MITSUBISHI ELECTRIC MR-J2S- A - Manual (Page 242)

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13. OPTIONS AND AUXILIARY EQUIPMENT
(c) Precautions for wiring
The cables between the servo amplifier and the brake unit, and between the resistor unit and the
brake unit should be as short as possible. Always twist the cable longer than 5m (twist five times
or more per one meter). Even when the cable is twisted, the cable should be less than 10m. Using
cables longer than 5m without twisting or twisted cables longer than 10m, may result in the brake
unit malfunction.
Servo amplifier
Brake unit
5m or less 5m or less
Servo amplifier
Brake unit
10m or less 10m or less
P
N
P
N
P
PR PR
P
N
P
PR
P
PR
Twist
Resistor unit Resistor unit
P
N
Twist P
(d) Cables
For the brake unit, HIV cable (600V grade heat-resistant PVC insulated wire) is recommended.
a) Main circuit terminal
Cable size Crimping
terminal N/ , P/ , PR,
Brake unit
Main
circuit
terminal
screw
size
N/ , P/ ,
PR,
Tightening
torque
[N m]
([lb in])
HIV cables,
etc. [mm 2 ]
AWG
FR-BU2-15K M4 5.5-4 1.5 (13.3) 3.5 12
FR-BU2-30K M5 5.5-5 2.5 (22.1) 5.5 10
N/ P/ PR
Terminal block
FR-BU2-55K M6 14-6 4.4 (38.9) 14 6
b) Control circuit terminal
POINT
Undertightening can cause a cable disconnection or malfunction.
Overtightening can cause a short circuit or malfunction due to damage to
the screw or the brake unit.
A
RES
PC
B
SD
BUE
C
MSG
SD
MSG SD SD
Jumper
Terminal block
6mm
Sheath
Core
Wire the stripped cable after twisting to prevent the cable
from becoming loose. In addition, do not solder it.
Screw size: M3
Tightening torque: 0.5N m to 0.6N m
Cable size: 0.3mm
2 to 0.75 mm 2
Screw driver: Small flat-blade screwdriver
(Tip thickness: 0.4mm/Tip width 2.5mm)