Function Diagrams And Parameters - Siemens Sinamics S120 Function Manual

Function modules
7.9 Master/slave for Active Infeed
In any case, the tolerance band must be set wide enough that it will not be violated should
the control factor reserve controller still respond because the measures described above
have not been implemented.
Master/slave switchover
If a power unit fails during operation, the higher-level controller can switch each infeed line
from current control (slave operation) to DC link voltage control (master operation) and vice
versa (parameter setting for master: p3513= 0, for slave: p3513 = 1).
Switching in an ALM in operation
In an operational master-slave group, an ALM must first be switched in as a slave.
Shutting down an ALM from an operating group
Shutting down an ALM from the group should be realized in the slave state and with OFF2
(pulse inhibit). If a master fails with a fault (OFF2 response, pulse inhibit), one of the slaves
must be immediately switched as master.
Two masters must not be operated simultaneously in the infeed group.
7.9.6

Function diagrams and parameters

Function diagrams (see SINAMICS S120/S150 List Manual)
● 8940 Controller control factor reserve/controller DC link voltage
● 8948 Master/slave (r0108.19 = 1)
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p3513 BI: Disable voltage-controlled operation
● p3516 infeed current distribution factor
● p3570 CI: Master/slave active current setpoint
● p3571[0...3] CI: Master/slave active current setpoint multiplexer input
● p3572 CI: Master/slave active current setpoint multiplexer selection
● r3573 CO: Master/slave active current setpoint multiplexer output
● p3574[0...3] master/slave DC link voltage monitoring
● r3575.0...2 BO: Master/slave DC link voltage monitoring status
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Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions