ABB FDNA-01 - Page 81

Communication profiles 81
Scalar mode
When the drive is operating in the scalar mode, the adapter
module provides the drive with a frequency reference. The ODVA
AC/DC drive profile uses rpm units for the Speed Reference. The
drive frequency reference is calculated as follows:
where
For example, for a 4-pole 60 Hz motor (Mss = 1800 rpm) with a
unit of 1 rpm and an ODVA Speed Reference of 900, the drive
frequency reference is:
Vector mode
When the drive is operating in the vector mode, the adapter
module provides the drive with a speed reference. The ODVA
AC/DC drive profile uses rpm units for the speed reference. The
drive speed reference is calculated as follows:
where
Dfr = Drive frequency reference in Hz
Osr = ODVA Speed Reference
Us = ODVA speed unit (see 10 ODVA SPEED SCALE on page 41)
Mf = Motor nominal frequency in Hz
Mss = Motor synchronous speed in rpm (not motor nominal speed)
Dsr = Drive Speed Reference in rpm
Osr = ODVA Speed Reference
Us = ODVA speed unit (see 10 ODVA SPEED SCALE on page 41)
Mss
Mf UsOsr
Dfr
×
×
=
Hz30
rpm1800
Hz60rpm1900
Mss
Mf UsOsr
Dfr =
×
×
=
×
×
=
UsOsr Dsr
×
=