12 - 15
12. OPTIONS AND AUXILIARY EQUIPMENT
12.1.4 External dynamic brake(1) Selection of dynamic brakeThe dynamic brake is designed to bring the servo motor to a sudden stop when a power failure occursor the protective circuit is activated, and is built in the 7kW or less servo amplifier. Since it is not builtin the 11kW or more servo amplifier, purchase it separately if required. Set " 1 " in the para mete rNo. 2.If the 7kW or less servo amplifier is used but the inertia moment of the load is large, the built-in brakemay not be usable. Refer to Section 11.3 and examine.
Servo amplifier Dynamic brake
MR-J2S-11KB DBU-11K
MR-J2S-15KB DBU-15K
MR-J2S-22KB DBU-22K
(2) Connection example
MC
NFB MC
L11
L21
U
V
W
U
V
W
E
M
13 U14 V W
Dynamic brake
a
b
Servo amplifier
Servo motor
SK
MC
ON
OFF
(Note1)
Operation-ready
RA1
RA1
EM1
EM1
CON2
2
1
Plate
EM1
SG
SD
DB
CON2
15
18
VDD
CO
L3
L2
L1
Power supply
3-phase
200 to
230VAC
4
Note1: Configure up the circuit to switch power off in the external sequence at servo alarm occurrence.
2: Terminals 13, 14 are normally open contact outputs. If the dynamic brake is seized, terminals 13, 14 will open.
Therefore, configure up an external sequence to prevent servo-on.
(Note2)