11 OPTIONS AND PERIPHERAL EQUIPMENT
11.15 Earth-leakage current breaker
425
11
11.15
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 is run with a commercial power supply.
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]
(11.1)
Ig1: Leakage current on the electric channel from the earth-leakage current breaker to the input terminals of the servo
amplifier
Page 426 Example of leakage current per km (lg1, lg2) for 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 426 Example of leakage current per km (lg1, lg2) for 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: Leakage current of the servo amplifier
Page 426 Servo amplifier leakage current example (Iga)
Igm: Leakage current of the servo motor
Page 426 Servo motor leakage current example (lgm)
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
Noise filter
Cable
Cable
Ig1
Iga
Ig2
Igm
M
Servo
amplifier
NV
Содержание MELSERVO-J4 series
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