82 Communication profiles
For example, for an ODVA Speed Reference of 900 rpm with a unit
of 0.5 rpm, the drive speed reference is:
Torque Reference (AC/DC drive object)
This attribute is the torque reference for the drive. The units are
scaled by the Torque Scale attribute of the AC/DC drive object.
See Table 5. for details.
The adapter module provides the drive with a Torque Reference in
percent of the motor nominal torque. The ODVA AC/DC drive
profile uses Newton-meter (N·m) units for the Torque Reference.
The drive torque reference is calculated as follows:
where
For example, for a 1000 Nm motor nominal torque with a unit of 1
Nm and an ODVA Torque Reference of 500, the drive torque
reference is:
Dtr = Drive torque reference in percent of motor nominal torque
Otr = ODVA Torque Reference
Ut = ODVA torque unit (see 11 ODVA TORQUE SCALE on page 42)
Mt = Motor nominal torque in Nm.
450rpm 0.5rpm 900 UsOsr Dsr
=
Mt
N
1000
Mt
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