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11. OPTIONS AND AUXILIARY EQUIPMENT
Table 11.4 Servo motor's leakage current example (Igm) Table 11.5 Servo amplifier's leakage current example (Iga)
Servo motor power
[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 11.6 Leakage circuit breaker selection example
Servo amplifier
Rated sensitivity current of leakage
circuit breaker [mA]
MR-J3-10B to MR-J3-350B
MR-J3-10B1 to MR-J3-40B1
MR-J3-60B4 to MR-J3-350B4
15
MR-J3-500B(4) 30
MR-J3-700B(4) 50
MR-J3-11KB(4) to MR-J3-22KB(4) 100
(2) Selection example
Indicated below is an example of selecting a leakage current breaker under the following conditions.
M
NV
Ig1 Iga Ig2 Igm
Servo
amplifier
MR-J3-40B
2mm
2
5m 2mm
2
5m
Servo motor
HF-KP43
Use a leakage current breaker generally available.
Find the terms of Equation (11.1) 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 (11.1).
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.