Festo Электромотор MTR-DCI - Manual (Page 218)

A. Technical appendix
A-14
Festo P.BE-MTR-DCI-DN-EN en 1209a
A.4 Conversion of units of measurement
A measuring system must be defined to allow the electrical
axis parameters to be defined. To allow simple parameterisa-
tion for different application cases, the control panel or FCT
can be used to configure the controller so that the user can
directly enter or read all dimensions in the desired units at
the drive. For example:
– Metric measuring system for linear movements (mm,
mm/s, mm/s
2
)
– Angular measuring system for rotational movements
(degree, degree/s, degree/s
2
) or (rev, rev/s, rev/s
2
)
– Imperial measuring system for linear movements (inch,
inch/s, inch/s
2
)
Every physical value (position, speed, and acceleration) is
converted to the respective measuring system via a
conversion factor.
In the controller, all parameters are always saved in
increment specifications (inc, inc/s, inc/s
2
) and not converted
until they are written or read. For the display, conversion from
the internal basis system into the (pre)set measuring system
takes place within the firmware; for representation on the PC
monitor within the FCT software. In this way, the user does
not need to carry out conversion when entering values or
when reading on the control panel or in the FCT.
Direct transfer of values via the serial interface with CI com-
mands always takes place in the base system and first
requires conversion into increments.
Conversion is carried out via the parameters:
– Feed constant (depending on the axis type)
– Gear reduction ratio
– Encoder resolution = physical measuring steps per motor
revolution. With MTR-DCI: pulse quadruplication by digital
interpolation