Positioning behavior of the axes
The Trace function over position setpoint steps using a part program with different feeds can
be used to check the positioning behavior.
● If a direct scale is used, the response behavior of the carriage can be seen easily.
● If a
motor encoder is used to close the position control loop (indirect feedback), the response
behavior of the carriage for the closed position control loop with the Trace function cannot
be determined.
In general, jerk values between 20 and 100 are used for machines with SINUMERIK 828D.
The test program should move the axis over an adequate distance so that the programmed
feedrate velocity can be attained.
A delay time, for example 0.5 seconds, after the feedrate velocity and the position setpoint is
attained, should be used. The first programmed feedrate velocity should be 50% of the
maximum axis feedrate. This behavior should be checked for all increments of the feedrate
override up to the maximum feedrate velocity.
6.3.2 Parts program for axis jerk
Part program for checking
The following NC program can be used in automatic or MDI operation depending on the
configuration of the deployed machine. The program contains commands for the activation/
deactivation of the trace trigger:
FFWON
SOFT
$AN_SLTRACE=0; Reset Start Servo-Trace-Trigger
LAB:
G01 Y210 F10000
G04 F0.5
$AN_SLTRACE=1; Start Servo-Trace-Trigger
Y260
G04 F0.5
GOTOB LAB
M30
View the trace results:
Select <MENU SELECT> → "Diagnosis" operating area, menu forward key → "Trace" softkey
and press <CYCLE START>:
The axis moves and the selected signals are monitored for five seconds. The result is then
displayed.
Machine data:
Tuning
6.3 Optimizing the axis jerk
CNC commissioning
184 Commissioning Manual, 10/2015, 6FC5397-3DP40-5BA3
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