Selection Example - Mitsubishi Electric -MR-CV User Manual

Selection example

This section shows examples of selecting an earth-leakage current breaker under the following conditions.
2
22 mm × 5 m
NV
Ig1
Use an earth-leakage current breaker designed for suppressing harmonics/surges.
Find each term of formula (10.1) from the diagram.
5
Ig1 = 95 • = 0.475 [mA]
1000
5
Ig2 = 105 • = 0.525 [mA]
1000
Ign = 0 (not used)
Iga = 5 [mA]
Igm = 2.5 [mA]
Insert these values in formula (10.1).
Ig ≥ 10 • {0.475 + 0 + 5 + 1 • (0.525 + 2.5)}
Ig ≥ 85 [mA]
According to the result of calculation, use an earth-leakage current breaker with a rated sensitivity current (Ig) of 85 mA or
more.
Use 200 mA for the NV-SV/NV-SVF/NV-SW/NV-CV/NV-CVF/NV-CW/NV-HV series.
10 OPTIONS AND PERIPHERAL EQUIPMENT
102
10.6 Earth-leakage current breaker
30 mm
Converter
Drive unit
unit
Ig2
Iga
2
× 5 m
M Servo motor
Igm