Lenze ETC Motion Control Manual do Utilizador descarregar pdf (Página 196)

Machine constants

Software configuration

MK_LAH_GRENZWINKEL

4.3

4.3.9

196

EDSTCXN EN 2.0

4.3.9 MK_LAH_GRENZWINKEL

This machine constant limits the Look Ahead function (G60) to a defined

angle range. During this process, the system switches automatically to exact

positioning on non−tangential block transitions, on which the transition

angle is larger than the value of this MC.

This is to ensure that these corners in the profile can be precisely approached

even when Look Ahead is switched on by forcing the speed on the corner

down to 0.

The speed on the block transitions on which the transition angle is less the

value of this MC, is not reduced to 0 but only as defined in

MK_KONTURFEHLER.

Value Meaning

0 If there is even a slight change of direction, this will lead to a standstill at the block

transition.

15 Only a change of direction in excess of 15° will lead to a standstill.

45 Only a change of direction in excess of 45° lead to a standstill (default).

180 Special case: no speed reduction at block transitions.

Permitted values for this MC range between 0 and 180°. Please bear in mind

that the special case 180° may lead to acceleration jumps at the block

transitions and thus to incorrect SW limit switch messages in the look−ahead

SW limit switch function (MK_SW_ENDS_MIT_RAMPE = 2).

4.3.10 MK_RADIUS_B_BEWERTUNG

This machine constant is a factor, which can be used to affect the maximum

traversing speed when machining curves. The control limits the speed when

machining circles depending on the circle radius and the permissible path

speed per time unit (jerk) as follows:

K/TB

⋅⋅

max

max:

max. speed on the circular arc [mm/s]

R: radius of the circular arc [mm]

B: Set path acceleration (MK_BAHNBESCHL, G201) [mm/s

]

T: time constant for the permissible acceleration increase

(MK_T_BAHNBESCHL) [s]

K: Value of MK_RADIUS_B_BEWERTUNG

This MC is thus an evaluation factor for the permissible jerk on circular arcs.

It can be used to correct the speed limit for small radii upwards or

downwards.

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ama 11 Jan 2025 | 19:35:39

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Lenze ETC Motion Control Manual do Utilizador Página 196

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