Instruction manual

11 - 43
11. OPTIONS AND AUXILIARY EQUIPMENT
11.6 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. Assign the dynamic brake interlock
(DB) to any of CN3-9, CN3-13, and CN3-15 pins in parameter No.PD07 to PD09.
Servo amplifier Dynamic brake
MR-J3-11KB DBU-11K
MR-J3-15KB DBU-15K
MR-J3-22KB DBU-22K
MR-J3-11KB4 DBU-11K-4
MR-J3-15KB4
MR-J3-22KB4
DBU-22K-4
(2) Connection example
MC
NFB
MC
L
11
L
21
U
V
W
U
V
W
E
M
13 U14 V W
External dynamic brake
a
b
Servo amplifier
Servo motor
SK
MC
ON
OFF
(Note1)
Operation-ready
RA1
EM1
EM1
CN3
20
3
Plate
EM1
DOCOM
SD
L
3
L
2
L
1
Power supply
3-phase
200 to
230VAC
or 3-phase
380 to
480VAC
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.
3: For the servo amplifiers from 11k to 22kW, be sure to connect P - P
1
. (Factory-wired)
When using the power factor DC reactor, refer to Section 11.13.
4: Assign the dynamic brake sequence (DB) in the parameters No.PD07 to PD09.
5: For 400VAC class, a step-down transformer is required.
RA1
DB
CN3
3
10
DOCOM
DICOM
24VDC
(Note 4)
P
P
1
(Note 3)
(Note)
(Note2)