6 OPTIONS AND PERIPHERAL EQUIPMENT
6.14 Earth-leakage current breaker
185
6
6.14
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 servo 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.
For MR-J5-_G_ or MR-J5-_A_ servo amplifiers
Rated sensitivity current ≥ 10 • {Ig1 + Ign + Iga + K • (Ig2 + Igm)} [mA] . . . (6.1)
For MR-J5W-_G servo amplifiers
Rated sensitivity current ≥ 10 • {Ig1 + Ign + Iga + K • (Ig2 (A-axis) + Igm (A-axis) + Ig2 (B-axis) + Igm (B-axis) + Ig2 (C-axis) +
Igm (C-axis))} [mA] . . . (6.2)
Ig1: Leakage current on the electric channel from the earth-leakage current breaker to the input terminals of the servo
amplifier
Page 186 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 186 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 one FR-BIF(-H))
Iga: Servo amplifier leakage current
Page 186 Servo amplifier leakage current example (Iga)
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
Ign
Ig1
Iga
Ig2
Igm
Ig2
Igm
Ig2
Igm
M
NV
M
M
Cable
A-axis
Cable
Noise filter
Cable
Servo
amplifier
B-axis
Cable
C-axis
Содержание MR-J5 Series
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