Omron OMNUC W Series User Manual page 207

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
H Improving Encoder Cable Noise Resistance
The OMNUC W Series uses serial encoders, with phase-S signals from the encoder. The phase-S com-
munications speed is 4 Mbits/s.
In order to improve the encoder's noise resistance, take the following measures for wiring and installa-
tion.
• Always use the specified Encoder Cables.
• If lines are interrupted in the middle, be sure to connect them with connectors, making sure that the
cable insulation is not peeled off for more than 50 mm. In addition, always use shielded cable.
• Do not coil cables. If cables are long and are coiled, mutual induction and inductance will increase and
will cause malfunctions. Always use cables fully extended.
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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
3-41