11. OPTIONS AND AUXILIARY EQUIPMENT
11 - 77
11.15 Earth-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 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 cables as short as possible, and make the
grounding cable longer than 30 cm.
Rated sensitivity current
≥
10 • {Ig1 + Ign + Iga + K • (Ig2 + Igm)} [mA]………(11.1)
Earth-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
Ign
Noise filter
Cable
Ig1
Iga
Ig2
Igm
M
Servo
amplifier
NV
Cable
General models
BV-C1
NFB
NV-L
3
Ig1: Leakage current on the electric channel from the earth-leakage current breaker to the input
terminals of the servo amplifier (Found from Fig. 11.13.)
Ig2: Leakage current on the electric channel from the output terminals of the servo amplifier to the servo
motor (Found from Fig. 11.13.)
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 (Found from table 11.5.)
Igm: Leakage current of the servo motor (Found from table 11.4.)
Leakage current [mA]
Cable size [mm
2
]
120
100
80
60
40
20
0
2
5.5 14
3.5 8
38100
22
30
60150
80
120
100
80
60
40
20
0
2
3.5
5.5
8
14
22
38
80
150
30
60
100
Leakage current [mA]
Cable size [mm ]
2
200 V class
400 V class
Fig. 11.13 Leakage current example (lg1, lg2) for CV cable run in metal conduit
Summary of Contents for MR-J4-100A
Page 9: ...A 8 MEMO ...
Page 61: ...1 FUNCTIONS AND CONFIGURATION 1 44 MEMO ...
Page 67: ...2 INSTALLATION 2 6 MEMO ...
Page 137: ...3 SIGNALS AND WIRING 3 70 MEMO ...
Page 261: ...6 NORMAL GAIN ADJUSTMENT 6 24 MEMO ...
Page 291: ...7 SPECIAL ADJUSTMENT FUNCTIONS 7 30 MEMO ...
Page 299: ...8 TROUBLESHOOTING 8 8 MEMO ...
Page 319: ...9 OUTLINE DRAWINGS 9 20 MEMO ...
Page 461: ...12 ABSOLUTE POSITION DETECTION SYSTEM 12 36 MEMO ...
Page 511: ...14 COMMUNICATION FUNCTION 14 38 MEMO ...
Page 559: ...16 USING A DIRECT DRIVE MOTOR 16 20 MEMO ...
Page 583: ...17 FULLY CLOSED LOOP SYSTEM 17 24 MEMO ...
Page 621: ...APPENDIX App 38 ...
Page 639: ......