Baldor NextMove PCI, Installation Manual

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Operation 5-9 MN1903
5.3.3 Selecting a scale
MintMT 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
SCALE
factor allowing you to use units more suitable for
your application. The unit defined by setting a value for scale is called the user unit (uu).
Consider a motor with a 1000 line encoder. This provides 4000 quadrature counts for each
revolution. If
SCALE is not set, a MintMT command that involves distance, speed, or
acceleration may need to use a large number to specify a significant move. For example
MOVER=16000
(Move Relative) 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.
In applications involving linear motion a suitable value for
SCALE
would allow commands to
express values in linear distance, for example inches, feet or millimetres.
1. In the Toolbox, click Setup , then click
the Parameters icon.
2. Click the Scale tab.
3. Click in the Axis drop down box to select the
axis. Each axis can have a different scale if
required.
4. Click in the Scale box and type 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
or power is removed from the NextMove PCI.