3-24
Maker Model Varistor
voltage
Max. limit
voltage
Surge
immunity
Energy
resistance
Type
Matsushita Electric
ERZC20EK471(W) 470 V 775 V 5,000 A 150 J
Block
ERZC25EK471(W) 470 V 775 V 10,000 A 225 J
ERZC32EK471(W) 470 V 775 V 20,000 A 405 J
Ishizuka Electronics Co.
Z25M471S 470 V 775 V 10,000A 235 J
Block
Z33M471S 470 V 775 V 20,000 A 385 J
Note 1. The (W) for the Matsushita models indicates that they are UL and CSA certified.
Note 2. Refer to the manufacturers’ documentation for operating details.
Note 3. The surge immunity is for a standard impulse current of 8/20 µs. If pulses are wide, either decrease the
current or change to a larger-capacity surge absorber.
Note 4. The energy resistance is the value for 2 ms. It may not be possible to retard high-energy pulses at less
than 700 V. In that case, absorb surges with an insulated transformer or reactor.
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 an effective load current of at least twice the rated current. The effective load
current is the total of the rated currents for the main circuit power supply input and the control circuit
power supply input given in 3-2-3 Terminal Block Wiring. 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
GT-2050 5 A
NEC TOKIN
LF-210N 10 A
LF-215N 15 A
LF-220N 20 A
Three-phase
LF-315K 15 A
NEC TOKIN
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
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.
System Design and Installation
Chapter 3
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