Parallel Connection Of Smart Line Modules - Siemens SINAMICS S120 Function Manual

Function modules
7.10 Parallel connection of power units
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
7.10.1.2

Parallel connection of Smart Line Modules

Smart Line Modules are infeed/regenerative feedback units. Like the Basic Line Modules,
they supply energy to the connected Motor Modules, but unlike the Basic Line Module, they
are capable of feeding back regenerative energy to the line supply.
The DC-link voltage is greater than the rms value of the line rated voltage by a factor of 1.3.
Smart Line Modules in chassis format are suitable for connection to grounded (TN, TT) and
non-grounded (IT) supply systems. The following voltages and power ratings are available:
Table 7- 8
Line supply voltage
380 to 480 V 3 phase AC
500 to 690 V 3-phase AC
508
WARNING
– 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
Smart Line Modules
Rated power
250 ... 800 kW
450 ... 1400 kW
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions