Siemens SINAMICS S120 Commissioning Manual page 56

Commissioning
2.1 Procedure when commissioning
CAUTION
In STARTER, after the changeover of the axis type via p9302/p9502 and subsequent
POWER ON, the units that depend on the axis type are only updated after a project upload.
Vdc control with Basic Line Modules
If several Motor Modules are supplied from a non-regenerative infeed unit (e.g. a Basic Line
Module), the Vdc_max control may only be activated for that Motor Module whose drive has
the nominal highest moment of inertia of all connected drives.
For the other Motor Modules this function must be disabled or monitoring must be set.
If the Vdc_max control is active for several Motor Modules, then for an unfavorable
parameterization, the controllers can mutually influence one another negatively. The drives
can become unstable, individual drives can unintentionally accelerate.
 Activating the Vdc_max control:
 Inhibiting the Vdc_max control:
 Activating the Vdc_max monitoring function
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DANGER
– Vector control: p1240 = 1 (factory setting)
– Servo control: p1240 = 1
– U/f control: p1280 = 1 (factory setting)
– Vector control: p1240 = 0
– Servo control: p1240 = 0 (factory setting)
– U/f control: p1280 = 0
– Vector control: p1240 = 4 or 6
– Servo control: p1240 = 4 or 6
– U/f control: p1280 = 4 or 6
Commissioning Manual, (IH1), 01/2012, 6SL3097-4AF00-0BP2
Commissioning Manual