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12. OPTIONS AND AUXILIARY EQUIPMENT
12.6 External dynamic brake
CAUTION
Use an external dynamic brake for a servo amplifier of MR-J3-11KA(4) to MR-J3-
22KA(4). Failure to do so will cause an accident because the servo motor does not
stop immediately but coasts at an emergency stop and such conditions.Ensure the
safety in the entire system.
POINT
Configure up a sequence which switches off the magnetic contactor of the brake
unit after (or as soon as) the servo on (SON) has been turned off at a power
failure or failure.
For the braking time taken when the dynamic brake is operated, refer to section
11.3.
The brake unit is rated for a short duration. Do not use it for high duty.
When using the 400V class dynamic brake, the power supply voltage is restricted
to 1-phase 380 to 463VAC (50Hz/60Hz).
Dynamic brake operates at occurrence of alarm, servo emergency stop warning
(AL.E6), and when power is turned off. Do not use dynamic brake to stop in a
normal operation as it is the function to stop in emergency.
Maximum usage time of dynamic brake for a machine operating under
recommended load inertia moment ratio is 1000 time while decelerating from
rated speed to a stop with frequency of once in 10 minutes.
Be sure to make emergency stop (EMG) valid after servo motor stops when using
emergency stop (EMG) frequently in other than emergency.
(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. Assign the dynamic brake interlock (DB) to any of
CN1-22 to CN1-25, and CN1-49 pins in parameter No.PD13 to PD16 and PD18.
Servo amplifier Dynamic brake
MR-J3-11KA DBU-11K
MR-J3-15KA DBU-15K
MR-J3-22KA DBU-22K
MR-J3-11KA4 DBU-11K-4
MR-J3-15KA4
DBU-22K-4
MR-J3-22KA4