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14. OPTIONS AND AUXILIARY EQUIPMENT
(3) 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
(4) Cables
(a) Cables for the brake unit
For the brake unit, HIV wire (600V Grade heat-resistant polyvinyl chloride insulated wire) is
recommended.
1) Main circuit terminal
Wire size
Crimping
terminal
N/
, P/ , PR,
Brake unit
Main
circuit
terminal
screw
size
N/
, P/ ,
PR,
Tightening
torque
[N
m]
([Ib
in])
HIV wire [mm
2
] AWG
200V FR-BU2-15K M4 5.5-4 1.5(13.3) 3.5 12
class FR-BU2-30K M5 5.5-5 2.5(22.1) 5.5 10
FR-BU2-55K M6 14-6 4.4(38.9) 14 6
400V FR-BU2-H30K M4 5.5-4 1.5(13.3) 3.5 12
class FR-BU2-H55K M5 5.5-5 2.5(22.1) 5.5 10
N/ P/ PR
Terminal block
FR-BU2-H75K M6 14-6 4.4(38.9) 14 6