Siemens SINAMICS S120 Function Manual page 513

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adapted in this way, then the change in capacitance will affect the dynamic response of the V

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

Activating the function

The "Master/Slave" function is activated in Startdrive for the respective infeed unit using the

"Master/Slave" checkbox/option ("Infeed > Parameters > Basic parameter assignment >

Function modules"). 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.

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.

The Vdc setpoint in p3510 must be set high enough to prevent the standby controller from

responding to line overvoltage (the response threshold of 97% can be increased if necessary,

but current and voltage harmonics will develop if the setting causes overcontrol).

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.

Switching over Master/Slave

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 an ALM to an operational system

In an operational master-slave group, an ALM must first be switched in as a slave.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

9.9 Master/slave function for Active Infeed

from p3510 of the master and the slaves must be set

tolerance bandwidth monitoring functions correctly.

Function modules