YASKAWA SGM-A3 User Manual page 162

2) "When is a Regenerative Unit Required?"
For general use, a generative unit is not required. In the following cases, however, the
user must determine whether a regenerative unit is required or not:
a) When the motor is used to control a vertical axis.
b) When the motor starts and stops frequently.
c) When load inertia exceeds the allowable load inertia on the motor side.
d) When the motor rotates at a speed higher than the rated speed (3000 r/min).
a) When motor controls a vertical axis.
c) When load inertia is too high.
Servomotor
3) "How can we Determine Whether a Regenerative Unit is Required or Not?"
Using software "regenerative capacity check program" enables the user to easily deter-
mine whether a regenerative unit is required. This software is included as part of Yaska-
wa proprietary software "AC servomotor sizing software," which is supplied free of
charge. Use this software as necessary.
b) When motor accelerates and
decelerates frequently.
Servomotor
Speed
d) When motor rotates at a speed higher
Moves than 3000 r/min.
vertically
Operating
speed
Rated speed
3000 r/min
Load inertia > Allowable load inertia for servomotor
Load
inertia
3.8 Special Wiring
Speed reference
Speed reference
Time
149
3