Baldor NXE100-1608Dx, Installation Manual

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Operation 5-17 MN1941
5.5.4 Selecting a scale
Mint defines all positional and speed related motion keywords in terms of encoder quadrature
counts (for servo motors) or steps for stepper motors. The number of quadrature counts (or
steps) is divided by the
SCALEFACTOR
allowing you to use units more suitable for your
application. The unit defined by setting a value for SCALEFACTOR is called the user unit (uu).
Consider a servo motor with a 1000 line encoder. This provides 4000 quadrature counts for each
revolution. If
SCALEFACTOR is not set, a Mint command that involves distance, speed, or
acceleration may need to use a large number to specify a significant move. For example
MOVER(0)=16000
(Move Relative) would rotate the motor by 16000 quadrature counts - only
four revolutions. By setting a
SCALEFACTOR
of 4000, the user unit becomes revolutions. The
more understandable command MOVER(0)=4 could now be used to move the motor four
revolutions.
The same concept applies to stepper motors, where the scale can be set according to the
number of steps per revolution. Typically, this would be 200 for a motor with a 1.8° step angle, or
400 if driven in half step mode. By setting a
SCALEFACTOR of 200 (or 400 if driven in half step
mode), the user unit becomes revolutions. In applications involving linear motion a suitable value
for
SCALEFACTOR
would allow commands to express values in linear distance, for example
millimeters, inches or feet.
When setting a
SCALEFACTOR
for a remote axis, the value is not sent to the remote axis. The
scale factor operates for commands and programs running on the NextMove e 100, and should
be appropriate for the remote axis’ motor feedback device. The actual positional data transmitted
between the NextMove
e 100 and the remote axis is converted into ‘raw’ encoder counts. This
means that no matter what SCALEFACTOR has been set on the remote axis (if at all), positional
commands sent by the NextMove e 100 are always received and interpreted correctly by the
remote axis.
1. In the Toolbox, click the Parameters icon.
2. In the parameters tree, scroll to the entry
for the chosen axis. This is found in the
Axis/Channel/Bank folder, under the Axis
sub heading.
3. The adjacent table will list the parameters
for the chosen axis.
Scroll to the entry for ScaleFactor.