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

5.3

Dynamic brake characteristics

• The coasting distance is a theoretically calculated value that does not consider the running load such as
friction. Since the coasting distance changes depending on the load moment of inertia, perform a test
operation to check the actual braking distance. If the braking distance is long, 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.
• The dynamic brake is a function used to stop in an emergency and should not be used to stop during normal
operations.
• For a machine operating at the recommended load to motor inertia ratio or less, the dynamic brake can be
used approximately 1000 times if the dynamic brake is used to stop the motor from the rated speed once
every 10 minutes.
• If using EM1 (Forced stop 1) frequently in non-emergency situations, enable EM1 (Forced stop 1) after the
servo motor has come to a complete stop.
• 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] in the following manuals.
MR-J5-G/MR-J5W-G User's Manual (Parameters)
MR-J5-B/MR-J5W-B User's Manual (Parameters)
MR-J5-A User's Manual (Parameters)
Precautions related to the dynamic brake characteristics
The electronic dynamic brake operates in the initial state for the HK series servo motors listed below.
Series Servo motor
HK-KT HK-KT053W/HK-KT13W/HK-KT1M3W/HK-KT13UW/HK-KT23W/HK-KT43W/HK-KT63W/HK-KT23UW/HK-KT43UW
HK-ST HK-ST52W/HK-ST1024W
HK-MT HK-MT053W/HK-MT13W/HK-MT1M3W/HK-MT23W/HK-MT43W/HK-MT053VW/HK-MT13VW/HK-MT1M3VW/HK-MT23VW/HK-
MT43VW
5 CHARACTERISTICS
5.3 Dynamic brake characteristics
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