11. OPTIONS AND AUXILIARY EQUIPMENT
11 - 40
(e) Radio noise filter (FR-BIF)
This filter is effective in suppressing noises radiated from the power supply side of the servo
amplifier especially in 10 MHz and lower radio frequency bands. The FR-BIF is designed for the
input only.
Connection diagram
Dimensions [Unit: mm]
Make the connection cables as short as possible. Grounding is
always required.
When using the FR-BIF with a single-phase power supply, always
insulate the lead wires that are not used for wiring.
Radio noise
filter
Servo amplifier
Power
supply
MC
MCCB
L3
L2
L1
Terminal
block
Leakage current: 4 mA
29
58
42
4
Red
Blue
White
Green
44
29
7
hole
5
Approx. 300
(f) Varistor for input power supply (recommended)
Varistors are effective to prevent exogenous noise and lightning surge from entering the servo
amplifier. When using a varistor, connect it between each phase of the input power supply of the
equipment. For varistors, the TND20V-431K and TND20V-471K, manufactured by NIPPON CHEMI-
CON, are recommended. For detailed specification and usage of the varistors, refer to the
manufacturer catalog.
Varistor
Maximum rated
Maximum
limit
voltage
Static
capacity
(reference
value)
Varistor voltage rating
(range)
V1 mA
Permissible circuit
voltage
Surge
current
immunity
Energy
immunity
Rated pulse
power
AC [Vrms] DC [V] 8/20 µs [A]
2 ms [J]
[W]
[A]
[V]
[pF]
[V]
TND20V-431K 275 350
10000/1
time
195
1.0 100
710
1300
430 (387 to 473)
TND20V-471K
300
385
7000/2 times
215
775
1200
470 (423 to 517)
[Unit: mm]
W
E
H
D
L
T
d
Model
D
Max.
H
Max.
T
Max.
E
±1.0
(Note)
L
min.
φ
d
±0.05
W
±1.0
TND20V-431K
21.5 24.5
6.4 3.3
20 0.8 10.0
TND20V-471K 6.6
3.5
Note. For special purpose items for lead length (L), contact the manufacturer.
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