Mitsubishi Electric Melservo JE Series Instruction Manual page 210

10. CHARACTERISTICS
10.3 Dynamic brake characteristics
CAUTION
The coasting distance is a theoretically calculated value which ignores the
running load such as friction. The calculated value will be longer than the actual
distance. If an enough braking distance is not provided, a moving part may crash
into the stroke end, which is very dangerous. Install the anti-crash mechanism
such as an air brake or an electric/mechanical stopper such as a shock absorber
to reduce the shock of moving parts.
POINT
Do not use dynamic brake for stop in a normal operation as it is the function for
stop in emergency.
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 10 minutes.
Be sure to enable EM1 (Forced stop 1) after servo motor stops when using EM1
(Forced stop 1) frequently in other than emergency.
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