MITSUBISHI ELECTRIC Merservo MR-J2S- B - Manual (Page 169)

12 - 10
12. OPTIONS AND AUXILIARY EQUIPMENT
12.1.2 FR-BU2 brake unit
POINT
The brake unit and resistor unit of other than 200V class are not
applicable to the servo amplifier. Combination of different voltage class
units and servo amplifier 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 )
and 50 (122 ). Note that the condition is different from the ambient
temperature condition of the servo amplifier (between 0 (32 ) and
55 (131 )).
Configure the circuit to shut down the power-supply with the alarm
output of the brake unit and 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 power
regeneration converter or FR-CV 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 the parameter No.2 of the servo amplifier to " 01".
When using the brake unit, always refer to the FR-BU2-(H) Brake Unit Instruction Manual.
(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]
Total
resistance
[ ]
Applicable servo
amplifier
FR-BU2-15K FR-BR-15K 1 0.99 8 MR-J2S-350B
MR-J2S-500B
FR-BU2-30K FR-BR-30K 1 1.99 4 MR-J2S-500B
MR-J2S-700B
MR-J2S-11KB
MR-J2S-15KB
FR-BU2-55K FR-BR-55K 1 3.91 2 MR-J2S-11KB
MR-J2S-15KB
MR-J2S-22KB
MT-BR5-55K 1 5.5 2 MR-J2S-22KB