Master/Slave For Active Infeed - Siemens Sinamics S120 Function Manual

Function modules

7.9 Master/slave for Active Infeed

Velocity limiting active (r2683.1)
If the actual setpoint velocity exceeds the maximum velocity p2571 - taking into account the
velocity override - it is limited and the control signal is set.
7.9 Master/slave for Active Infeed
7.9.1 Operating principle
This function allows drives to be operated with a redundant infeed. Redundancy can only be
implemented in the components specified below, such as Line Module, Motor Module and
Control Units. 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 line supplies/transformers with phase displacement and/or voltage difference
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 V
slaves receive their setpoint directly from the master and are only operated under current
control (parameter p3513 = 1).
Electrical isolation from the line with isolating transformers is necessary to prevent equalizing
currents from flowing.
The infeed can be decoupled from the DC link by means of a DC breaker.
390
still be placed down).
velocity.
redundancy).
to a common DC link.
voltage control (parameter p3513 = 0) with current control. The
dc
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions