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6 OPTIONS AND PERIPHERAL EQUIPMENT
6.14 Noise reduction techniques
■Varistor for input power supply (recommended)
Varistors are effective to prevent exogenous noise and lightning surges 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,
TND20V-471K, and TND20V-102K manufactured by Nippon Chemi-Con are recommended. For detailed specification and
usage of the varistors, refer to the manufacturer catalog.
[Unit: mm]
*1 For special purpose items for lead length (L), contact the manufacturer.
Power
supply
voltage
Varistor Maximum rating Maximum
limit voltage
Static
capacity
(reference
value)
Varistor voltage
rating (range) V1
mA
Permissible
circuit voltage
Surge
current
immunity
Energy
immunity
Rated
pulse
power
[A] [V]
AC
[Vrms]
DC [V] 8/20 μs [A] 2 ms [J] [W] [pF] [V]
200 V
class
TND20V-431K 275 350 10000/1 time
7000/2 times
195 1.0 100 710 1300 430 (387 to 473)
TND20V-471K 300 385 215 775 1200 470 (423 to 517)
Model D Max. H Max. T Max. E ±1.0 L Min.
*1
φd ±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
W
E
H
D
L
T
d
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