11. OPTIONS AND AUXILIARY EQUIPMENT
11 - 76
(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, 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.
Maximum rated
Maximum
limit
voltage
Permissible circuit
voltage
Surge
current
immunity
Energy
immunity
Rated pulse
power
Static
capacity
(reference
value)
Varistor voltage rating
(range)
V1 mA
Power
supply
voltage
Varistor
AC[Vrms] DC[V] 8/20 µs [A] 2 ms [J] [W]
[A] [V]
[pF] [V]
TND20V-431K 275 350
10000/1
time
195 710 1300 430 (387 to 473)
200 V
class
TND20V-471K 300 385
7000/2
time
215
1.0 100
775 1200 470 (423 to 517)
400 V
class
TND20V-102K 625 825
7500/1
time
6500/2
times
400 1.0 100 1650 560 1000 (900 to 1100)
[Unit: mm]
Model
D
Max.
H
Max.
T
Max.
E
± 1.0
(Note)
L
min.
φ d
± 0.05
or less
W
1.0 or
less
TND20V-431K 6.4 3.3
TND20V-471K
21.5 24.5
6.6 3.5
20 0.8 10.0
TND20V-102K 22.5 25.5 9.5 6.4 20 0.8 10.0
Note. For special purpose items for lead length (L), contact the manufacturer.
d
WE
H
D
L
T
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