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12 Functional Descriptions 10.94

12.18.13 Start-up

Before commencing start-up of the GI grouping, you must complete the start-up procedure

described in the Section headed "Start-up of axis (analog) and spindle".

12.18.13.1 Brief start-up of a GI grouping

• Declare the desired following axis/spindle as a following drive by setting NC MD 1844*/

525* bit 0.

• Set the position control sampling time for the following drive and its leading drives to the

same value.

• In the case of a setpoint link, the same servo gain factor must be set for all drives

involved. Check whether the following error at a given velocity is the same for all drives.

• In the case of an actual value link, set the servo gain factor of the following drive to a

higher value to increase its dynamic performance.

• The following error of synchronous spindles can be checked only when the link is activated

(position controllers are then active).

• Set the following NC MDs so that the GI grouping can be configured and programmed

during start-up:

– NC MD 1844*/525* bit1 Reconfiguration permissible

– NC MD 1844*/525* bit2 Switchover of link factor permissible

– NC MD 1844*/525* bit3 Overwriting of synchronous positions permissible

– Execute a Power On to make the change effective (changes can be saved via the

machine data dialog beforehand)

• In cases where a following drive overlay (e.g. for on-the-fly synchronization) is required,

you must set the signal ENABLE FOLLOWING AXIS/SPINDLE OVERLAY (DB29/31) to

"1".

• For the on-the-fly synchronization function, the incremental speed (NC MD 300*) for axes

and the M19 creep speed of the appropriate gear stage (NC MD 427* to 434*) for spindles

must be set to a value other than "0".

The gearbox interpolation grouping is now functional and ready for programming.

12–154

SINUMERIK 840C (IA)

Siemens SINUMERIK 840C Installation Instructions

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