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Brake unit
FR-BU-(H)K
Resistor unit
FR-BR-(H)K
The brake unit and resistor unit are options that will fully exhibit the regenerative braking capability of the inverter and are always used as a set.
There are six different brake units as in the following table, from which make selection according to the necessary braking torque and deceleration
time.
The brake unit is equipped with a seven-segment LED that displays the duty (%ED) and alarm.
Brake unit selection table
Brake unit and resistor unit combinations and used cables
Connection example
*1. Connect the inverter terminals (P/+, N/-) and brake unit (FR-BU (H)) terminals so that their
terminal signals match with each other.
(Incorrect connection will damage the inverter.)
*2. When the power supply is 400V class, install a step-down transformer.
Name (type) Specifications, Structure, etc.
%ED at short-time rating when braking torque is 100%
Motor Capacity
5.5kW 7.5kW 11kW 15kW 18.5kW 22kW 30kW 37kW 45kW 55kW
Inverter
200V 5.5K 7.5K 11K 15K 18.5K 22K 30K 37K 45KK 55K
400V 5.5K 7.5K 11K 15K 18.5K 22K 30K 37K 45KK 55K
Brake unit
2
0
0
V
FR-BU-15K
%ED
80 40 15 10 ------ ------ ------ ------ ------ ------
FR-BU-30K ------ ------ 65 30 25 15 10 ------ ------ ------
FR-BU-55K ------ ------ ------ ------ 90 60 30 20 15 10
4
0
0
V
FR-BU-H15K
%ED
80 40 15 10 ------ ------ ------ ------ ------ ------
FR-BU-H30K ------ ------ 65 30 25 15 10 ------ ------ ------
FR-BU-H55K ------ ------ ------ ------ 90 60 30 20 15 10
Braking torque (%) at short-time rating when 10%ED is 15s
Motor Capacity
5.5kW 7.5kW 11kW 15kW 18.5kW 22kW 30kW 37kW 45kW 55kW
Inverter
200V 5.5K 7.5K 11K 15K 18.5K 22K 30K 37K 45KK 55K
400V 5.5K 7.5K 11K 15K 18.5K 22K 30K 37K 45KK 55K
Brake unit
2
0
0
V
FR-BU-15K
Braking
Torque
(%)
280 200 120 100 80 70 ------ ------ ------ ------
FR-BU-30K
------ ------ 260 180 160 130 100 80 70 ------
FR-BU-55K
------ ------ ------ ------ 300 250 180 150 120 100
4
0
0
V
FR-BU-H15K
Braking
Torque
(%)
280 200 120 100 80 70 ------ ------ ------ ------
FR-BU-H30K
------ ------ 260 180 160 130 100 80 70 ------
FR-BU-H55K
------ ------ ------ ------ 300 250 180 150 120 100
Resistor unit
Brake unit
Brake Unit Type Resistor Unit Type
Cable (P/+-P/+, N/--
N/-, P/+-P, PR-PR)
(Note) 1. The temperature rise of the resistor unit is about a
maximum of 100°C. Therefore, use heat-resistant wires
(such as glass wires).
2
0
0
V
FR-BU-15K
FR-BU-30K
FR-BU-55K
FR-BR-15K
FR-BR-30K
FR-BR-55K
3.5mm
2
5.5mm
2
14mm
2
4
0
0
V
FR-BU-H15K
FR-BU-H30K
FR-BU-H55K
FR-BR-H15K
FR-BR-H30K
FR-BR-H55K
3.5mm
2
3.5mm
2
5.5mm
2
Use the wires of the above recommended size or larger.
Within
5m
Inverter
*3
PRN/-
P/+ P/+ P
FR-BU
FR-BR
PR
Within
5m
P/+
N/-
Within 10m
Twist Twist
Inverter
PRN/-
P/+ P/+ P
FR-BU
FR-BR
PR
Within 10m
*3. Minimize the cable length between the inverter and brake
unit and the resistor unit and brake unit. Use a twisted
cable when the wiring length exceeds 5m. (If twisted
wires are used, the distance should be within 10m.) Use
the wires of the above recommended size or larger.
P/+
N/-
U
V
W
P/+
N/−
R/L1
S/L2
T/L3
Motor
IM
Inverter
PR
N/−
P/+
P
HA
HB
HC
FR-BU
FR-BR
TH2
TH1
PR
ON
MC
OFF
T
*2
*1
Three-phase AC
power supply
MCCB
M
C
MC
*3
5m or less