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

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
7.11.1.2

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 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 AC, 3-phase
500 to 690 V AC, 3-phase
The following rules must be observed when connecting Smart Line Modules in parallel:
● Up to 4 identical Smart Line Modules can be connected in parallel.
● A common Control Unit must always be used to implement the parallel connection.
● A 4% reactor is always required upstream of each Smart Line Module for the purpose of
● Special Line Connection Modules are available for the parallel connection.
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
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
Smart Line Modules
current balancing.
7.11 Parallel connection of power units
Rated power
250 ... 800 kW
450 ... 1400 kW
Function modules
407