Mitsubishi Electric FR-A700 Technical Manual page 488

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