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5
Setting parameters
80
Festo – GDCP-CMMP-M3/-M0-C-CO-EN – 1510b – English
5.3
Conversion factors (factor group)
Overview
Motor controllers are used in a number of applications: as direct drive, with following gear, for linear
drive, etc. To permit easy parametrisation, the motor controller can be parametrised with the help of
the factor group so that the user can specify or read out all variables, such as speed, directly in the
desired units at the output (e.g. with a linear axis position value in millimetres and speeds in milli
metres per second). The motor controller then uses the factor group to calculate the entries in its
internal units of measurement. For each physical variable, (position, speed and acceleration), there is a
conversion factor available to adapt the user units to the own application. The units set through the
factor group are generally designated position_units, speed_units or acceleration_units. The following
sketch illustrates the function of the factor group:
Position Factor
Item
Factor group
User units
Internal controller
units
Position units
Velocity units
±1
position_polarity_flag
Acceleration units
±1
Velocity factor
Speed
±1
velocity_polarity_flag
±1
Acceleration factor
Acceleration
Increments (Inc.)
1Revolution
4096 min
1Revolution
ń
min
256 sec
Fig. 5.2
Factor group
All parameters are stored in the motor controller in its internal units and only converted with the help of
the factor group when being written in or read out.
For that reason, the factor group should be set before the first parameter setting and not changed dur
ing parameter setting.
The factor group is set to the following units by default:
Size
Measurement file
Unit
Explanation
Length
Position units
Increments
65536 increments per revolution
Speed
Velocity units
min
-1
Revolutions per minute
Acceleration
Acceleration units
(min
-1
)/s
Rotational speed increase per second
Tab. 5.3
Factor group default settings