Yaskawa Large Capacity Sigma II Series - Manual (Page 293)

7.3 SERVOPACK Ratings and Specifications
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* 3. Speed regulation is defined as follows:
The motor speed may change due to voltage variations or amplifier drift and changes in pro-
cessing resistance due to temperature variation. The ratio of speed changes to the rated speed
represent speed regulation due to voltage and temperature variations.
* 4. Forward is clockwise viewed from the non-load side of the servomotor. (Counterclockwise
viewed from the load and shaft end.)
* 5. The built-in open collector power supply is not electrically insulated from the control circuit
in the SERVOPACK.
Speed regulation =
Rated motor speed
× 100%
No-load motor speed - Total load motor speed