SMC Networks LECSN-T Series - Page 374

11. OPTIONS AND PERIPHERAL EQUIPMENT
11 - 30
Table 11.2 Servo motor leakage current example (lgm)
Servo motor power [W]
Leakage current [mA]
50 to 750
0.1
Table 11.3 Driver leakage current example (Iga)
Driver capacity [W]
Leakage current [mA]
100 to 400
0.1
750
0.15
Table 11.4 Earth-leakage current breaker selection example
Driver
Rated sensitivity current of earth-
leakage current breaker [mA]
LECSB2-T
□
15
(2) Selection example
Indicated below is an example of selecting an earth-leakage current breaker under the following
conditions.
Servo motor
HG-KR43
2 mm
2
× 5 m2 mm
2
× 5 m
M
NV
Ig1 Iga Ig2 Igm
Servo amplifier
MR-J4-40B
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.
Driver
LECSN2-T8
LE-T8-□