Rockwell Automation 1336E IMPACT Adjustable Frequency AC Drive User Manual V 1-4.XX - Manual (Page 165)

Applications 9-25
Setting the Profile Enable input terminal (TB3-#26) will initialize
the profile control, and set the current motor position as the Home
position. This setting of the Profile Enable bit will be reflected in the
Profile status parameter (P236 bit #5).
Setting the Start input terminal TB3- #19 will start the drive. This is
the same as pressing the green start button on a HIM terminal.
Setting the Run Cycle input terminal TB3- #27 will initiate a Profile
Sequence and will be reflected in the Status parameter P236 bit #6.
When the profile has completed an entire step sequence this input
(Run Sequence #27) will have to be cleared and toggled high
again to begin another sequence.
Input Step Hold
Setting the Step hold input terminal TB3-#28 will prevent the profile
from continuing to the next step. When the hold input is released
(cleared) it will continue to the next state.
Two input terminals, #22 and #23 are available for controlling step
transitions if desired.
Input End Actions
When an input End Action is selected, the profile Control will
command the End Action speed (P239) until the selected TB3 input
goes high. The control will then command zero speed.
An Input End Action is selected by entering a value of 2 in the End
Action parameter #238. The input terminal used to trigger the zero
speed command is selected by parameter #241.
The step trigger inputs are the only valid choices for signaling the end
of the Profile Sequence. Remember, six inputs are available in Mode
#31, but only two inputs are valid in Mode #32.
Encoder Steps Setting a Step Type parameter to a value of 3, defines it as an
Encoder Step.
Adjustable Encoder Step Units
Adjustment of the Counts Per Unit parameter allows you to define
the Units for Encoder Steps in increments that are meaningful for a
particular application.
For Example: An application translates four motor shaft revolutions
via gearing, into one linear foot of movement. The Counts Per Unit
parameter could be adjusted so that the Encoder Step Value
parameters are entered in units equating to one foot.
Encoder Units and the Counts Per Unit Parameter
The rotational distance of each encoder step unit is determined by
Counts Per Unit parameter #245.
When determining the value of the Counts Per Unit parameter, it is
important to understand that a typical encoder produces a value that is
4 times greater than the encoder PPR rating.
This is because the drives are designed to utilize quadrature
encoders. With a quadrature encoder, the counter will increment on
the rising edge of each of the four input signals (A, A, B, B).