Master/Slave Function For Active Infeed; Operating Principle - Siemens SINAMICS S120 Function Manual

Function modules

7.12 Master/slave function for Active Infeed

7.12 Master/slave function for Active Infeed
7.12.1

Operating principle

Description
This function allows drives to be operated with a redundant infeed. Redundancy can be
implemented only in the components specified below, such as LT, CM and VSM. The
function can be applied for the following applications:
● Hoisting gear that is to continue functioning in emergency mode (e.g. so that the load can
● Paper and steel works that require a line drive to continue operation at a reduced line
● Oil production platforms that must continue normal production even if one infeed fails (full
● Expansion of output range for plants with infeeds of different dimensions
● Infeed from mains supplies/transformers with phase displacement and/or voltage
This function requires each infeed to be served by a separate Control Unit. It also requires
either a higher-level control system (e.g. SIMATIC S7) to transfer current setpoints using the
PROFIBUS slave-to-slave communication capability or TM31 modules which transmit
current setpoints in the form of analog signals. If the infeeds are appropriately configured,
operation can continue even if an infeed has failed. The master is selected by the controller
and operated under U
slaves receive their setpoint directly from the master and are only operated under current
control (parameter p3513 = 1).
The infeeds must be isolated from the mains, for example, by means of an isolating
transformer. Electrical isolation from the line with isolating transformers is necessary to
prevent equalizing currents.
The infeed can be decoupled from the DC link by means of a DC breaker.
336
still be placed down)
.
velocity.
redundancy).
difference to a common DC link.
DC link
voltage control (parameter p3513 = 0) with current control. The
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions