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14. OPTIONS AND AUXILIARY EQUIPMENT
(f) Varistors 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.
Maximum rating
Permissible circuit
voltage
Surge current
immunity
Energy
immunity
Rated
pulse
power
Maximum limit
voltage
Static
capacity
(reference
value)
Varistor voltage
rating (range)
V1mA
Varistor
AC[V
rms] DC[V] 8/20 s[A] 2ms[J] [W] [A] [V] [pF] [V]
TND20V-431K 275 350 10000/1 time
195 710 1300 430(387 to 473)
TND20V-471K 300 385 7000/2 time 215
1.0 100
775 1200 470(423 to 517)
[Unit: mm]
Model
D
Max.
H
Max.
T
Max.
E
1.0
(Note)L
min.
d
0.05
W
1.0
TND20V-431K 6.4 3.3
TND20V-471K
21.5 24.5
6.6 3.5
20 0.8 10.0
Note. For special purpose items for lead length (L), contact the manufacturer.
d
W E
H
D
L
T