Siemens Sinamics S120 Function Manual page 230

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U/f control (vector control)

5.4 Vdc control

p1294 (automatic detection of the

ON level (U/f))

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

– 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

Switch-on level of the

Vdc_max control (r1282)

Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2

Drive functions

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