Bu2-(H) Brake Unit; Selection - Mitsubishi Electric MELSERVO-J4 Series Transition Handbook

Part 5: Review on Replacement of MR-J3-DU_ with MR-J4-DU_
7.4 FR-BU2-(H) brake unit
Connect the brake unit to the bus of the converter unit (L+ and L- of TE2-1) for use. As compared to the MR-
RB regenerative option, the brake unit can return larger power. Use the brake unit when the regenerative
option cannot provide sufficient regenerative capability.
When using the brake unit, always refer to "FR-BU2 Brake Unit Instruction Manual".

7.4.1 Selection

Use a combination of converter unit, brake unit and resistor unit listed below.
Brake unit
200 V class FR-BU2-55K
FR-BU2-H55K
400 V class
FR-BU2-H75K
POINT
EM2 of the drive unit is the signal having the same contents as EM1 of the drive
unit in torque control mode. (J4 series)
Use a 200 V class brake unit and a resistor unit with a 200 V class converter
unit, and a 400 V class brake unit and a resistor unit with a 400 V class
converter unit. Combination of different voltage class units cannot be used.
When a brake unit and a resistor unit are installed horizontally or diagonally, the
heat dissipation effect diminishes. Install them on a flat surface vertically.
The temperature of the resistor unit case will be higher than the ambient
temperature by 100 ˚C or over. Keep cables and flammable materials away from
the case.
Ambient temperature condition of the brake unit is between -10 °C and 50 °C.
Note that the condition is different from the ambient temperature condition of the
converter unit (between 0 °C and 55 °C).
Configure the circuit to shut down the power-supply with the alarm output of the
brake unit and the resistor unit under abnormal condition.
Use the brake unit with a combination indicated in section 7.4.1.
Brake unit and regenerative options (Regenerative resistor) cannot be used
simultaneously.
When using the brake unit, set the parameters as follows.
Parameter
[Pr. PA01] of the converter unit
MR-J3-DU_ drive unit of the [Pr. PA02]
MR-J4-DU_ drive unit of the [Pr. PA02]
Resistor unit
FR-BR-55K
MT-BR5-55K
FR-BR-H55K
MT-BR5-H75K
Permissible
Number of
continuous
connected
power
units
[kW]
2 (parallel)
7.82
2 (parallel)
11.0
2 (parallel)
7.82
2 (parallel)
15.0
5 - 57
Setting value
_ _ 0 0
(Initial value)
_ _ 0 0
(Initial value)
_ _ 0 1
Resultant
resistance
Converter unit
[Ω]
1
MR-J3-CR55K
MR-CR55K
1
4 MR-J3-CR55K4
MR-CR55K4
3.25