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15. 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.
NV
22mm
2
5m 30mm
2
5m
M
Ig1 Ig2 Igm
Converter
unit
Drive
unit
Iga
Servo motor
Use a leakage current breaker designed for suppressing harmonics/surges.
Find the terms of Equation (15.2) 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 (15.2).
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.