Mitsubishi Electric MR-J4W2, Instruction Manual

Page: 272 / 542

11. OPTIONS AND AUXILIARY EQUIPMENT
11 - 43
(2)
Selection example
Indicated below is an example of selecting an earth-leakage current breaker under the following
conditions.
NV
Ig1 Iga
Servo amplifier
MR-J4W3-222B
Cable
Ig2 Igm
M
Cable
Ig2 Igm
M
A-axis servo motor
HG-KR23
C-axis servo motor
HG-KR23
Cable
Ig2 Igm
M
B-axis servo motor
HG-KR23
2 mm 2 × 5 m
2 mm 2 × 5 m
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 = 0.15 [mA]
Igm = 0.1 [mA]
Insert these values in equation (11.1).
Ig ≥ 10 • {0.1 + 0 + 0.15 + 1 • (0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1)}
≥ 8.5 [mA]
According to the result of calculation, use an earth-leakage current breaker having the rated sensitivity
current (Ig) of 8.5 mA or more.
An earth-leakage current breaker having Ig of 15 mA is used with the NV-SP/SW/CP/CW/HW series.