Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 424

■Line noise filter (FR-BSF01/FR-BLF)
This filter is effective in suppressing noises radiated from the power supply side and output side of the servo amplifier and
also in suppressing high-frequency leakage current (0-phase current). It especially affects the noises between 0.5 MHz and 5
MHz band.
Connection diagram
The line noise filters can be mounted on lines of the main power supply (L1/
L2/L3) and of the servo motor power (U/V/W). Pass each of the wires through
the line noise filter an equal number of times in the same direction. For wires
of the main power supply, the effect of the filter rises as the number of passes
increases, but generally four passes would be appropriate. For the servo
motor power lines, passes must be four times or less. Do not pass the
grounding wire through the filter. Otherwise, the effect of the filter will drop.
Wind the wires by passing through the filter to satisfy the required number of
passes as shown in Example 1. If the wires are too thick to wind, use two or
more filters to have the required number of passes as shown in Example 2.
Place the line noise filters as close to the servo amplifier as possible for their
best performance.
Example 1
MCCB MC
Power
supply
Line noise
filter
(Number of passes: 4)
Example 2
MCCB MC
Power
supply
Line noise
filter
Two filters are used
(Total number of passes: 4)
11 OPTIONS AND PERIPHERAL EQUIPMENT
422
11.14 Noise reduction techniques
Servo amplifier
L1
L2
L3
Servo amplifier
L1
L2
L3
Dimensions [Unit: mm]
2
FR-BSF01 (for wire size 3.5 mm
Approx. 110
95 ± 0.5
Approx. 65
33
2
FR-BLF (for wire size 5.5 mm (AWG 10) or more)
7
130
85
160
180
(AWG 12) or less)
2- 5