Mitsubishi Electric MELSERVO-JN Series, Instruction Manual

Page: 298 / 480

11 - 41
11. OPTIONS AND PERIPHERAL EQUIPMENT
Table 11.4 Servo motor’s leakage current example (Igm)
Servo motor power [kW] Leakage current [mA]
0.05 to 0.4 0.1
Table 11.5 Servo amplifier's leakage current example (Iga)
Servo amplifier capacity [kW] Leakage current [mA]
0.1 to 0.4 0.1
Table 11.6 Earth-leakage current breaker selection example
Servo amplifier
Rated sensitivity current of the earth-
leakage current breaker [mA]
MR-JN-10A(1)/20A(1)/40A 15
(2) Selection example
Indicated below is an example of selecting an earth-leakage current breaker under the following conditions.
Servo amplifier
MR-JN-40A
Servo motor
HF-KN43
2mm
2
5m
M
NV
Ig1 Iga Ig2 Igm
2mm
2
5m
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)}
4.0 [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.