Fuji Electric FRN355VG1S-4J Инструкция по эксплуатации онлайн [1029/1046] 465071

Fuji Electric FRN5.5VG1S-2J Инструкция по эксплуатации онлайн [1029/1046] 465045
App. A Advantageous Use of Inverters (Notes on electrical noise)
A-11
App.
Table A.2 Continued
No.
Target
device
Phenomena Noise prevention measures
Notes
7
Pressure
sensor
A pressure sensor
malfunctioned.
<Possible cause>
The pressure sensor may
malfunction due to noise that
came from the box body
through the shielded wire.
1) Install an LC filter on
the input side of the
inverter.
2) Connect the shield of
the shielded wire of the
pressure sensor to the 0
V line (common mode)
of the pressure sensor,
changing the original
connection.
Input LC filter
1) The shielded parts
of shield wires for
sensor signals are
connected to a
common point in
the system.
2) Conduction noise
from the inverter
can be reduced.
8
Position
detector
(pulse
encoder)
Erroneous-pulse outputs from
a pulse converter caused a
shift in the stop position of a
crane.
<Possible cause>
Erroneous pulses may be
outputted by induction noise
since the power line of the
motor and the signal line of
the PG are bundled together.
1) Install an LC filter and a
capacitive filter at the
input side of the inverter.
2) Install an LC filter at the
output side of the inverter.
Input
LC filter
Output
LC filter
1) This is an
example of a
measure where
the power line and
signal line cannot
be separated.
2) Induction noise
and radiation
noise at the
output side of the
inverter can be
reduced.
9
Program
mable
logic
controller
(PLC)
The PLC program
malfunctions.
<Possible cause>
Since the power supply
system is the same for the
PLC (programmable logic
controller) and inverter, it is
considered that noise enters
the PLC through the power
supply.
1) Install a capacitive filter
and an LC filter on the
input side of the inverter.
2) Install an LC filter on the
output side of the inverter.
3) Lower the carrier
frequency of the inverter.
Output
LC filter
Input
LC filter
1) Total conduction
noise and
induction noise in
the electric line
can be reduced.

Содержание

Скачать