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13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
(2) Selection example
Indicated below is an example of selecting a leakage current breaker under the following conditions.
22mm
2
5mm
M
NV
Ig1 Ig2 Igm
Converter
unit
Drive
unit
Servo motor
30mm
2
5mm
Iga
Use a leakage current breaker designed for suppressing harmonics/surges.
Find the terms of Equation (13.2) from the diagram.
Ig1 = 95
1000
5
= 0.475 [mA]
Ig2 = 105
1000
5
= 0.525 [mA]
Ign = 0(not used)
Iga = 5 [mA]
Igm = 2.5 [mA]
Insert these values in Equation (13.2).
Ig
10 {0.475+0+5+1 (0.525+2.5)}
85 [mA]
According to the result of calculation, use a leakage current breaker having the rated sensitivity current (Ig)
of 85[mA] or more. A leakage current breaker having Ig of 200[mA] is used with the NV-SP/SW/CP/CW/HW
series.