Connecting The Motors In Parallel - Siemens Sinamics S120 Function Manual

7.10

Connecting the motors in parallel

For simple commissioning of group drives (a number of identical motors operating on one
power unit) in control modes servo and vector, the number of parallel-connected motors can
be entered in STARTER or in the parameter list (p0306)
An equivalent motor is computed internally depending on the number of motors specified.
The motor data identification determines the data for an equivalent motor. Motors connected
in parallel can also operate on an encoder (on the 1st motor).
Note
For information about parallel connection of Motor Modules, please refer to section "Parallel
connection of power units".
Features
● Up to 50 motors connected in parallel can be operated on one frequency converter.
● It is not permissible to connect synchronous or reluctance motors in parallel.
● The original motor data set (p0300 ff.) is not modified. It is merely the data set transfer to
● The stationary motor data identification also works for parallel connections.
● The rotating measurement function also works if the motors can rotate without distance
● The cable lengths for motors connected in parallel must be as symmetrical as possible to
Commissioning via STARTER
Parameter p0306 is assigned in a STARTER commissioning screen. When the subsequent
parameters are set, p0306 is included in the calculation of the current limit (p0640) and in the
reference current (p2002). Parameter p0306 has a value range of 1 to 50, and is it
dependent on the motor data set (MDS).
To connect motors in parallel, select the corresponding motor in the selection screen and
select the "Parallel motor connection" option. Enter the number of motors in the parallel
connection in the entry field "Number". This display and input function is available for vector
control only. For servo control, the parallel connection of motors can only be configured
using the expert list (parameter p0306).
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
the closed-loop control which is organized according to the number of parallel-connected
motors.
limit. Uneven loading of the motors or a high degree of gear backlash will negatively
affect the accuracy of the rotating measurement result.
afford the most even possible distribution of current among individual motors.
Function modules
7.10 Connecting the motors in parallel
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