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13. 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
Power
supply
voltage
Varistor
AC [V
rms
] DC
[V] 8/20 s [A]
2ms [J]
[W]
[A]
[V]
[pF]
[V]
100V class TND20V-431K
275
350
10000/1 time
195
710
1300
430(387 to 473)
200V class 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
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