Chapter 4 Option and Peripheral Devices
4–14
4-2 Peripheral devices
4-2-1 Selection of wire
Select the interface unit L1, L2, L3 and grounding wires from the following wire sizes according to the
total capacity of the connected motors.
Total motor capacity 1kW or less 2.5kW or less 6kW or less 9kW or less 12kW or less
Wire size (mm
2
) IV1.25SQ IV2SQ IV3.5SQ IV5.5SQ IV8SQ
(Note) The total capacity of the motors connected to the interface unit must be 6kW or less. If the
total motor capacity exceeds 6kW, wire with a standalone terminal block.
4-2-2 Selection of no-fuse breakers
Use the following table to obtain the NFB (no-fuse breaker) rated current from the total rated capacity
(SVJ2 total output capacity) of the motor driving the SVJ2 servo amplifier to be connected to the NFB
to be selected, and select the no-fuse breaker.
When the MDS-B-SPJ2 spindle amplifier or converter unit will share no-fuse breakers, select from the
total NFB rated current of each SVJ2 total output capacity and SPJ2 spindle amplifier or convertor
unit. However, separate the SVJ2 servo amplifier no-fuse breaker from the others, and select the
NF60 type (60A) or smaller capacity dedicated for SVJ2 servo amplifiers if the total NFB rated current
exceeds 60A.
NFB rated current table
Intelligent servomotor
SVJ2 total output capacity
1.5kW or less 3.5kW or less 7kW or less 10kW or less 13kW or less 16kW or less
NFB rated current 10A 20A 30A 40A 50A 60A
MDS-B-SPJ2
MDS-B-SPJ2-02
MDS-B-SPJ2-04
MDS-B-SPJ2-075
MDS-B-SPJ2-15
MDS-B-SPJ2-22
MDS-B-SPJ2-37
MDS-B-SPJ2-55 MDS-B-SPJ2-75 MDS-B-SPJ2-110
Converter unit
MDS-A-CR-10
MDS-A-CR-15
MDS-A/B-CV-37
MDS-A-CR-22
MDS-A-CR-37
MDS-A/B-CV-55
MDS-A-CR-55
MDS-A/B-CV-75
MDS-A-CR-75
MDS-A-CR-90
MDS-A/B-CV-110
NFB rated current 10A 20A 30A 40A 50A
No-fuse breaker selection table
NFB rated current 10A 20A 30A 40A 50A 60A
Recommended NFB
(Mitsubishi Electric Corp.:
Option part)
NF30-CS3P10
A
NF30-CS3P20
A
NF30-CS3P30
A
NF50-CP3P40
A
NF50-CP3P50
A
NF60-CP3P60
A
Special order part: This part is not handled by the NC Dept. Marketing Section or dealer.
The NFB is selected for the MDS-B-SVJ2-10 with three HS-SF102 axes and one
MDS-B-SPJ2-75 axis connected.
Because there are 1kW × 3 = 3kW on the intelligent servomotor side, 20A is selected
from the table for the NFB rated current.
40A is selected from the table for the SPJ2-75 rated current.
Therefore, the total rated current is 60A, and the NF60-CP3P60A is selected.
The NFB is selected for the MDS-B-SVJ2-20 with two HS-SF202 axes and one
MDS-B-CR-90 connected.
Because there are 2kW × 2 = 4kW on the intelligent servomotor side, 30A is selected
from the table for the NFB rated current.
50A is selected from the table for the MDS-B-CV-90 rated current.
Therefore, the total rated current is 80A. The NFB is separated from converter unit,
and the NF30-CS3P30A is selected for the SVJ2. (Refer to the "MDS-A/B Series
Specifications Manual" for details on selecting the converter NFB.)
(Example 1)
(Example 2)
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