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11. OPTIONS AND PERIPHERAL EQUIPMENT
11 - 32
(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 5 m (twist five times or more per
one meter). Even when the cable is twisted, the cable should be less than 10 m. Using cables longer
than 5 m without twisting or twisted cables longer than 10 m may result in the brake unit malfunction.
Servo amplifie
r
Brake unit
5 m or less 5 m or less
Servo amplifie
r
Brake unit
10 m or less 10 m or less
P+
N-
P/+
N/-
P
PR
P
PR
P/+
N/-
P
PR
P
PR
Twist Twist
Resistor unit Resistor unit
P+
N-
(4) Wires
(a) Wires for the brake unit
For the brake unit, HIV wire (600 V Grade heat-resistant polyvinyl chloride insulated wire) is
recommended.
1) Main circuit terminal
N/- P/+ PR
Terminal block
Brake unit
Main
circuit
terminal
screw
size
Crimp
terminal
Tightening
torque
[N•m]
Wire size
N/-, P/+,
PR,
N/-, P/+, PR,
HIV wire
[mm
2
]
AWG
200 V
class
FR-BU2-15K M4 5.5-4 1.5 3.5 12
FR-BU2-30K M5 5.5-5 2.5 5.5 10
FR-BU2-55K M6 14-6 4.4 14 6
400 V
class
FR-BU2-H30K M4 5.5-4 1.5 3.5 12
FR-BU2-H55K M5 5.5-5 2.5 5.5 10
FR-BU2-H75K M6 14-6 4.4 14 6