Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 388)

Spindle Synchronization
Chapter 15
15-6
Function
The servos of a synchronized spindle pair are always given the same
commands. Thus, a well--balanced, synchronized spindle pair with equally
sized motors that operate on fairly symmetric loads may not need to use
this parameter. The normal spindle positioning loops should adequately
respond to keep the difference in following error between two spindles to a
minimum.
However, in some cases, the normal servo loop may allow too great a
difference in following error between spindles when motors are sized
differently or one servo is under a higher load than another. When the
normal spindle positioning loops are not sufficient to compensate for this
difference in following error, use the Synch Gain parameter.
When synchronization occurs, the control detects a difference in following
error between the two servos. When using Synch Gain, this difference in
the following error is controlled by increasing or decreasing the gain of the
follower spindle. This causes the control to make the follower spindle’s
response match more closely with that of the controlling spindle.
The follower spindle’s gain is modified proportionally to the difference in
following errors between the controlling and follower spindles
(= synchronization error). The ratio of this multiplier is controlled by this
parameter. Here, a value of 0 disables any gain modification of the
follower spindle. The higher the value set here, the larger the gain
modification for the same difference in following error.
This parameter determines the amount of positional spindle gain necessary
to attempt to correct positional discrepancy once synchronization is active.
Parameter
Number
[593]
Range
0.000 to 1.000
Notes
This is a global parameter. The value set here applies to both spindles.
15.4
Synch Gain