Operation 5-9MN1903

5.3.3 Selecting a scale
MintMTdefines allpositional and speed related motion keywords in terms of enc oder
quadraturec ounts (for servo motors) or steps for stepper motors. The number of quadratur e
counts (or steps) is divided by the SCALE factor allowing you to use units more suitable for
yourapplic ation. The unit defined by setting a value for scale is called the us er unit (uu).
Consider a motor with a 1000 line encoder. This provides 4000 quadrature counts for each
revolution.If SCALE is not s et, a MintMT command that involves distance, speed, or
acceleration may need to use a large number to specify a significant mov e. For example
MOVER=16000(Move R elative) would rotate the motor by 16000 quadrature counts - only four
revolutions. By setting a SCALE factor of 4000, the user unit becomes revolutions . The more
understandable command MOVER=4 could now be used to move the motor four revolutions.
Inapplications involvinglinear motion a suitable value for SCALE would allow commands t o
express values in linear distance, for example inches, feet or millimetres .
1. In the Toolbox, click Setup, then click
theParameter s icon.
2. Click the Scale tab.
3. Click in the Axis dr op down box to select the
axis. Each axis can have a different scale if
required.
4. Click in the Scale box and t ype a value.
5. Click Apply.
This immediately sets the scaling factor for
the selected axis which will remain in the
NextMove PCI until another scale is defined
orpower is removed from theNextMove PCI.