4.20
Safe gearbox stage switchover
"Safe gearbox switchover" allows you to switch between 8 gearbox ratios in operation.
Switchover between gearbox ratios is only possible via PROFIBUS (p9601.3 = 1).
Parameterization
Before you can use "Safe gearbox switchover", you must parameterize the following values:
● Gear ratios
You can set up to 8 different gearbox ratios using parameter p9521 (denominator) and
p9522 (numerator).
● Direction reversal
Using parameter p9539, you can set as to whether a direction of rotation reversal is involved
for the particular gearbox.
● Position tolerance
As a result of the motion that can possibly occur when switching over the gearbox, it may be
necessary to increase the tolerance threshold for the duration of the switchover operation.
Using parameter p9539, you set how the tolerance is calculated when switching over the
gearbox:
– Without actual value synchronization: p9542 × p9543
– With actual value synchronization: p9549 × p9543
Selection
Proceed as follows to enable the "Safe gearbox switchover" function:
1. Set p9501.26 = 1
– If control via PROFIsafe is not parameterized, then the converter outputs fault F01681
with the appropriate fault value.
– If you activate the "Safe gearbox switchover" function on a converter, which does not
support the function, then the converter outputs fault F01682 with fault value 39.
2. Switch off the drive unit and then on again (POWER ON).
Safety functions integrated in the drive
4.20 Safe gearbox stage switchover
Safety Integrated (with SINAMICS S120)
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Commissioning Manual, 02/2020, A5E46305916B AB
