Bu2-(H) Brake Unit; Selection - Mitsubishi Electric MELSERVO-J2S Series Transition Handbook

Part 5: Review on Replacement of MR-J2S-30 kW or Higher Capacity Models with MR-J4-DU_
5.4 FR-BU2-(H) Brake Unit
Connect a brake unit to the buses of a converter unit (between L+ and L- of TE2-1). Brake units regenerate
larger power than MR-RB regenerative options. Brake units are used when there is insufficient regenerative
ability in regenerative options.
When using a brake unit, make sure to refer to the "FR-BU2 Instruction Manual".

5.4.1 Selection

Use a converter unit, a brake unit, and a resistor unit in the combination described in the table below.
Brake unit
200 V class FR-BU2-55K
FR-BU2-H55K
400 V class
FR-BU2-H75K
POINT
In torque control mode, EM2 signals of a drive unit are the same as its EM1
signals.
Use a 200 V class brake unit and resistor unit for a 200 V class converter unit as
well as a 400 V class brake unit and resistor unit for a 400 V class converter
unit. Do not use different voltage class units together.
Do not install a brake unit or resistor unit horizontally or obliquely, otherwise
their heat dissipation effect will deteriorate. Make sure to install them vertically.
The temperature of resistor unit case rises up to 100 °C or more. Make sure that
any wires or flammables do not come in contact with the case.
Use a brake unit in ambient temperature of -10 to 50 °C. Note that the ambient
temperature for brake units is different from that for converter units (0 to 55 °C).
Configure the circuit in such a way that when a malfunction occurs, the power
supply is shut off by using an alarm output from a brake unit or resistor unit.
Use a brake unit in combination with other units as described in Section 5.4.1.
A brake unit and a regenerative option (regenerative resistors) cannot be used
together.
When using a brake unit, set parameters as described in the table below.
Parameter
[Pr. PA01] of converter units
[Pr. PA02] of drive units
Resistor unit
FR-BR-55K
MT-BR5-55K
FR-BR-H55K
MT-BR5-H75K
Permissible
Number of
continuous
connected
power
units
[kW]
2 (in parallel) 7.82
2 (in parallel) 11.0
2 (in parallel) 7.82
2 (in parallel) 15.0
5 - 39
Setting value
_ _ 0 0 (initial value)
_ _ 0 1
Resultant
resistance
Converter unit
[Ω]
1
MR-CR55K
1
4
MR-CR55K4
3.25