Specifications

Examples and tips
PROGRAMMING MANUAL 230
Revision 5.0
commands that determine the amount of motion are expressed in these user
units. This parameter enables the user to define the most convenient units to
work with. For example, for a moving part that makes a linear motion, you
can prefer mm, or fraction of mm. For a moving part that makes a rotation
motion, you can prefer a degree of angle or its fraction. For more information
on the UNITS axis parameter, see section 3.2.272.
However, the user must be aware that not only the UNITS axis parameter
matters in the conversion between encoder counts and user defined units.
Certain Servo Driver parameters and some characteristics of the mechanical
system are also important. The following sections describe which Servo
Driver parameters are important for this conversion. We also give examples
of how to set those parameters and the UNITS axis parameter, taking the
characteristics of the mechanical system into account.
Conversion between encoder counts and user defined units
Two very important parameters of the Servo Drivers for conversion of
encoder counts into user units are the electronic gear ratio numerator and
the electronic gear ratio denominator. The table below gives these
parameters for the Servo Drivers.
/i
If a servo motor with an absolute encoder is used, setting parameter Pn205
(Multiturn limit for Sigma-II) is also necessary.
Servo Driver Numerator Denominator
Sigma-II Pn202 Pn203
Sigma-V Pn20E Pn210
Junma Pn20E Pn210
G-Series Pn205 PN206
Accurax G5 Pn009 PN010
Note
The remainder of this section uses the parameters of the Sigma-II
Servo Driver, that is, Pn202 and Pn203. If you use a different
Servo Driver, you must use the corresponding parameters.