Fuji Electric FRN355VG1S-4J Инструкция по эксплуатации онлайн [1028/1046] 465071

Fuji Electric FRN110VG1S-4J Инструкция по эксплуатации онлайн [1028/1046] 465064
A-10
Table A.2 Continued
No.
Target
device
Phenomena Noise prevention measures
Notes
5
Photo-
electric
relay
A photoelectric relay
malfunctioned when the
inverter was operated.
<Possible cause>
Although the inverter and
photoelectric relay are
separated by a sufficient
distance but the power
supplies share a common
connection, it is considered
that conduction noise entered
through the power supply line
into the photoelectric relay.
1) Insert a 0.1 μF capacitor
between the output
common terminal of the
amplifier of the
photoelectric relay and
the frame.
1) If a low-current
circuit at the
malfunctioning
side is observed,
the measures
may be simple
and economical.
6
Prox-
imity
switch
(capaci-
tance
type)
A proximity switch
malfunctioned.
<Possible cause>
It is considered that the
capacitance type proximity
switch is susceptible to
conduction and radiation
noise because of its low
noise immunity.
1) Install an LC filter at the
output side of the inverter.
2) Install a capacitive filter
at the input side of the
inverter.
3) Ground the 0 V (common
mode) line of the DC
power supply of the
proximity switch through
a capacitor to the box
body of the machine.
Output
LC filter
1) Noise generated
in the inverter
can be reduced.
2) The switch is
superseded by a
proximity switch
of superior noise
immunity (such
as a magnetic
type).

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