|
Type |
EF |
|
Offline editable |
Yes |
|
Devices supporting the parameter |
Lexium LXM52 Drive, Lexium LXM62 Drive, Lexium ILM62 Drive Module, Sercos Drive, Virt. Master Encoder, SinCos Encoder Input Incremental Encoder Input Log. encoder, Encoder network (Synchronization encoder output, Synchronization encoder input) C2C Encoder Input, C2C Encoder Output, LXM62 Safety Module, ILM62 Safety Module |
|
Traceable |
Yes |
Is used to enter the feed constant. The feed constant defines in which units the position information is calculated. As units, for example, millimeters, degrees, and inches can be defined. The defined unit is also used for velocity (Velocity in unit/s) and acceleration (Acceleration in units/s2).
The feed constant is the path (in units) which was covered by one rotation of the drive shaft.
NOTE: Modifications to the parameter are only applied during the Sercos phase up (communication phase 0 => communication phase 4).
Parameters GearIn and GearOut of the drive
oIf a toothed belt covers, for example, 120 mm per drive shaft revolution, then 120 is entered in the FeedConstant. One unit thus is one mm.
oIf a disc covers, for example, 360 degrees per drive shaft revolution, then 360 is entered in the FeedConstant. One unit is one degree.
The following example for an installation shows how the parameters FeedConstant, GearIn, and GearOut are to be defined.
Example installation for the parameters FeedConstant, GearIn, GearOut
The ball screw spindle has a thread pitch of 0.25 inch per drive shaft revolution. The FeedConstant is therefore 0.25 and defines the units as inches.
The units for velocity and acceleration are thus inches/s and inches/s2.
The units for position, velocity, and acceleration are defined by the following parameters:
oFeedConstant = 0.25
oGearIn = 1
oGearOut = 2
The following graphic shows the dependency with other object parameters for rotary drives:
Yellow parameters are input parameters, whose values are taken over by the Sercos phase up. Green parameters are input parameters, whose values are taken over immediately. Gray parameters are output parameters. Thick arrows show that a parameter makes an impact on another parameter immediately by the input. Thin arrows show that a parameter does not have an impact until the next Sercos phase up or when the dependent parameter is entered. The arrow indicates the effective direction of the dependency.
Example:
Entering J_Load has a direct impact on the parameter MaxAcc. A revision of MaxAcc only has an impact on ControllerStopDec if,
oa Sercos phase up takes place or
othe parameter ControllerStopDec is modified.
