Speed Actual (Ac/Dc Drive Object) - ABB FENA-01 User Manual

Speed Actual (AC/DC drive object)

This attribute indicates the actual speed at which the drive is
operating. The units are scaled by the SpeedScale attribute of the
AC/DC drive object. See parameter
details.
Scalar mode
When the drive is operating in the scalar mode, the drive provides
the adapter module with a frequency actual. The ODVA AC/DC
drive profile uses rpm units for the speed actual. The ODVA Speed
Actual is calculated as follows:
where
Osa = ODVA Speed Actual
Dfa = Drive Frequency Actual in Hz
Us = ODVA Speed Unit (see
Mf = Motor Nominal Frequency in Hz
Mss = Motor Synchronous Speed in rpm (not Motor Nominal Speed).
For example, for a 4-pole 60 Hz motor (Mss = 1800 rpm) with a
unit of 1 rpm and a Drive Frequency Actual of 30 Hz, the ODVA
Speed Actual is:
Osa
EtherNet/IP – Communication profiles 169
×
Dfa
=
Osa
Mf
23 ODVA SPEED SCALE
×
Dfa Mss 30Hz
= =
×
Mf Us 60Hz
23 ODVA SPEED SCALE
Mss
×
Us
on page 125)
×
1800rpm
=
900
×
1rpm
for