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12. OPTIONS AND AUXILIARY EQUIPMENT
12.1.4 External dynamic brake
(1) Selection of dynamic brake
The dynamic brake is designed to bring the servo motor to a sudden stop when a power failure occurs
or the protective circuit is activated, and is built in the 7kW or less servo amplifier. Since it is not built
in the 11kW or more servo amplifier, purchase it separately if required. Set "
1
" in the parameter
No. 2.
If the 7kW or less servo amplifier is used but the inertia moment of the load is large, the built-in brake
may 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
L
11
L
21
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
L
3
L
2
L
1
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)