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14. OPTIONS AND AUXILIARY EQUIPMENT
Table 14.4 Servo motor’s leakage current example (Igm) Table 14.5 Servo amplifier's leakage current example (Iga)
Servo motor output [kW] Leakage current [mA] Servo amplifier capacity [kW] Leakage current [mA]
0.05 to 1 0.1 0.1 to 0.6 0.1
2 0.2 0.75 to 3.5 (Note) 0.15
3.5 0.3 5 7 2
5 0.5 11 15 5.5
7 0.7 22 7
11 1.0
15 1.3
Note. For the 3.5kW of 400V class, leakage current is 2mA,
which is the same as for 5kW and 7kW.
22 2.3
Table 14.6 Leakage circuit breaker selection example
Servo amplifier
Rated sensitivity current of leakage
circuit breaker [mA]
MR-J3-10T to MR-J3-350T
MR-J3-10T1 to MR-J3-40T1
MR-J3-60T4 to MR-J3-350T4
15
MR-J3-500T(4) 30
MR-J3-700T(4) 50
MR-J3-11KT(4) to MR-J3-22KT(4) 100
(2) Selection example
Indicated below is an example of selecting a leakage current breaker under the following conditions.
2mm
2
5m
2mm
2
5m
Ig1 Ig2
Servo
amplifier
Iga
M
HF-KP43
Igm
NV
MR-J3-40T
Use a leakage current breaker generally available.
Find the terms of Equation (14.1) from the diagram.
Ig1
20
1000
5
0.1
[mA]
Ig2
20
1000
5
0.1
[mA]
Ign
0 (not used)
Iga
0.1 [mA]
Igm
0.1 [mA]
Insert these values in Equation (14.1).
Ig
10 {0.1 0 0.1 1 (0.1 0.1)}
4.0 [mA]
According to the result of calculation, use a leakage current breaker having the rated sensitivity current (Ig)
of 4.0[mA] or more. A leakage current breaker having Ig of 15[mA] is used with the NV-SP/SW/CP/CW/HW
series.