11. OPTIONS AND AUXILIARY EQUIPMENT
11 - 14
11.3 FR-BU2 Brake unit
POINT
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.
Temperature of the resistor unit case rises to higher than +100 ÛC. Keep cables
and flammable materials away from the case.
Ambient temperature condition of the brake unit is between -10 ÛC to 50 ÛC.
Note that the condition is different from the ambient temperature condition of the
servo amplifier (between 0 ÛC and 55 ÛC).
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 power
regenerative converter or FR-CV power regenerative 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] of the servo amplifier to "_ _ 0 1".
When using the brake unit, always refer to the FR-BU2-(H) Brake Unit 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 [ȍ]
Applicable servo
amplifier
200 V
class
FR-BU2-15K FR-BR-15K 2 (parallel) 1.98 4 MR-J4-500A
MR-J4-700A
FR-BU2-30K FR-BR-30K 1 1.99 4 MR-J4-500A
MR-J4-700A
11.3.2 Brake unit parameter setting
Whether a parameter can be changed or not is listed below.
Parameter
No. Name
Change
possible/impo
ssible
Remarks
0 Brake mode switchover Impossible Do not change the parameter
1 Monitor display data selection Possible Refer to the FR-BU2-(H) Brake Unit
Instruction Manual.
2 Input terminal function selection 1 Impossible Do not change the parameter
3 Input terminal function selection 2
77 Parameter write selection
78
Cumulative energization time
carrying-over times
CLr Parameter clear
ECL Alarm history clear
C1 For manufacturer setting
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