EtherNet/IP – Communication profiles 163
Speed Reference (AC/DC drive object)
This attribute is the speed reference for the drive. The units are
scaled by the Speed Scale 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 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:
Dfr = Drive Frequency Reference in Hz
Osr = ODVA Speed Reference
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).
Mss
××
Hz30
rpm1800
Hz60rpm1900
Mss
Mf UsOsr
Dfr =
××
××
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