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11. Options and peripheral devices
(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.
Power
supply
Varistor
voltage
TND20V-431K
200 V
class
TND20V-471K
D
W
E
Maximum rating
Surge
Permissible circuit
current
voltage
immunity
8/20 μs [A]
AC [Vrms] DC [V]
10000/1
275
350
time
7000/2
300
385
time
T
Model
TND20V-431K
TND20V-471K
Note. For special purpose items for lead length (L), contact the manufacturer.
Maximum
voltage
Energy
Rated pulse
immunity
power
[A]
2 ms [J]
[W]
195
1.0
100
215
D
H
Max.
Max.
Max.
21.5
24.5
11 - 46
Static
limit
Varistor voltage rating
capacity
(reference
value)
[V]
[pF]
710
1300
430 (387 to 473)
775
1200
470 (423 to 517)
T
E
(Note) L
± 1.0
min.
± 0.05
6.4
3.3
20
6.6
3.5
(range)
V1 mA
[V]
[Unit: mm]
d
W
± 1.0
0.8
10.0
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