Parker AC30 Série Mode D'emploi page 410

D-124
Parameter Reference
Functional Description
By definition, the motor Vector Control is based on the assumption that the back EMF is crossing the 0V line in a positive direction when the
electrical position is also crossing the 0° line in a positive way. Another requirement is to insure a positive 'encoder/resolver' rotation with a positive
electrical motor rotation ( U, V, W ).
AC30 series Variable Speed Drive