346 Rockwell Automation Publication 2198-UM004A-EN-P - October 2019
Chapter 12 Motion Control Applications
The slave axis electronic gear ratio is determined by ID151 (P1.044) and ID152
(P1.045) which is also the electronic gear ratio of the overall servo system. Once
this electronic gear ratio is changed, the motion behavior changes not only in the
E-Cam function, but also in other control modes (PT/PR). Therefore, if you
simply adjust the electronic cam gear ratio, it is not recommended to adjust this
gear ratio parameter.
The master axis electronic gear ratio is dedicated to the electronic cam system
and can change the resolution of the master axis pulse command. The setting
parameters are ID371 (P5.083) ECamSlaveCycleNumberM and ID372 (P5.084)
ECamMasterPulseNumberP. When the slave axis receives the number of master
axis pulses defined by ID372 (P5.084), the electronic cam runs the number of
cycles defined by ID371 (P5.083) (one cycle means the cam curve running from
0…360 degrees).
Figure 173 - E-Cam Gear Ratio
The following example explains the resolution adjustment method of the master
axis. As shown in Figure 174
, the original setting is 10000 master axis pulses for
one cycle. When the ratio becomes larger (ID372 (P5.084) increases or ID371
(P5.083) decreases), the phase interval, which corresponds to one master axis
pulse is narrowed. As a result, the resolution of the master axis pulse command
becomes higher. When the ratio becomes smaller (ID372 (P5.084) decreases or
ID371 (P5.083) increases), the phase interval, which corresponding to one
master axis pulse, is wider. As a result, the resolution of the master axis pulse
command becomes lower. In general, ID371 (P5.083) is set to 1, and ID372
(P5.084) is set to the number of master axis pulses required for one cycle. If the
number of pulses required for one cycle is a number with decimal point, then it is
recommended to adjust the value of ID371 (P5.083) appropriately. For example,
if the number of pulses required to run one cycle is 517.5, then set ID371
(P5.083) = 2, and ID372 (P5.084) = 1035.
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