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11. OPTIONS AND PERIPHERAL EQUIPMENT
11 - 24
11.3 FR-BU2-(H) brake unit
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.
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 Resistor unit
Number of
connected
units
Permissible
continuous
power [kW]
Resultant
resistance [Ω]
Applicable servo
amplifier (Note 3)
200 V
class
FR-BU2-15K FR-BR-15K 1 0.99 8 MR-J4-500B(-RJ)
(Note 1)
2 (parallel) 1.98 4 MR-J4-500B(-RJ)
MR-J4-700B(-RJ)
MR-J4-11KB(-RJ)
MR-J4-15KB(-RJ)
FR-BU2-30K FR-BR-30K 1 1.99 4 MR-J4-500B(-RJ)
MR-J4-700B(-RJ)
MR-J4-11KB(-RJ)
MR-J4-15KB(-RJ)
FR-BU2-55K FR-BR-55K 1 3.91 2 MR-J4-11KB(-RJ)
MR-J4-15KB(-RJ)
MR-J4-22KB(-RJ)
MT-BR5-55K 1 5.5 2 MR-J4-22KB(-RJ)