Siemens SINAMICS S120 Function Manual page 241

Vdc_max control
Figure 6-15
The switch-on level for V
● When automatic switch-in level sensing is disabled (p1254 = 0)
r1242 = 1.15 · p0210 (Drive unit line supply voltage, DC link)
● When automatic switch-in level sensing is enabled (p1254 = 1)
r1242 = V
Restrictions for Basic Line Modules
Unexpected motion of individual drives
If several Motor Modules are supplied from one infeed unit, then if the V
incorrectly parameterized, individual drives can accelerate in an uncontrolled fashion, which
can lead to death or severe injury.
● Only activate the V
● Inhibit this function for all other Motor Modules, or set this function to monitoring only.
If several Motor Modules are supplied from a non-regenerative infeed unit (e.g. a Basic Line
Module), or for power failure or overload (for SLM / ALM), the V
activated for a Motor Module whose drive should have a high moment of inertia. For the other
Motor Modules, this function must be disabled or monitoring must be set.
If the V
effects on each other in the case of unfavorable parameter assignment. The drives may
become unstable and individual drives may unintentionally accelerate.
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Switching the V
dc_max
- 50 V (V
dc_max
WARNING
dc_max
of inertia.
control is active for multiple Motor Modules, then the controllers may have negative
dc_max
control on/off
dc_max
-control (r1242) is calculated as follows:
: Overvoltage threshold of the Motor Module)
dc_max
control for the Motor Module whose drive has the highest moment
Vector control
6.9 Vdc control
control is
dc_max
control may only be
dc_max
239