Path-specific dynamic limit, parameterising channel parameters

If for technological reasons the path velocity Is not permitted to exceed certain limits regardless of the F word programmed, the parameter P-CHAN-00090 can be used to define a maximum value. This may be the case, for example, if a plasma torch should not cut through at excessive velocity in metal machining applications. When activated in the NC program, the path velocity calculated by the CNC is limited.

If for technological reasons the path acceleration Is not permitted to exceed certain limits, the parameter P-CHAN-00002 can be used to define a maximum value. When activated in the NC program, the path acceleration calculated by the CNC is limited.

The parameter P-CHAN-00351 sets the unit for acceleration. The parameter P-CHAN-00350 sets the additional influence of acceleration limitation on circle geometry elements.

Example

Path-specific dynamics limitation

Excerpt from the channel parameter list:

vector.velocity               1500

vector.acceleration           1000

vector.acc_dec_unit           MM_S2

vector.cir_radial_acc_limit   0

The #VECTOR LIMIT ON[ACC... VEL..] commands activate the path-specific dynamic limitation [PROG].

The operating principle of path acceleration limitation can be influenced by keywords in the command. Limitation then acts

• either only on feed blocks
• or only on rapid traverse blocks
• or on both block types.

This does not affect dynamics limitation due to axis-specific limits.

Notice

The use of path-specific limitation functions listed above and depending on the parameter P-CHAN-00097 can result in considerable lengthening of the deceleration distance with feed blocks.

It is therefore recommended to set the P-CHAN-00097 parameter to 1 when the acceleration limitation functions listed above are used.

Example

Excerpt from the channel parameter list:

use_drive_curr_limit        1