EtherNet/IP – Communication profiles 169
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 23 ODVA SPEED SCALE for
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
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 = ODVA Speed Actual
Dfa = Drive Frequency Actual in Hz
Us = ODVA Speed Unit (see 23 ODVA SPEED SCALE on page 125)
Mf = Motor Nominal Frequency in Hz
Mss = Motor Synchronous Speed in rpm (not Motor Nominal Speed).
UsM
×
×
900
1rpm60Hz
1800rpm30Hz
UsMf
MssDfa
Osa =
×
×
×
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