Siemens SINAMICS S120 Function Manual page 268

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U/f control (vector control)

5.4 Vdc control

Inadvertent acceleration of individual drives

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 Vdc_max control may only be

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 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

– 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

Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3

Drive functions