Siemens SINAMICS S120 Function Manual page 307

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.
Remedy
● activate the V
– Vector control: p1240 = 1 (factory setting)
– Servo control: p1240 = 1
– U/f control: p1280 = 1 (factory setting)
● Inhibit V
– Vector control: p1240 = 0
– Servo control: p1240 = 0 (factory setting)
– U/f control: p1280 = 0
● Activate the V
– Vector control: p1240 = 4 or 6
– Servo control: p1240 = 4 or 6
– U/f control: p1280 = 4 or 6
Function diagrams (see SINAMICS S120/S150 List Manual)
● 6320
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
WARNING
dc_max
of inertia.
control is active for multiple Motor Modules, then the controllers may have negative
dc_max
control:
dc_max
control:
dc_max
monitoring
dc_max
Vector control - Vdc_max controller and Vdc_min controller (V/f)
control for the Motor Module whose drive has the highest moment
U/f control (vector control)
7.5 Vdc control
control is
dc_max
control may only be
dc_max
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