Omron OMNUC W Series User Manual page 192

System Design and Installation
D 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.
Driver
R88D-WTA3HL to -WT02HL
R88D-WTA3H to -WT04H
R88D-WT05H to -WT10H
R88D-WT15H
R88D-WT20H/-WT30H
R88D-WT50H
R88D-WT60H
Note 1. The above leakage current is for cases where Servomotor power line length is less than 10
meters. (It varies depending on the power line 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
AC power
supply side
D Harmonic Current Countermeasures (AC Reactor)
The AC Reactor is used for suppressing harmonic currents. It suppresses sudden and quick changes in
electric currents.
In September 1994, the Ministry of International Trade and Industry established guidelines for the sup-
pression of harmonic waves emitted from home and general electric appliances. To comply with the
guidelines, appropriate measures are required to suppress the influence of harmonic waves on power
supply lines.
Select the proper AC Reactor model according to the Servo Driver that is to be used.
Note DC Reactors cannot be connected to the R88D-WT60H, so use an AC Reactor instead.
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Leakage current (resistor/capacitor measurement)
(commercial power supply frequency range)
16 mA
8 mA
3 mA
5 mA
6 mA
9 mA
21 mA
No-fuse Surge
breaker absorber
Leakage Noise Servo Driver
breaker filter side
Chapter 3