Siemens SINAMICS S120 Commissioning Manual page 119

Configuration of parallel connections using parameters
From the point of view of a higher-level PLC, the parallel connection of infeeds behaves like
the activation of a single infeed, with the running total outputs of the individual infeeds.
A connection via PROFIdrive telegrams permits the power units to be individually activated
and their status queried using parameter services from a higher-level controller. Infeeds may
also be activated using the appropriate control and status words. These are documented in
the chapter "Communication according to PROFIdrive" in the SINAMICS S120 Drive
Functions Function Manual.
Power units should only be activated and deactivated if an error occurs, that is when a power
unit fails and must be exchanged. This approach is unsuitable for variable power control, as
the drive line-up control parameters need to be recalculated after every firmware change, for
instance when the drive line-up is commissioned. Optimal, highly dynamic control behavior
of the drive line-up can only be ensured by recalculation.
The power units can be monitored and parameterized individually:
via the individual parameters p0125..p0128, p0895, r7000, p7001ff:
● Parameter p0125[0...n] "activate/deactivate power unit components" permits targeted
● With p0895[0...n] BI: power unit components, a power unit is activated or deactivated
● The number of currently active power units connected in parallel can be displayed by
● After an error or exchange of units, parameter p7001[0...n] (Par_circuit enable power
You can still cancel alarms in this state (due to overtemperatures for example). Individual
power units cannot be disabled for motors with separate winding systems (p7003 = 1).
p7001 is reset automatically if a power unit is deactivated with p0125 or p0895.
● You can use parameter r7002[0..n] to query whether the pulse in a power unit is inhibited
● Parameters r7050[0..n], r7051[0..n] and r7052[0..n] can be used to display the circuit
● Overload states and various temperature states in the power units can be displayed with
Parallel connection is indicated with a "P" in front of the value shown on the parameter value
display.
You can find out more about other parameters relevant for the operation and
parameterization of power units in the references: SINAMICS S120/S150 List Manual from
parameter r7002ff or p0125 onwards.
Commissioning Manual
Commissioning Manual, (IH1), 01/2011, 6SL3097-4AF00-0BP1
activation or deactivation of a power unit in the topology (choice via the topology
number).
using an interconnected digital input (BI).
parameter r7000.
units) allows targeted activation or deactivation of connected power units.
or enabled.
currents for U, V, W on the power units.
parameters from r7200[0..n] onwards.
2.10 Commissioning of power units connected in parallel
Commissioning
117