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.
Varistor
TND20V-431K
TND20V-471K
D
W
E
d
Maximum rating
Permissible circuit
Surge current
voltage
immunity
AC[V
]
DC[V]
8/20 s[A]
rms
275
350
10000/1 time
300
385
7000/2 time
T
Model
TND20V-431K
TND20V-471K
Note. For special purpose items for lead length (L), contact the manufacturer.
Maximum limit
Rated
Energy
pulse
immunity
power
2ms[J]
[W]
195
1.0
215
D
H
Max.
Max.
Max.
21.5
24.5
14 - 44
Static
Varistor voltage
capacity
voltage
(reference
value)
[A]
[V]
[pF]
710
1300
430(387 to 473)
100
775
1200
470(423 to 517)
T
E
(Note)L
1.0
min.
6.4
3.3
20
6.6
3.5
rating (range)
V1mA
[V]
[Unit: mm]
d
W
0.05
1.0
0.8
10.0