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13. OPTIONS AND AUXILIARY EQUIPMENT
13.1.2 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
(212 ). 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.
When using the brake unit, set "01
" in parameter No.0.
(1) Selection
Brake unit Resistor unit
Permissible Continuous
Power [kw]
Max. Instantaneous
Power [kw]
Applicable Servo Amplifier
FR-BU-15K FR-BR-15K 0.99 16.5
FR-BU-30K FR-BR-30K 1.99 33.4
FR-BU-55K FR-BR-55K 3.91 66.8
MR-J2S-500A
MR-J2S-700A
MR-J2S-11KA
MR-J2S-15KA
MR-J2S-22KA
(2) Connection example
MC
NFB
L
1
L
2
L
3
L
11
L
21
C
N
PR
HA
HB
HC
PR
P
TH1
TH2
THS
P
P
1
Power supply
3-phase
200 to 300VAC
No-fuse breaker
Servo amplifer
(Note2)
FR-BU brake unit
Alarm
output
FR-BR resistor unit
(Note3)
(Note1) (Note1)
Note 1. Make up the external sequence to switch the power off when an alarm occurs or when the thermal relay is actuated.
2. When using servo amplifiers of 5kW and 7kW, always remove the lead of built-in regenerative brake resistor connected to P
terminal and C terminal.
3. When using servo ampliflers of 11kw to 22kw, always connect P-P
1
.
(
Factor
y
-wired.
)
When usin
g
the power factor improvin
g
DC reactor,
refer to Section 13.2.4