Siemens SIROTEC Function Manual

Function modules
8.10 Parallel connection of power units
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
565
6-pulse parallel connection of Basic Line Modules
With the 6-pulse parallel connection, up to four Basic Line Modules are supplied by a
common two-winding transformer on the line side and controlled by a common Control Unit.
12-pulse parallel connection of Basic Line Modules
For 12-pulse parallel connections, up to four Basic Line Modules are supplied by a three-
winding transformer on the line side. In this case, an even number of modules, i.e. two or
four, must be divided between the two secondary windings. The Basic Line Modules of both
subsystems are controlled by a common Control Unit - even though the input voltages are
30° out of phase.
There is also the redundant version with which two BLMs in each case are controlled by one
Control Unit.
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 V
dc_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 V
dc_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.
Remedial measures:
● activate the V
dc_max
control:
– Vector control: p1240 = 1 (factory setting)
– Servo control: p1240 = 1
– V/f control: p1280 = 1 (factory setting)
● Inhibit V
dc_max
control:
– Vector control: p1240 = 0
– Servo control: p1240 = 0 (factory setting)
– V/f control: p1280 = 0
● Activate the V
dc_max
monitoring
– Vector control: p1240 = 4 or 6
– Servo control: p1240 = 4 or 6
– V/f control: p1280 = 4 or 6

Siemens SIROTEC Specifications

General

Brand	Siemens
Model	SIROTEC
Category	DC Drives
Language	English