Entering The Deviation From Synchronism Directly; Synchronism Correction - Siemens SINUMERIK 840D Function Manual

Mc axes and spindles

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M3: Coupled axes

14.5 Generic coupling

$AA_COUP_CORR[S<n>] (following spindle: correction value for synchronous spindle

You must ensure that the velocity of the leading and following axes is kept as constant as

possible and that no acceleration jump occurs for the duration of the measurement.

When the coupling of the synchronous spindle [S2] is activated, a position offset of 77 degrees

is also programmed:

CPON=S2 ... CPFPOS[S2]=AC(77)

When the workpiece receptacle is closed, this results in a mechanical position offset, which

leads to an actual-value position offset of 81 degrees.

When the "track the deviation from synchronism" function is activated (DB31, ... DBX31.6 = 1)

and setpoint synchronism has been achieved (DB31, ... DBX99.4 = 0), the actual-value position

offset ($VA_COUP_OFFS[S2] = 81) is compared with the setpoint position offset

($AA_COUP_OFFS[S2] = 77). This results in a correction value of 4 degrees, which is saved

in system variable $AA_COUP_CORR[S2].

Entering the deviation from synchronism directly

If the deviation value is known, it can be written directly to the system variable

$AA_COUP_CORR for the corresponding following spindle. This is executed via a part

program or synchronized action.

Please note that the system variable can only be written once the mechanical coupling has

been created. Otherwise a new offset may arise when closing the chuck.

Requirements

To enable the system variable $AA_COUP_CORR to be written from the part program or

synchronized actions, a generic machine coupling must have been activated at least once for

the corresponding following spindle since the most recent controller power-up was performed.

If correction value $AA_COUP_CORR[S<n>] is a value other than zero and a generic machine

coupling has been active for following spindle S<n> (by means of CPFRS="machine"

or CPSETTYPE="COUP"), the following NC/PLC interface signal is set:

DB31, ... DBX103.0 (synchronism correction is taken into account)

Axes and spindles

Function Manual, 06/2019, A5E47437747B AA

Sinumerik 840d sl