Chapter 3
3-34
System Design and Installation
● 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.
Note Thyristors and varistors are made by the following companies. Refer to manufacturers docu-
mentation for operating details.Thyristors: Ishizuka Electronics Co.
Varistors: Ishizuka Electronics Co., Matsushita Electric Industrial Co.
● Contactors
When selecting contactors, take into consideration the circuit’s inrush current and the maximum
momentary current. The Servo Driver inrush current is covered in the preceding explanation of no-
fuse-breaker selection, and the maximum momentary current is approximately twice the rated cur-
rent. The following table shows the recommended contactors.
● Leakage Breakers
Select leakage breakers designed for inverters.
Since switching takes place inside the Servo Drivers, harmonic current leaks from the armature of
the motor. With inverter leakage breakers, harmonic current is not detected, preventing the breaker
from operating due to leakage current.
When selecting leakage breakers, remember to also add the leakage current from devices other than
the Servomotor, such as machines using a switching power supply, noise filters, inverters, and so on.
For details on leakage breakers, refer to the manufacturer’s catalog.
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
Maker Model Rated current Coil voltage
OMRON LC1-D093A60 11 A 200 V AC
LC1D25106 26 A
LC1D40116 35 A
LC1D50116 50 A
LC1-D093A60 11 A 24 V DC
LP1D25106 26 A
LP1D40116 35 A
LP1D50116 50 A
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