Bose MR-J2S- B instruction manual Brake unit, Selection, FR-BU-15K, MR-J2S-500B FR-BU-30K, 33.4

No-fuse breaker

NFB

12. OPTIONS AND AUXILIARY EQUIPMENT

12.1.2 Brake unit

POINT

The brake unit and resistor unit of other than 200V class are not applicable to the servo amplifier.

The brake unit and resistor unit of the same capacity must be combined. The units of different capacities may result in damage.

The brake unit and resistor unit must be installed on a vertical surface in the vertical direction. If they are installed in the horizontal direction or on a horizontal surface, a heat dissipation effect reduces.

The temperature of the resistor unit casing rises to higher than 100. Do not cause cables and combustibles to make contact with the casing.

The brake unit is the integration of the regenerative control and resistor and is connected to the bus (across P-N) of the servo amplifier. As compared to the MR-RB regenerative brake option, the brake unit can return larger power. Hence, use the this brake unit when the MR-RB cannot provide sufficient regenerative brake capability.

(1) Selection

Brake unit	Resistor unit	Permissible Continuous	Max. Instantaneous	Applicable Servo Amplifier
		Power [kw]	Current [kw]
FR-BU-15K	FR-BR-15K	0.99	16.5	MR-J2S-500B
FR-BU-30K	FR-BR-30K	1.99	33.4	MR-J2S-700B

(2) Connection example

Servo amplifier

Power supply

3-phase

200 to 230VAC

MC

L1

L2 L3

L11

L21

Servo motor

U

V SM W

(Note 2)
	P				PR
		P/	PR
	C
	N	N/		(Note 1)
				HA
				HB	Alarm
					output
				HC

P

(Note 1) TH1

THS TH2

FR-BU brake unit FR-BR resistor unit

Note 1. Make up the external sequence to switch the power off when an alarm occurs or when the thermal relay is actuated. 2. Always remove the wiring (across P-C) of the servo amplifier built-in resistor.

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