Rockwell Automation 20-COMM-K CANopen Adapter User Manual
Page 49
Using I/O Messaging
5-7
20-COMM-K CANopen Adapter User Manual
Publication 20COMM-UM012B-EN-P
(Parameter 82 / Parameter 55) * 32767 = Scaling
Using parameter 82 and 55 default values, speed Reference scaling is:
(60 Hz / 130 Hz) * 32767 = 15123
Therefore, 0…15123 = 0…60.0 Hz.
If parameter 82 - [Maximum Speed] is changed to 90 Hz, then:
(90 Hz / 130 Hz) * 32767 = 22685
Therefore, 0…22685 = 0…90.0 Hz.
A graphic representation of this Reference scaling is shown below:
For PowerFlex 70 EC drives (firmware v2.xxx or higher) or PowerFlex 700
VC drives (firmware v3.xxx or higher), parameter 298 - [DPI Ref Select]
was added to simplify scaling for the speed Reference. When parameter 298
- [DPI Ref Select] is set to its default “0” (Max Freq), the speed Reference
scaling is as shown above. However, when parameter 298 - [DPI Ref Select]
is set to “1” (Max Speed), the speed Reference scaling is equal to parameter
82 - [Max Speed]:
Parameter 82 = Scaling
Therefore, 0…32767 = 0…60.0 Hz.
If parameter 82 - [Maximum Speed] is changed to 90 Hz, then:
90 Hz = 32767
Speed Feedback uses the same scaling as the speed Reference.
For Reference/Feedback details about other DPI drives, refer to their
respective User Manuals.
0
0 Hz
P
ar
. 55 - [Maxim
um F
req]
Par. 82 - [Maxim
um Speed]
130 Hz
90 Hz
60 Hz
32767
22685
15123
Scaling = (Parameter 82 / Parameter 55) * 32767
TIP: For PowerFlex 700 VC drives (firmware v3.xxx or higher), Parameter
299 - [DPI Fdbk Select] enables you to select the feedback data coming
from the drive over DPI. The default is “Speed Fdbk” in Hz or RPM
determined by Parameter 079 - [Speed Units]. The data selection for
Parameter 299 is also displayed on the 1st line of the HIM and on
DriveExplorer and DriveExecutive screens in the drive status area of the
screen.