Selection Example - Mitsubishi Electric MR-J5 Series User Manual

Selection example

This section shows examples of selecting an earth-leakage current breaker under the following conditions.
For MR-J5-_G_ or MR-J5-_A_ servo amplifiers
2
2 mm × 5 m
NV
Servo amplifier
MR-J5-40G
Ig1 Iga
Use an earth-leakage current breaker designed for suppressing harmonics/surges.
Find each term of formula (6.1) from the diagram.
5
Ig1 = 20 • = 0.1 [mA]
1000
5
Ig2 = 20 • = 0.1 [mA]
1000
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 series.
2
2 mm × 5 m
Servo motor
M
HK-KT43
Ig2 Igm
6 OPTIONS AND PERIPHERAL EQUIPMENT
6.14 Earth-leakage current breaker
6
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