4 System Design
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G5-series Linear Motors/Servo Drives With Built-in EtherCAT Communications
• Select a leakage breaker for high frequencies and surge resistance.
• When selecting leakage breakers, remember to add the leakage current from devices other than the
motor, such as devices using a switching power supply, noise filters, inverters, and so on.
To prevent malfunction due to inrush current, we recommend using a leakage breaker of 10 times the
total of all leakage current values.
• The leakage breaker is activated at 50% of the rated current. Select a leakage breaker with
approximately twice the capacity.
• For details on leakage breakers selection method, refer to the manufacturer’s catalog.
• Because switching takes place inside the Servo Drives, high-frequency current leaks from the SW
elements of the Servo Drive, the armature of the motor, and the cables.
High-frequency, surge-resistant leakage breakers, because they do not detect high-frequency
current, can prevent operation with high-frequency leakage current.
When using a general leakage breaker, use 3 times the total of the leakage current given in the
following table as a reference value.
The following table shows the leakage current of each Servo Drive model.
Note 1 These values vary greatly depending on the installation conditions of the motor power cable and the
measurement conditions. Use them for reference only.
2 The leakage current with a power cable length of 20 m is at most approximately twice as large as that with
a power cable length of 3 m.
3 The leakage current with a single-phase 200-VAC input power supply is approximately 0.8 times as large
as that with a 3-phase input power supply.
Leakage Breaker
Servo Drive model Input power supply
Leakage current
(Power cable: 3 m)
R88D-KN01L-ECT-L Single-phase 100 V 0.6 mA
R88D-KN02L-ECT-L Single-phase 100 V 0.6 mA
R88D-KN04L-ECT-L Single-phase 100 V 0.7 mA
R88D-KN01H-ECT-L 3-phase 200 V 1.3 mA
R88D-KN02H-ECT-L 3-phase 200 V 1.3 mA
R88D-KN04H-ECT-L 3-phase 200 V 1.4 mA
R88D-KN08H-ECT-L 3-phase 200 V 1.6 mA
R88D-KN10H-ECT-L 3-phase 200 V 1.8 mA
R88D-KN15H-ECT-L 3-phase 200 V 3.5 mA
R88D-KN06F-ECT-L 3-phase 400 V 3.0 mA
R88D-KN10F-ECT-L 3-phase 400 V 3.4 mA
R88D-KN15F-ECT-L 3-phase 400 V 4.0 mA
R88D-KN20F-ECT-L 3-phase 400 V 4.9 mA
R88D-KN30F-ECT-L 3-phase 400 V 8.6 mA
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