Resistor Unit; Connection Example - Mitsubishi Electric FR-F700 Manual

Name (type)
Brake unit
FR-BU-(H) K

Resistor unit

FR-BR-(H) K
53
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
%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
200V 5.5K
Inverter
400V 5.5K
2 FR-BU-15K 80
0
- --- --
FR-BU-30K %ED
0
- --- --
V FR-BU-55K
4 80
FR-BU-H15K
0
- --- --
FR-BU-H30K %ED
0
V - --- --
FR-BU-H55K
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
200V 5.5K
Inverter
400V 5.5K
2 280
FR-BU-15K
Braking
0
FR-BU-30K Torque - --- --
0
(%)
- --- --
V FR-BU-55K
4 280
FR-BU-H15K
Braking
0
- --- --
FR-BU-H30K Torque
0
(%)
- --- --
V FR-BU-H55K
Brake unit and resistor unit combinations and used cables
Brake Unit Type Resistor Unit Type
2
FR-BU-15K FR-BR-15K
0
FR-BU-30K FR-BR-30K
0
FR-BU-55K FR-BR-55K
V
4
FR-BU-H15K FR-BR-H15K
0
FR-BU-H30K FR-BR-H30K
0
FR-BU-H55K FR-BR-H55K
V
Use the wires of the above recommended size or larger.

Connection example

MCCB
Three-phase AC
power supply
*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.
Specifications, Structure, etc.
7.5K 11K 15K 18.5K 22K 30K
7.5K 11K 15K 18.5K 22K 30K
40 15 10 --- --- - --- -- - --- --
- --- -- 65 30 25 15 10
- --- -- - --- -- - --- -- 90 60 30
40 15 10 --- --- - --- -- - --- --
- --- -- 65 30 25 15 10
- --- -- - --- -- - --- -- 90 60 30
7.5K 11K 15K 18.5K 22K 30K
7.5K 11K 15K 18.5K 22K 30K
200 120 100 80 70 - --- --
- --- -- 260 180 160 130 100
- --- -- - --- -- - --- -- 300 250 180
200 120 100 80 70 - --- --
- --- -- 260 180 160 130 100
- --- -- - --- -- - --- -- 300 250 180
Cable (P/+-P/+, N/-- (Note) 1. The temperature rise of the resistor unit is about a
N/-, P/+-P, PR-PR)
2
3.5mm
2
5.5mm
2
14mm
2
3.5mm
2
3.5mm
2
5.5mm
ON
T
*2
MC
MC
FR-BR
Motor
R/L1 U
P TH1
S/L2 V
IM
PR
T/L3 W
TH2
Inverter
FR-BU
PR
P/+
*1
N/− N/−
*3
5m or less
37K 45KK 55K
37K 45KK 55K
- --- -- - --- -- - --- --
- --- -- - --- -- - --- --
20 15 10
- --- -- - --- -- - --- --
- --- -- - --- -- - --- --
20 15 10
37K 45KK 55K
37K 45KK 55K
- --- -- - --- -- - --- --
80 70 ------
Resistor unit
150 120 100
- --- -- - --- -- - --- --
80 70 - --- --
150 120 100
maximum of 100°C. Therefore, use heat-resistant wires
(such as glass wires).
*3
Inverter
FR-BU
OFF
P/+
P/+ P/+
N/-
N/- PR
Within Within
5m 5m
Inverter
FR-BU
Twist
P/+ P/+ P/+
N/- N/- PR
HA
Within 10m
HB
HC
*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.
Brake unit
FR-BR
P
PR
FR-BR
Twist
P
PR
Within 10m