External Dynamic Brake - Mitsubishi Electric MELSERVO-J3 Series Instruction Manual

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14. OPTIONS AND AUXILIARY EQUIPMENT

14.6 External dynamic brake

(1) Selection of external 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 CN6-14, CN6-15, and CN6-16 pins in parameter No.PD09, PD10 or PD11.

Servo amplifier

For the MR-J3-11KT(4) to MR-J3-22KT(4) servo amplifiers, use an external

dynamic brake. When not using the external dynamic brake, the servo motor will

not stop immediately but coasts, and this may cause an accident. Ensure the

safety in the entire equipment.

Configure a sequence which switches off the magnetic contactor of the

external dynamic brake after (or as soon as) the servo-on (RYn0) has been

turned off at a power failure or a malfunction.

For the braking time taken when the external dynamic brake is operated, refer

to section 13.3.

The external dynamic brake is rated for a short duration. Do not use it for high

When using the 400V class dynamic brake, the power supply voltage is

restricted to 1-phase 380VAC to 463VAC (50Hz/60Hz).

Dynamic brake operates at occurrence of alarm, servo forced stop warning

(AE6), and when the power is turned off. The dynamic brake is an emergency

stop-use function, so do not use it for normal stop.

For a machine operating at the recommended load to motor inertia ratio or

less, the estimated number of usage times of the dynamic brake is 1000

times while the machine decelerates from the rated speed to a stop once in

Be sure to enable Forced stop (EMG) after the servo motor stops when using

Forced stop (EMG) frequently in other than emergency.

External dynamic brake

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