12 Functional Descriptions 10.94
12.18.13 Start-up
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.
12–156
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SINUMERIK 840C (IA)