Mitsubishi Electric FR-A700 Technical Manual page 506

(5) EMI filter
The
A700 F700
equivalent to common mode filter and capacitor type
filter on the input side.
1) Installation position
Since the noise filter produces a greater effect
when it is located closer to the source of noise,
determine its installation position in consideration
of the following:
(a) When used in the inverter power supply
circuit, install the noise filter in a position
where the wiring distance from the inverter
input terminals is short.
(b) When used in the inverter output circuit, install
the noise filter in a position where the wiring
distance from the inverter output terminals is
the shortest. (The FR-BIF capacitor type filter
cannot be connected to the output circuit.)
2) Wiring
The noise filter cannot produce its effect unless it
is wired as indicated below.
The noise filter must be installed as close as
possible to the inverter and its wiring distance
minimized. In addition, the primary and secondary
wirings of the noise filter must not be close to
each other or cross each other.
For the selection of the noise filter, see page 518.
R
Power
Noise
S
supply
filter
T
As short as
possible
<Correct>
Wiring the noise filter
R
Power
S
Inverter
T
FR-BIF
Capacitor type
filter
<Correct>
Wiring the FR-BIF
(6) Surge voltage suppression filter
(FR-ASF-H, FR-BMF-H)
When a 400V class motor is inverter-driven, a micro
surge voltage attributable to wiring constants is
generated at the motor terminals and may deteriorate
the motor insulation. In such a case, the micro surge
voltage can be suppressed to 850V or less by
inserting the surge voltage suppression filter (FR-
ASF-H) in the secondary side of the inverter.
As surge voltage suppression measures at inverter
renewal to 400V non insulation-enhanced motor,
small/light FR-BMF-H as compared to the FR-ASF-H
can be used.
55K or less has a built-in filter
R
Noise
S
filter
T
Inverter
Power supply
<Incorrect>
R
R
S S
Inverter
T
T
E
FR-BIF
Terminal
Capacitor type
block
filter
<Incorrect>
FR-ASF-H
1) Installation
When energized, the surge voltage suppression
filter gets hot. Never install it near flammables or
where it can easily make contact with a human
body.
To release heat, leave at least 100mm clearances
around the filter as an installation space.
2) Wiring
(a) After checking the terminal symbols of the
(b) The wiring length between the inverter output
(c) The cable size may be any size if it is as
(d) The cable type recommended for use is a
Inverter
3) Voltage drop
A voltage drop caused by the filter is proportional
to the inverter output frequency and output
current.
The voltage drop is approximately 30V when the
inverter output frequency is 60Hz and the filter is
on at the rated current, independent of the
capacity.
4) Leakage currents
By connecting the filter, the leakage current
slightly increases. When using many filters at the
same time, take this into consideration when
540
filter terminal block, connect the cables from
the output terminals of the inverter to the filter
input terminals (U, V, W) and the cables from
the motor terminals to the output terminals (X,
Y, Z) of the filter. Incorrect wiring may damage
the device.
As the filter gets hot, avoid wiring the cables
near the resistor.
terminals and filter input terminals should be
within 5m.
The wiring length between the filter output
terminals and motor input terminals should be
within 300m.
recommended for the inverter.
heat-resistant cable.
temperature of the resistor section of the filter
rises about 70 degrees when the filter is
switched on. Therefore if the cables may
make contact with the resistor, use heat-
resistant, glass-braided cables.
Surge voltage suppression filter
X
U U
V V Y
W W Z
Inverter
Within
5m
Wiring of surge voltage suppression filter
SELECTION
Note that the
IM
Within
300m