Siemens SINUMERIK MC Commissioning Manual page 263

Setting
Minimum actual current
sensing
Acceleration voltage toler‐
ance
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB
6.5 Configuring NC and drive-specific safety settings
Meaning
Sets the minimum current for encoderless actual value acquisition referred
to 1 A (i.e. 1 % = 10 mA).
● The value must be increased if C01711 is output with message value
1042.
● The value must be decreased if C01711 is output with message value
1041.
For synchronous motors, the following condition must be satisfied:
|p0305 x p9783| >= minimum current actual value acquisition x 1.2
Recommendation: If necessary, to determine the correct value, the mini‐
mum motor current must be measured.
Notice: An excessive reduction of this percentage value can result in a
safety message and in an inaccurate actual value.
Dependencies: r9785, C01711
Sets the acceleration limit to filter discontinuities in the speed/velocity. The
filter is deactivated when setting the maximum value.
An increase in this percentage value means that velocity peaks can occur
when accelerating, which do not reflect the real velocity characteristic.
A decrease in this value dampens velocity peaks when accelerating.
● The value must be increased if message C01711 is output with the
value 1043.
● The value must be decreased if acceleration has resulted in an exces‐
sive safety actual velocity.
Recommendation: This parameter setting depends on the motor and
closed-loop control, and must be redetermined for each configuration.
To do this, a measurement must be made while the actual value is chang‐
ing (step function/jump), and the limit should be set so low in r9785[0] via
p9589 that it is not exceeded more than four times per second by the value
set in r9785[1]. At this point in time, the actual value correction filter inter‐
venes. The step is no longer so drastic.
Dependencies: r9784, C01711
Commissioning and configuring
263