Chapter 3
3-23
System Design and Installation
Note 1. To attenuate noise at frequencies of 200 kHz or less, use an insulated transformer and a
noise filter.
Note 2. For high frequencies of 30 MHz or more, use a ferrite core and a high-frequency noise filter
with a through-type capacitor.
Note 3. 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.
● 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.
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 (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.
● Surge Killers
Install surge killers for loads that have induction coils, such as relays, solenoids, brakes, clutches,
etc. The following table shows types of surge killers and recommended products.
Three-phase LF-315K 15 A Tokin
LF-325K 25 A
LF-335K 35 A
ZCW2210-01 10 A TDK
ZCW2220-01 20 A
ZCW2230-01 30 A
ZCW2240-01 40 A
Maker Model Rated current Remarks
Tokin LF-310KA 10 A Three-phase block noise filter
LF-320KA 20 A
Type Features Recommended products
Diode Diodes are relatively small devices such as relays used
for loads when reset time is not an issue. The reset time
is increased because the surge voltage is the lowest
when power is cut off. Used for 24/48-V DC systems.
Use a fast-recovery diode with a short
reverse recovery time.
Fuji Electric Co., ERB44-06 or equiv-
alent
Thyristor
or
Varistor
Thyristor and varistor are used for loads when induction
coils are large, as in electromagnetic brakes, solenoids,
etc., and when reset time is an issue. The surge voltage
when power is cut off is approximately 1.5 times that of
the varistor.
Select varistor voltage as follows:
24-V DC system: 39 V
100-V DC system: 200 V
100-V AC system: 270 V
200-V AC system: 470 V
Capacitor
+ resistor
Use capacitors and resistors for vibration absorption of
surge when power is cut off. The reset time can be short-
ened by proper selection of the capacitor or resistor.
Okaya Electric Industries Co., Ltd.
CR-50500 0.5
µF-50 Ω
CRE-50500 0.5 µF-50 Ω
S2-A-0 0.2 µF-500 Ω
Type Model Rated current Maker
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