96
6 OPTIONS AND PERIPHERAL EQUIPMENT
6.11 Earth-leakage current breaker
Servo motor leakage current example (Igm)
Servo amplifier leakage current example (Iga)
Earth-leakage current breaker selection example
Selection example
This section shows examples of selecting an earth-leakage current breaker under the following conditions.
Use an earth-leakage current breaker designed for suppressing harmonics/surges.
Find each term of formula (6.1) from the diagram.
Ign = 0 (not used)
Iga = 0.1 [mA]
Igm = 0.1 [mA]
Insert these values in formula (6.1).
Ig
≥
10 • {0.1 + 0 + 0.1 + 1 • (0.1 + 0.1)}
Ig
≥
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.
Use an earth-leakage current breaker having Ig of 15 mA for the NV-SP/SW/CP/CW/HW.
Servo motor output [kW]
Leakage current [mA]
0.1 to 1
0.1
1.5 to 2
0.2
3
0.3
Servo amplifier
Leakage current [mA]
MR-JET-10_
MR-JET-20_
MR-JET-40_
0.1
MR-JET-70_
MR-JET-100_
MR-JET-200_
MR-JET-300_
0.15
Servo amplifier
Rated sensitivity current of earth-leakage current breaker [mA]
MR-JET-10_ to MR-JET-300_
15
HG-KNS43_
2 mm
2
× 5 m
2 mm
2
× 5 m
NV
Ig1
Iga
Ig2
Igm
M
MR-JET-40_
Servo amplifier
Servo motor
5
1000
Ig1 = 20 •
= 0.1 [mA]
5
1000
Ig2 = 20 •
= 0.1 [mA]
Summary of Contents for Melservo-Jet MR-JET G-N1 Series
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