Siemens Sinamics s120 Commissioning Manual page 168

Commissioning
3.10 Commissioning of power units connected in parallel
Configuration of parallel connections using parameters
From the perspective of the higher-level controller, the parallel connection of infeeds
behaves exactly the same as when controlling a single infeed, whose power is the same as
the total power of the individual infeeds connected in parallel.
PROFIdrive telegrams allow 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. They are documented in chapter
"Communication according to PROFIdrive" in the SINAMICS S120 Drive Functions Function
Manual.
Power units should only be activated and deactivated in the event of a fault, for example,
after replacing a failed power unit. This approach is unsuitable for variable power control,
because the Control Unit recalculates the drive line-up control parameters after every
change. 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:
● Using p0125, you activate or deactivate a power unit from the topology (select using the
topology number).
● With p0895, you specifically activate or deactivate power units via an interconnected
digital input (BI).
● The number of currently active power units in a parallel connection is displayed in r7000.
● After a fault or replacement, parameter p7001 allows you to specifically deactivate or
activate connected power units.
Alarm messages (e.g. as a result of overtemperature) can still be sent in this state. 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 to query whether the pulses in a power unit are inhibited or
enabled.
● The circulating currents of U, V, W at the power units are displayed in parameters r7050,
r7051 and r7052.
● Overload states and various temperature states in the power units can be displayed in
parameters from r7200 up to r7219.
Parallel connection is indicated with a "P" in front of the value shown on the parameter value
display.
Other parameters relevant for the operation and parameterization of power units can be
taken from the SINAMICS S120/S150 List Manual from parameter r7002 or from p0125
onwards.
168
STARTER Commissioning Manual
Commissioning Manual, (IH1), 07/2016, 6SL3097-4AF00-0BP5