Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

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14 - 93
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 Note. For the 3.5kW of 400V class, leakage current is 2mA,
which is the same as for 5kW and 7kW.
15 1.3
22 2.3
Table 14.6 Earth-leakage circuit breaker selection example
Servo amplifier
Rated sensitivity current of earth-
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 an earth-leakage current breaker under the following conditions.
M
0.4kW
NV
2mm
2
× 5m 2mm
2
× 5m
Servo amplifier Servo motor
HF-KP43
Igm Ig2 Iga Ig1
Use an earth-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 an earth-leakage current breaker having the rated sensitivity
current (Ig) of 4.0[mA] or more. An earth-leakage current breaker having Ig of 15[mA] is used with the NV-
SP/SW/CP/CW/HW series.