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15. SERVO AMPLIFIERS WITH A LARGE CAPACITY
(
30k TO 55kW
)
15.9.10 FR-BU2-(H) brake unit
POINT
Use a 200V class brake unit and a resistor unit with a 200V class converter unit,
and a 400V class brake unit and a resistor unit with a 400V class converter unit.
Combination of different voltage class units cannot be used.
Install a brake unit and a resistor unit on a flat surface vertically. When the unit is
installed horizontally or diagonally, the heat dissipation effect diminishes.
Temperature of the resistor unit case rises to higher than 100 . Keep cables
and flammable materials away from the case.
Ambient temperature condition of the brake unit is between 10 (14 ) to 50
(122
). Note that the condition is different from the ambient temperature
condition of the converter unit (between 0
(32 ) to 55 (131 )).
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 (1) in this section.
For executing a continuous regenerative operation, use FR-RC-(H) power
regenerative converter or FR-CV-(H) power regenerative common converter.
When using the brake unit, set the parameters as shown below.
Setting value
Parameter No.PA01 of the MR-J3-CR55K(4) converter unit 00 (Initial value)
Parameter No.PA02 of the drive unit 00 (Initial value)
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, make sure to refer to the FR-BU2-(H) Brake Unit Instruction Manual.
(1) Selection
Use a combination of converter unit, brake unit and resistor unit listed below.
Brake unit Resistor unit
Number of
connected
units
Permissible
continuous
power [kW]
Total
resistance
[
]
Applicable converter
unit
200V
class
FR-BU2-55K FR-BR-55K 2 (parallel) 7.82 1 MR-J3-CR55K
MT-BR5-55K 2 (parallel) 11.0 1 MR-J3-CR55K
400V
class
FR-BU2-H55K FR-BR-H55K 2 (parallel) 7.82 4 MR-J3-CR55K4
FR-BU2-H75K MT-BR5-H75K 2 (parallel) 15.0 3.25 MR-J3-CR55K4