Mitsubishi Electric Melservo MR-J3- 350B4, Instruction Manual

Page: 385 / 408

13 - 88
13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
13.9.10 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 °C. Keep
cables and flammable materials away from the case.
Ambient temperature condition of the brake unit is between 10°C to
50°C. Note that the condition is different from the ambient temperature
condition of the converter unit (between 0°C to 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 (1) of this section.
For executing a continuous regenerative operation, use FR-RC-(H) power
regeneration converter or FR-CV-(H) power regeneration common converter.
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 brake option, the brake unit can return larger power. Use the brake unit when the regenerative
brake option cannot provide sufficient regenerative brake capability.
When using the brake unit, set the parameter No.PA02 of the converter unit to “
01”.
When using the brake unit, always 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
FR-BU2-55K FR-BR-55K 2 (parallel) 7.82 1 MR-J3-CR55K 200V
class MT-BR5-55K
2 (parallel) 11.0 1 MR-J3-CR55K
FR-BU2-H55K FR-BR-H55K 2 (parallel) 7.82 4 MR-J3-CR55K4 400V
class FR-BU2-H75K MT-BR5-H75K 2
(parallel) 15.0 3.25 MR-J3-CR55K4