Siemens SIMOCODE pro - Star-Delta Starter Control Function

Parameters
4.2 Motor control
SIMOCODE pro - Parameterize
82 Operating Manual, 04/2017, A5E40507630002A/RS-AA/001
4.2.2.7
"Star-delta starter" control function
Description
Star-delta starting is used to limit the starting current and to avoid overloading the line
supply. In this control function, SIMOCODE pro initially starts the motor with a star-
connected stator winding and then switches it to delta.
Control commands
● Start with "ON" first activates the QE1 contactor control (star contactor) and then
immediately activates the QE3 contactor control (line contactor)
● Stop with "OFF" deactivates contactor controls QE1, QE2, and QE3.
The control commands can be issued to SIMOCODE pro from any control stations (see also
the description of "control stations"). Thus, the inputs (plugs) must be connected to the
corresponding sockets, preferably to the "Enabled control command" sockets. Every fault
message causes the QE1, QE2 and QE3 contactor controls to be deactivated.
Switching from star to delta
For this purpose, SIMOCODE pro first deactivates QE1 contactor control again, before
connecting QE2 contactor control (delta contactor). SIMOCODE pro switches over from star
to delta:
● Current-dependent, for decreasing current below the following thresholds:
– Transformer installed in delta circuit: I < 150 % I
s
– Transformer installed in supply cable: I < 90 % I
s
● Time-dependent to the time set in the parameter "Max. star time" when the current in star
operation does not sink below this threshold.