Fr-Bu2-(H) Brake Unit - Mitsubishi Electric MELSERVO-J4 series Instruction Manual

11. Options and peripheral devices

11.3 FR-BU2-(H) brake unit

Connect the brake unit to the bus of the servo amplifier. 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, set [Pr. PA02] to "_ _ 0 1".
When using the brake unit, always refer to the FR-BU2 Instruction Manual.
11.3.1 Selection
Use a combination of servo amplifier, brake unit and resistor unit listed below.
Brake unit
200 V FR-BU2-15K
class
FR-BU2-30K
FR-BU2-55K
POINT
Use a 200 V class brake unit and a resistor unit with a 200 V class servo
amplifier, and a 400 V class brake unit and a resistor unit with a 400 V class
servo amplifier. 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
servo amplifier (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 11.3.1.
For executing a continuous regenerative operation, use FR-RC-(H) power
regeneration converter or FR-CV-(H) power regeneration common converter.
Brake unit and regenerative options (Regenerative resistor) cannot be used
simultaneously.
Resistor unit
FR-BR-15K
FR-BR-30K
FR-BR-55K
MT-BR5-55K
Number of Permissible
connected continuous
units power [kW]
1 0.99
2 (parallel) 1.98
1 1.99
1 3.91
1 5.5
11 - 22
Resultant Applicable servo
resistance [Ω] amplifier (Note 3)
8 MR-J4-500B(-RJ)
(Note 1)
4 MR-J4-500B(-RJ)
MR-J4-700B(-RJ)
MR-J4-11KB(-RJ)
MR-J4-15KB(-RJ)
4 MR-J4-500B(-RJ)
MR-J4-700B(-RJ)
MR-J4-11KB(-RJ)
MR-J4-15KB(-RJ)
2 MR-J4-11KB(-RJ)
MR-J4-15KB(-RJ)
MR-J4-22KB(-RJ)
2 MR-J4-22KB(-RJ)