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12. OPTIONS AND AUXILIARY EQUIPMENT
12.1.2 FR-BU2 brake unit
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 "
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
FR-BU2-15K
FR-BU2-30K
FR-BU2-55K
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
and
50
(122 ). Note that the condition is different from the ambient
temperature condition of the servo amplifier (between 0
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.
Resistor unit
FR-BR-15K
FR-BR-30K
FR-BR-55K
MT-BR5-55K
Number of
Permissible
connected
continuous
units
power [kW]
1
0.99
1
1.99
1
3.91
1
5.5
12 - 10
10
(14 )
(32 ) and
01".
Total
Applicable servo
resistance
amplifier
[ ]
8
MR-J2S-350B
MR-J2S-500B
4
MR-J2S-500B
MR-J2S-700B
MR-J2S-11KB
MR-J2S-15KB
2
MR-J2S-11KB
MR-J2S-15KB
MR-J2S-22KB
2
MR-J2S-22KB
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