Safe Gearbox Stage Switchover - Siemens Sinamics S120 Function Manual

4.2.19

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
– If you activate the "Safe gearbox switchover" function on a converter, which does not
2. Switch off the drive unit and then on again (POWER ON).
Gearbox switchover without increased position tolerance
In order to switch over the gearbox stage, where no increased tolerance is required for the
crosswise comparison of the actual positions, proceed as follows:
1. Set the new gearbox stage using bits 0 to 2 in byte 3 of S_STW2.
2. The actual values are then synchronized once automatically. This synchronization is used
to compensate any possible difference that occurs between the position actual values of
the two monitoring channels as a result of the switchover operation.
The new gearbox stage is then active.
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
with the appropriate fault value.
support the function, then the converter outputs fault F01682 with fault value 39.
Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
157