IMS MicroLYNX Quick Manual page 53

steps to any measure of distance
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such as the current control variables, the I/O variables, etc, only a cursory
mention will be made of them. Otherwise they will be covered in some depth.
M o t o r a n d D r i v e
M U N I T
The "MUNIT" or "motor unit"
variable is a scaling factor
that allows you to scale motor
such as inches, millimeters or
degrees! "User Unit" is a
generic term referring to the
unit of measure scaled to!
36 0 /re v
20 0 ste p s/rev X 25 6 m icros te ps /ste p = 5 1,2 0 0 m icro step s/re v
1 re vo lu tio n = 1 /4(0 .25 ) o f m otio n.
To m o v e th e m oto r 1 w ou ld req uire 4 re vo lu tion s,
O R
4 R e volutio n s
M U N IT
=
In c h
L e a d scre w
A c c e l e r a t i o n , D e c e l e r a t i o n a n d V e l o c i t y
The following variables effect the acceleration, deceleration and velocity of the
driven axis. All of these are effected by the MUNIT variable. The relationship
between these variables is illustrated by figure 10.2.
A C C L
This variable specifies the acceleration of the axis in MUNITs per second squared.
To Read:
To Write:
[ M o t o r U n i t s V a r i a b l e ]
The MUNIT, or Motor Units variable is the conversion factor by
which the user is able to scale motor steps into familiar units of
measurement. By using the MUNIT variable the user can write
motion instructions in inches, millimeters, degrees or whatever
unit of measure applies to the user's application. The example
given below illustrates how the MUNIT variable might be scaled
to inches for a leadscrew with a 0.25" pitch.
1 .8 ste p s = 2 00 ste p s/re v
or 2 04 ,80 0 m ic roste ps
3 .3 16 "
1 .8 ste p pin g m o to r
b e ing d riven by a
M icro LY N X
a t 2 56 re so lutio n .
L e a dscrew h as
1 /4 pitch
1 6 9 7 7 9 .2
M ic ro ste p s
2 0 0 S te p s
2 5 6 m ic ro ste p s
X X
= 2 0 4 80 0
R e vo lu tio n
S te p
LY N X M U N IT
M o to r D rive
Figure 10.1: Setting the MUNIT Variable
[ A c c e l e r a t i o n V a r i a b l e ]
PRINT ACCL
ACCL=75
SETTIN G
TH E M UNIT
VA RIABLE
1 = 4 R e vs or 204 ,80 0 m icro step s
S in ce 0 .25 X 4 is 1 .00
20 4,8 0 0/1.00 = 20 4,80 0
Yo u w o uld enter
M U N IT = 20 4 ,8 00
T h is w o uld se t the sca ling fa cto r to
inc he s in this e xam p le
B y enterin g:
M O V R 3.3 16
S E TT IN G
T h e m otor w o u ld m ove 3.1 36 inche s
51