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PTO counts to motor encoder counts. The error is very small (a few encoder counts per move) and is
repeatable, but this may not be acceptable for all applications.
For the Simple Motion Control CCBB, the Encoder Resolution is set to 131072 [counts/rev] for TL motors
and the Maximum PTO Frequency is set to 100kHz for the MicroLogix 1400. The Maximum Application
Speed is defaulted to 5000 RPM to use the full speed range of the TL motors. This means that the only value
that can be varied to adjust the Gear Ratio is the Maximum Application Speed.
The Maximum Application Speed can be varied from 0 RPM to 5000 RPM for TL motors. As the Maximum
Application Speed value is decreased, the error decreases slightly. However, the trade-off is that your Simple
Motion Control move and jog speeds will now be limited to this new Max Application Speed [RPM].
Therefore, this is not an option for higher speed applications. For slower speed applications that require a
higher degree of precision, the Gear Ratio error could be reduced by lowering your Maximum Application
Speed to better reflect your application speed range rather than using the default 5000 RPM.
To change the Maximum Application Speed & Gear Ratio values, perform the following steps.
It is recommended that the default Simple Motion Control Gear Ratio value and related values be used as
IMPORTANT
specified in
alter the Gear Ratio, note that failure to complete this process completely and correctly could result in
unexpected Gear Ratio translations and therefore unexpected motion.
1. While offline with the PLC, enter your Maximum Application Speed in RPM (0...5000 RPM for TL
motors) in the AX1_MAX_APP_SPEED tag (L250:1).
2. Download the updated PLC program and place the PLC into RUN mode.
3. Note the new value in the AX1_GR_FOLLOWER_CNTS tag (L250:4).
The value used to be 109 but should now reflect your newly calculated Gear Ratio for this particular
axis. This new value will be referred to as XXX.
4. Enter this Gear Ratio value (1:XXX) in the Ultraware setup as shown in the
Follower Parameters
Publication CC-QS008B-EN-P - December 2009
Chapter
1. Only in rare applications will this procedure be needed. If it is deemed necessary to
section in
Chapter
1.
Control Program Integration
Chapter 3
Configure the Drive
45
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