Commissioning - Siemens SINAMICS S120 Function Manual

Function modules
8.9 Master/slave function for Active Infeed
8.9.5

Commissioning

Line supply and DC link identification
Before the "Master/slave" operation option is enabled in STARTER, the line supply and DC
link identification (see Section Line supply and DC link identification (Page 35)) must be
executed during commissioning for each infeed line.
Please follow the instructions given in the SINAMICS S120 Commissioning Manual with
STARTER for commissioning infeed units.
Once each individual infeed has been identified, the correct inductance for current control
and the DC link capacitance for voltage control are set.
If a DC breaker for isolating the infeed from the DC link is installed, DC link identification
must be performed again for all active infeeds after one has been disconnected, as it is
necessary to acquire the DC link capacitance again. If the DC link capacitance is not
adapted in this way, then the change in capacitance will affect the dynamic response of the
V control.
dc
Note
Aligning the setpoints of the DC link voltage
The setpoints of the DC link voltage V
to
the same values to ensure that the V
Activation of the master/slave function
The "Master/slave" function is activated with the checkbox/option "Master/Slave" in the
STARTER wizard for the relevant infeed. Parameter r0108.19 can be used to scan for an
active function module in the CU or the Active Line Modules (r0108.19 = 1).
All other required parameters are set via the corresponding expert lists for the relevant
infeed.
Note
The bus cycle time for Active Line Modules operating in master-slave operation must not
exceed 2 ms. If the bus cycle time is higher, then the dynamic response (p3560) must be
significantly reduced. This means that load surges can no longer be corrected properly.
Increasing the bus cycle time can cause the DC link voltage to oscillate, an effect which can
sometimes be managed by reducing the dynamic response (p3560). The system cannot be
guaranteed to function reliably with bus cycle times of > 2 ms.
556
from p3510 of the master and the slaves must be set
dc
tolerance bandwidth monitoring functions correctly.
dc
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions