5 2 2
SELECTION
2) Technique examples
The following method will produce some effects with regard to inverter EMI reduction. For effects, see the preceding
page.
3300/200V
400/200V
R, S, T
U, V, W
STF
STR
SD
24VDC
2
5
0 to 5VDC
FR-
BLF
FR-
BIF
FR-
BLF
400/200V
+
−
Power
transformer
Power
source
G. Separate
power
supply line.
Control
supply
W. Insert ferrite
core available
on market.
Util
ity
p
o
wer
lin
e
Radiated
EMI
AM radio
V. Keep as far away
as possible from
ground.
F. Install insulating transformer
or EMI reduction transformer.
D. Install line noise filter
(FR-BLF, FR-BSF01)
on inverter input side.
C. Install radio noise filter
FR-BIF on inverter input side.
O. Use shielded cables
and connect shield to
SD.
Programmable controller
or microcomputer board
R. Lower impedance of output circuit.
P. Use twisted pair shielded cables
and connect shield to terminal 5.
A. Lower carrier frequency.
Inverter
H. Install line noise filter
(FR-BLF, FR-BSF01)
on inverter output side.
Motor
Control box or
machine enclosure
K. Use twisted pair
shielded cable.
DC power supply
for sensor
Sensor
Use sensor of high
EMI immunity.
L. Do not earth shield but
connect it to signal
common wire.
M. Do not earth to control
box directly.
N. Earth to control box via
0.1 to 0.01 F capacitor.
Caution: For radio EMI, sufficient effects may not
be produced by this technique in weak
wave areas such as mountains and
buildings.
E. Run cables in metal pipe (conduit)
or earth shield cable to machine
at one point.
I. Run cables in metal pipe
(conduit) or earth shield
cable to control box.
J. Use 4-core cable as motor
power line and use one
wire as earth cable.
S. Separate sensor circuit
more than 30cm (at least
10cm) away from inverter
and power line.
Q. Insert ferrite cores
available on market.
B. Increase inverter
parameter, [
Pr. 74
] (input
filter constant) setting
(note that response
level is reduced).
(L
1
, L
2
, L
3
)
Summary of Contents for FR-A700 Series
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