Chapter 3
3-24
System Design and Installation
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.
The following table shows the Servomotor leakage current for each Servo Driver model.
Note 1. The above leakage current is for cases where Servomotor power line length is less than 5
meters. (It varies depending on the Servomotor cable length and the insulation.)
Note 2. The above leakage current is for normal temperature and humidity. (It varies depending on
the temperature and humidity.)
Leakage Breaker Connection Example
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
Driver Leakage current (direct measurement)
(including high-frequency current)
R7D-APA3L to -AP04L 29 mA
R7D-APA3H to -AP04H 14 mA
R7D-AP08H 16 mA
AC power supply side
No-fuse breaker
Surge absorber
Leakage breaker
Noise filter
Servo Driver side
1
2
3
4
5
6
E
NF
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