Siemens SINUMERIK 840D sl Function Manual page 1315

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Spindle speed limitation with G96, G961

A maximum spindle speed can be specified for the "Constant cutting rate" function:

● In the setting data:

SD43230 $SA_SPIND_MAX_VELO_LIMS (spindle speed limitation for G96/G961)

● In the part program (for the master spindle) with the programming command LIMS

The most recently changed value (LIMS or SD) is active.

LIMS is effective with G96, G961, G97 and can be specified on up to four speed limitations in

the part program in one block. Spindle number <Sn> = 1, 2, 3, or 4 of the master spindle that

is possible in the particular instance can be programmed in part program command LM[<Sn>].

When the block is loaded in the main run, all programmed values are transferred to the setting

data SD43230 $SA_SPIND_MAX_VELO_LIMS.

Depending on the machine data:

MD10710 PROG_SD_RESET_SAVE_TAB[n] (setting data to be updated),

the speed limit set with LIMS remains stored after the control is switched off.

When G96, G961, G97 are reactivated, this speed limitation is also activated.

The maximum permissible spindle speed defined via G26 or via the setting data:

SD43220 $SA_SPIND_MAX_VELO_G26 (maximum spindle speed)

cannot be exceeded.

In the event of incorrect programming that would cause one of the speed limits (G26 or

SD43220 $SA_SPIND_MAX_VELO_G26) to be exceeded, the following interface signal is set.

DB31, ... DBX83.1 (programmed speed too high)

In order to ensure smooth rotation with large part diameters, the spindle speed is not permitted

to fall below a minimum level.

This speed can be set via the setting data:

SD43210 $SA_SPIND_MIN_VELO_G25 (minimum spindle speed)

and, depending on the gear step, with the machine data:

MD35140 $MA_GEAR_STEP_MIN_VELO_LIMIT (minimum speed of the gear step)

The minimum spindle speed can be changed in the part program with G25. In the event of

incorrect programming that would cause one of the speed limits (G25 or SD43210

$SA_SPIND_MIN_VELO_G25) to be undershot, the following interface signal is set.

DB31, ... DBX83.2 (speed setpoint too low)

Basic Functions

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

V1: Feedrates

17.2 Path feedrate F

Sinumerik 828d Sinumerik 840de sl