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6. TROUBLESHOOTING
6-9
6
(2) Specific measures
Take the following measures against anticipated noise propagation paths. For the necessity of the
measures, refer to the levels (estimated values) of the expected effects.
: Large effect, : With effect, : Small effect,
: Without effect
Noise Propagation Paths
Air-propagated noise
Cable-
propagated
noise
Place
Measures
Radiated
by drive
unit
Radiated
b
y
power
cables
Radiated
b
y
motor
cables
Ma
g
netic
induction
noise
Static
induction
noise
Throu
g
h
power
cables
From
ground
cable
Unit
Decrease the motor tone
selection (Pr. 72) setting.
Install the FR-BIF radio
noise filter.
Install the FR-BSF01 or
FR-BLF line noise filter.
Run the power cables in a
metal conduit or use
shielded cables.
Install an insulating transformer
or noise cutting transformer.
AC power supply side
Separate the power suppl
y
line.
Install the FR-BSF01 or
FR-BLF line noise filter.
Run the motor cables in a
metal conduit or use
shielded cables.
Motor side
Use a 4-core cable as the motor
power cable and use one of its
wires as a ground wire.
Use shielded cables as the
signal input cables.
Use twisted shielded cables
as the speed input cables.
Control circuit side
Insert commercially
available ferrite cores into
the speed input cables.
Use twisted shielded cables as
the signal cables. Connect the
shield sheath to the common
of the mating equipment.
Do not run cables in parallel
with the drive unit power cable
or bundle them together.
Install the mating equipment
as far away as possible from
the drive unit and power cable.
Provide a shielding plate
between the mating
equipment and the drive
unit/power cable.
Insert commercially available
ferrite cores into the speed
input cables and like.
Mating equipment side
Decrease the output
impedance of the speed
signal output circuit.