Dynamic Brake Characteristics - Mitsubishi Electric MR-J5 Series User Manual

5.3

Dynamic brake characteristics

• The coasting distance is a theoretically calculated value that does not consider factors such as friction. If the
braking distance is not longer than the calculated value, a moving part may crash into the stroke end. Install
an 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.
• Do not use the dynamic brake to stop in a normal operation as it is the function to 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 the servo motor stops when using EM1 (Forced stop 1)
frequently in situations other than an emergency.
• Servo motors for MR-J5 may have the different coasting distance from that of the previous model.
• The time constant "τ" for the electronic dynamic brake will be shorter than that of the normal dynamic brake.
Therefore, the coasting distance will be shorter than that of a normal dynamic brake. For how to set the
electronic dynamic brake, refer to [Pr. PF06] and [Pr. PF12].
MR-J5-G/MR-J5W-G User's Manual (Parameters)
MR-J5-A User's Manual (Parameters)
Precautions for the dynamic brake characteristics
The electronic dynamic brake operates in the initial state for the HK series servo motors listed below.
• HK-KT series: HK-KT053W/HK-KT13W/HK-KT1M3W/HK-KT13UW/HK-KT23W/HK-KT43W/HK-KT63W/HK-KT23UW/HK-
KT43UW
• HK-ST series: HK-ST52W/ST1024W
5 CHARACTERISTICS
5.3 Dynamic brake characteristics
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