User guide

50 www.controltechniques.com SM-EZMotion Module User Guide
This selection sets the real-time velocity time scale.
Decimal Places
The number of decimal places defined in this parameter
determines the max resolution of all real-time velocity
parameters found throughout the PowerTools Pro
software. Set between 0 and 6 decimal places. Higher
number of decimal places allows higher velocity resolution,
but can limit the max speed allowed by the application.
Acceleration
Time Scale List Box
From this list box, select the acceleration time scale to be
used for all real-time profiles. The time scale selected will
be used for both acceleration and deceleration
parameters. You can select from milliseconds or seconds.
Decimal Places
The number of decimal places defined in this parameter
determines the max resolution of all real-time acceleration
and deceleration parameters found throughout the
software. Set between 0 and 6 decimal places.
7.3.3 Master Units Setup View
The Master Units Setup view is used to configure the
parameters for the master axis used in synchronized
motion applications. The master axis is most often a
second encoder, or possibly another upstream drive.
Figure 71 shows an example of the Master Units Setup
view.
7.3.3.1 Feedback Setup
Select from Drive, Slot 1, Slot 2 or Slot 3. If Drive is
selected, then that means that the motor feedback must be
routed to one of the option module slots.
Figure 71: Master Setup View
7.3.3.1.1 Master Position Source
Master Feedback Source indicates the hardware location
of the master encoder input.
7.3.3.2 Master Position Setup
7.3.3.2.1 Define Home Position
Define Home Position is the value that the Master Position
Feedback will be set to when the MasterAxis.DefineHome
destination is activated. After the MasterAxis.DefineHome
has been activated, the MasterAxis.AbsolutePosnValid
source will activate.
7.3.3.2.2 Rotary Rollover Check Box
When selected, the rotary rollover feature for the Master
Axis will be enabled.
7.3.3.2.3 Rotary Rollover
If enabled, the Master Position will rollover to zero at the
value specified here. As the master encoder counts up, the
master position feedback will increase until it reaches the
Rotary Rollover value and then reset to zero and continue
to count up. If rotating in the negative direction, the master
position feedback will decrease until it reaches zero, and
then start over at the Rotary Rollover value.
7.3.3.3 Master Distance Units
The parameters in this group are used to establish the
scaling of the master axis into user units.
7.3.3.3.1 Units Name
This is a text string up to 12 characters that will be used to
define the units of distance traveled by the master axis for
incoming synchronization signals.
7.3.3.3.2 Decimal Places
The number of decimal places set in this parameter
determines the number of digits after the decimal point
used in all distance and position parameters used in
synchronized motion throughout the software. Using a high
number of decimal places will improve position resolution,
but will also limit the maximum position. You can select
from zero to six decimal places of programming resolution.
7.3.3.3.3 Master Distance Units Scaling
The scaling factor is defined as following:
The numerator (top value of the scaling fraction) is the
Characteristic Distance. The Characteristic Distance is the
number of Master Distance Units that will be traveled per
number of revs defined in the bottom value of the fraction.
The denominator (bottom value of the scaling fraction) is
the # of encoder revolutions. The master revs parameter is
the number of incoming whole revolutions it takes to travel
the specified characteristic distance.
Scaling
MasterDistUnitsCharacteristicDis c
e
tan
MasterDistUnitsEncoderRevs
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