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11. OPTIONS AND PERIPHERAL EQUIPMENT
11 - 44
Table 11.2 Servo motor leakage current example (lgm)
Servo motor power [kW] Leakage current [mA]
0.1 to 1 0.1
1.5 to 2 0.2
3 0.3
Table 11.3 Servo amplifier leakage current example (Iga)
Servo amplifier capacity [kW] Leakage current [mA]
0.1 to 0.4 0.1
0.75 to 3 0.15
Table 11.4 Earth-leakage current breaker selection example
Servo amplifier capacity [kW]
Rated sensitivity current of earth-
leakage current breaker [mA]
MR-JE-10B to MR-JE-300B 15
(2) Selection example
Indicated below is an example of selecting an earth-leakage current breaker under the following
conditions.
Servo moto
r
HG-KN43
2 mm
2
× 5 m 2 mm
2
× 5 m
M
NV
Ig1 Iga Ig2 Igm
Servo amplifier
MR-JE-40B
Use an earth-leakage current breaker designed for suppressing harmonics/surges.
Find the terms of equation (11.1) from the diagram.
Ig1 = 20 •
5
1000
= 0.1 [mA]
Ig2 = 20 •
5
1000
= 0.1 [mA]
Ign = 0 (not used)
Iga = 0.1 [mA]
Igm = 0.1 [mA]
Insert these values in equation (11.1).
Ig ≥ 10 • {0.1 + 0 + 0.1 + 1 • (0.1 + 0.1)}
≥ 4 [mA]
According to the result of calculation, use an earth-leakage current breaker having the rated sensitivity
current (Ig) of 4.0 mA or more.
An earth-leakage current breaker having Ig of 15 mA is used with the NV-SP/SW/CP/CW/HW series.