3-24
D
Noise Filters for Power Supply Input
Use a noise filter to attenuate extraneous noise and to diminish noise radiation from the Servo Driver.
Select a noise filter with a load current of at least twice the rated current. The following table shows noise
filters that reduce by 40 dB noise between 200 kHz and 30 MHz.
Type
Model
Rated current
Maker
Single-phase
R88A-FIW104-E
4 A
Rasmi
g p
R88A-FIW107-E
7 A
R88A-FIW115-E
15 A
R88A-FIW125-E
25 A
Three-phase
C
LF-315K
15 A
Tokin
p
230 V AC
LF-325K
25 A
LF-335K
35 A
LF-380K
80 A
ZCW2210-01
10 A
TDK
ZCW2220-01
20 A
ZCW2230-01
30 A
ZCW2240-01
40 A
ZACT2280-ME
80 A
Three-phase
C
R88A-FIW4006-E 6A
Rasmi
p
400 V AC
R88A-FIW4010-E 10A
Note 1.
To attenuate noise at frequencies of 200 kHz or less, use an insulated transformer and a noise
filter. For high frequencies of 30 MHz or more, use a ferrite core and a high-frequency noise
filter with a through-type capacitor.
Note 2.
If multiple Servo Drivers are to be connected to a single noise filter, select a noise filter with a
rated current at least two times the total rated current of all the Servo Drivers.
D
Noise Filters for Servomotor Output
Use noise filters without built-in capacitors on the Servomotor output lines. Select a noise filter with a
rated current at least two times the total rated current of the Servo Driver’s continuous output current.
The following table shows the noise filters that are recommended for Servomotor output.
Maker
Model
Rated
current
Remarks
Tokin
LF-310KA
10 A
Three-phase block noise filter
LF-320KA
20 A
p
LF-3510KA
50 A
LF-3110KA
110 A
Note 1.
Servomotor output lines cannot use the same noise filters used for power supplies.
Note 2.
Typical noise filters are used with power supply frequencies of 50/60 Hz. If these noise filters
are connected to outputs of 11.7 kHz/5.9 kHz (the Servo Driver’s PWM frequency), a very
large (about 100 times larger) leakage current will flow through the noise filter’s condenser
and the Servo Driver could be damaged.
System Design and Installation
Chapter 3
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