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10. OPTIONS AND AUXILIARY EQUIPMENT
10.3.5 Leakage current breaker
(1) 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 a leakage current breaker according to the following formula, and ground the servo amplifier,
servo motor, etc. securely.
Make the input and output cables as short as possible, and also make the grounding cable as long as
possible (about 30cm (11.8 in)) to minimize leakage currents.
Rated sensitivity current 10 {Ig1 Ign Iga K (Ig2 Igm)} [mA] ................................................ (10.1)
K: Constant considering the harmonic contents
Leakage current breaker
Type
Mitsubishi
products
K
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
M
Noise filter
Cable
NV
Ig1 Ign
Ig2
Igm
Iga
Cable
Servo
amplifier
Converter
unit
Ig1:
Leakage current on the electric channel from the leakage current breaker to the input terminals
of the servo amplifier (Found from Fig. 10.1.)
Ig2:
Leakage current on the electric channel from the output terminals of the servo amplifier to the
servo motor (Found from Fig. 10.1.)
Ign:
Leakage current when a filter is connected to the input side (4.4mA per one FR-BIF or FR-BIF-H)
Iga:
Leakage current of the servo amplifier (Found from Table 10.3.)
Igm:
Leakage current of the servo motor (Found from Table 10.2.)
Table 10.2 Servo Motor’s Leakage Current Example (lgm)
Table 10.3 Converter Unit
Servo Amplifier's Leakage
Current Example (Iga)
Servo Motor Output
[kW]
Leakage
Current[mA]
Converter Unit
Servo Amplifier
Leakage
Current[mA]
30 to 55
2.5
All series
5
120
100
80
60
40
20
0
2 3.5
5.5
8 14 2238 80150
3060 100
Cable size[mm
2
]
[mA]
Le
a
k
age cur
rent
a) 200V class
120
100
80
60
40
20
0
2
3.5
5.5
8
14
22
38
80
150
30
60
100
Cable size [mm
2
]
[m
A
]
Leakage current
b) 400V class
Fig.10.1 Leakage Current Example (lg1, lg2) for CV Cable Run in Metal Conduit
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