Siemens SIMATIC S7-300 Manual page 148

Starting up the FM 354
Compromise When optimizing for several of the above criteria, you can determine the ma-
optimization
chine data from the results of the individual optimizations by a variety
of methods:
7.3.5 Realigning the reference point coordinates
Axis with incre-
To ensure distinct reproducibility of reference recordings, it is necessary for
mental encoder
the synchronizing zero pulse (SYNI) to be a distinct distance away from the
reference point switch (RPS). At low reducing speeds, we recommend a dis-
tance of from 10% to 90% of the distance of one encoder revolution. For high
reducing speeds we recommend 30% to 60%. Check this value in the servic-
ing data report after executing a reference point approach (switch alignment
value) and if you find nonconformity to the required value range, make a
corresponding adjustment in the relative position allocation between the en-
coder and the reference point switch.
Example: Positive search direction
7-22
Guarantee of all partial results
– Least determined value of MD38
– Greatest value for each of MD40, MD41 and MD42
Prioritization of one optimization criterion
Set MD38 and MD40-MD42 to the values that match the highest-priority
optimization criterion for your application, and again evaluate response as
to the remaining criteria.
Taking the mean of partial results
Set MD38 and MD40-MD42 to the means of the individual partial results,
and again evaluate response as to all criteria.
zero pulse
Switch readjustment displayed: 40 %
(suitable for high reducing speeds)
SYNI
RPS
MD12
MD12
FM 354 Servo Drive Positioning Module