4 Configuration and Wiring
4 - 78
AC Servomotors/Servo Drives 1S-series with Built-in EtherCAT® Communications User’s Manual (I586)
4-5 Adjustment for Large Load Inertia
The applicable Servomotor load inertia is a value to prevent the Servo Drive circuits from damage
during normal operation.
For the use of the Servomotor within the range of applicable load inertia, the precautions for adjustment
and dynamic brake are described below.
Do not use the dynamic brake frequently for deceleration operation because the dynamic brake is
intended for the stop at the time of an error.
Observe the following instructions to prevent wire breakage, smoking and ignition from occurring in the
dynamic brake.
• Do not use Servo ON/OFF to start and stop the Servomotor when it is not necessary.
• Do not use an external drive source to drive the Servomotor. Do not turn ON the power supply during
motor rotation.
• When the Servomotor is stopped by the dynamic brake, allow it to be in a stop state for three minutes
or more before the Servo is turned ON again.
As a guide, the dynamic brake can be used 1,000 times under the following conditions:
Stopping is performed when the Servomotor rotates at the rated speed, the maximum applicable load
inertia is not exceeded, and the dynamic brake is used once every three minutes.
The load applied to the dynamic brake circuit increases in proportion to the load inertia and rotation
speed. An excessive load may cause a failure.
Use the following expression as a guide for determining the operating rotation speed and operating
inertia.
Operating inertia ≤ (Maximum applicable inertia + Servomotor inertia) × -
Servomotor inertia
Refer to 7-13 Dynamic Brake on page 7-46 for how to set the dynamic brake.
Rated rotation speed
2
Operating rotation speed
2
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