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6 OPTIONS AND PERIPHERAL EQUIPMENT
6.11 Earth-leakage current breaker
95
6
6.11
Earth-leakage current breaker
Selection method
High-frequency chopper currents controlled by pulse width modulation flow in the AC servo circuits. Leakage currents
containing harmonic contents are larger than those of the motor, which runs on AC power.
Select an earth-leakage current breaker according to the following formula, and ground the servo amplifier, servo motor, etc.
securely.
To minimize leakage currents, make the input and output wires as short as possible, and keep a distance of 30 cm or longer
between the wires and ground.
Rated sensitivity current
≥ 10 • {Ig1 + Ign + Iga + K • (Ig2 + Igm)} [mA] . . . (6.1)
Ig1: Leakage current on the electric channel from the earth-leakage current breaker to the input terminals of the servo
amplifier

Page 95 Example of leakage current (Ig1, Ig2) per km of CV cable run in metal conduit
Ig2: Leakage current on the electric channel from the output terminals of the servo amplifier to the servo motor

Page 95 Example of leakage current (Ig1, Ig2) per km of CV cable run in metal conduit
Ign: Leakage current when a filter is connected to the input side (4.4 mA per FR-BIF(-H))
Iga: Servo amplifier leakage current

Page 96 Servo amplifier leakage current example (Iga)
Igm: Servo motor leakage current

Page 96 Servo motor leakage current example (Igm)
Example of leakage current (Ig1, Ig2) per km of CV cable run in metal conduit
• 200 V class
Earth-leakage current breaker K
Type Mitsubishi Electric products
Models provided with harmonic and surge reduction
techniques NV-SP
NV-SW
NV-CP
NV-CW
NV-HW 1
General models BV-C1
NFB
NV-L 3
Ign Ig1 Iga Ig2 Igm
M
NV
Cable
Noise filter
Cable
Servo
amplifier
120
100
80
60
40
20
0
2 5.5 14
3.5 8
38 100
22
30
60 150
80
Leakage current [mA]
Wire size [mm²]