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Chapter 8
Appendix 1. Advantageous Use of Inverters (with regard to Electrical Noise)
8-10
7 Pressure sensor
8 Position detector
(pulse generator:
PG)
9 Programmable
logic controller
(PLC)
A pressure sensor malfunctioned.
<Estimated cause>
It is considered that the pressure sensor
signal malfunction was due to noise that
came from the box body and traveled
through the shield of the shielded wire.
Erroneous-pulse outputs from a pulse
converter caused a shift in the stop
position of a crane.
<Estimated cause>
It is considered that erroneous pulses are
output by induction noise since the power
line of the motor and the signal line of the
PG are bundled in a lump.
The PLC program sometimes malfunc-
tions.
<Estimated cause>
Since the power supply system is the
same for the PLC and inverter, it is
considered that noise enters the PLC
through the power supply.
q
Install an LC filter on the input side
of the inverter.
w
Connect the shield of the shielded
wire of the pressure sensor to the 0
V line (common) of the pressure
sensor, changing the original
connection.
q
Install an LC filter and a capacitive
filter on the input side of the
inverter.
w
Install an LC filter on the output
side of the inverter.
q
Install a capacitive filter and an LC
filter on the input side of the
inverter.
w
Install an LC filter on the output
side of the inverter.
e
Lower the carrier frequency of the
inverter.
q
The shielded parts of shield wire
for sensor signals are connected
to a common point in the
system.
w
Conduction noise from the
inverter is reduced.
q
This is an example of a measure
where the power line and signal
line cannot be separated.
w
Induction noise and radiation
noise on the output side of the
inverter are reduced.
q
Total conduction noise and
induction noise in the electric
line are reduced.
No. Target device
Phenomena
Noise prevention measures
Notes
Inverter
M
Power
supply
DC
power
supply
Box body
Pressure
sensor
Shielded wire
24V
0V
Inverter
M
Power
supply
DC
power
supply
Box body
Pressure
sensor
Shielded wire
LC filter
24V
0V
Inverter
Power
supply
Converter
Pulse generator
Curtain cable
M
Inverter
Power
supply
Converter
Pulse
generator
Curtain cable
Capacitive
filter
LC filter
LC filter
Power
supply
Inverter
M
Power
supply
PLC
Signal
source
M
Inverter
Power
supply
Capacitive
filter
LC filter
LC filter
Power
supply
PLC
Signal
source
Chapter8-1(P1˜10).p65
07.8.9, 12:57
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