1
App.
App. A Advantageous Use of Inverters (Notes on electrical
noise)
- Disclaimer: This document provides you with a summary of the Technical Document of the Japan
Electrical Manufacturers' Association (JEMA) (December 2008). It is intended to apply to the domestic
market only. It is only for reference for the foreign market. -
A.1 Effect of inverters on other devices
Inverters have been and are rapidly expanding its application fields. This paper describes the effect
that inverters have on electronic devices already installed or on devices installed in the same system
as inverters, as well as introducing noise prevention measures. (Refer to Section A.3 [3], "Noise
prevention examples" for details.)
[ 1 ] Effect on AM radios
Phenomenon
If an inverter operates, AM radios may pick up noise radiated from the inverter.
(An inverter has almost no effect on FM radios or television sets.)
Probable cause
Radios may receive noise radiated from the inverter.
Countermeasures
Inserting a noise filter on the power supply side of the inverter is effective.
[ 2 ] Effect on telephones
Phenomenon
If an inverter operates, nearby telephones may pick up noise radiated from the
inverter in conversation so that it may be difficult to hear.
Probable cause
A high-frequency leakage current radiated from the inverter and motors enters
shielded telephone cables, causing noise.
Countermeasures It is effective to commonly connect the grounding terminals of the motors and
return the common grounding line to the grounding terminal of the inverter.
[ 3 ] Effect on pressure sensors
Phenomenon
If an inverter operates, pressure sensors may malfunction.
Probable cause
Noise may penetrate through a grounding wire into the signal line.
Countermeasures
It is effective to install a noise filter on the power supply side of the inverter or
to separate the control circuit wirings from the I/O wires and grounding wires.
[ 4 ] Effect on position detectors (pulse encoders)
Phenomenon
If an inverter operates, pulse encoders may cause a malfunction that shifts the
stop position of a machine.
Probable cause
Erroneous pulses are liable to occur when the signal lines of the PG and power
lines are bundled together.
Countermeasures The influence of induction noise and radiation noise can be reduced by
separating the PG signal lines and power lines. Providing noise filters at the
input and output terminals is also an effective measure.
[ 5 ] Effect on proximity switches
Phenomenon
If an inverter operates, proximity switches (capacitance-type) may malfunction.
Probable cause
The capacitance-type proximity switches may provide inferior noise immunity.
Countermeasures
It is effective to connect a filter to the input terminals of the inverter or
implement grounding wiring with a capacitor on the 0 V side of the proximity
switches. The proximity switches can be replaced with superior noise immunity
types such as magnetic types.

Содержание

Скачать