Yaskawa SGDB - Manual (Page 301)

5.3 SERVOPACK Ratings and Specifications
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5.3.6 Overhanging Loads
A servomotor may not be operated under an overhanging load, that is a load which tends
to continually rotate the motor.
• Overhanging Load Example 1: Motor drive for vertical axis, using no counterweight
Motor
• Overhanging Load Example 2: Tension control drive
Tension
Motor subject to rotation from feed motor
to maintain applied tension.
Motor
NOTE Under an overhanging load (e.g. when the direction of the torque applied by the motor is op-
posite from the direction of shaft rotation), the SERVOPACK regenerative brake is applied
continuously and the regenerative energy of the load may exceed the allowable range and
damage the SERVOPACK.
The regenerative brake capacity of the SGDB SERVOPACK is rated for short-time operation,
approximately equivalent to the deceleration stopping time.
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