Shihlin electric SDP Series, Manual

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12.2 Overload protection feature
Overload protection is to prevent the servo motor from operating under overload conditions.
The Causes of overload are as follows:
(1)
The inertia ratio is too large.
(2)
Acceleration /deceleration time which cannot be reached theoretically is set when loaded.
(3)
The motor operating torque exceeds the rated range and the operating time is too long.
(4)
Large servo gain setting causes resonance in the motor and yet the motor keeps running.
(5)
Incorrect wiring of the power and encoder cables.
If the operating servo motor may exceed the rated torque during operation, you can refer to the
chart of Load and Operating Time as follows:
When the load reaches 300%, the operation time is 2.46 seconds.