Mitsubishi Electric Melservo-Jet MR-JET G-N1 Series, User Manual

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5 CHARACTERISTICS
5.3 Dynamic brake characteristics
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5
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 too 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.
• MR-JET compatible servo motors may have a different coasting distance than previous generation servo
motor models.
• The time constant "

" 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 manual.

MR-JET-G User's Manual (Parameters)
Precautions relating to the dynamic brake characteristics
The electronic dynamic brake is set to operate in the initial state for the following servo motors.
Series Servo motor
HG-KNS HG-KNS13/HG-KNS23/HG-KNS43
HG-SNS HG-SNS52