Star Delta Reversing Starter" Control Function - Siemens SIMOCODE pro Operating Manual

Parameters
4.2 Motor control
4.2.2.8

"Star delta reversing starter" control function

Description
With this control function, a motor can be started in both directions of rotation in star-delta
operation.
Control commands
● CW rotation: Start with "ON >" first activates the QE1 contactor control (star contactor)
and then immediately activates the QE3 contactor control (line contactor, clockwise
rotation)
● Counter-clockwise rotation: Start with "ON <" first activates the QE1 contactor control
(star contactor) and then immediately activates the QE4 contactor control (line contactor,
counter-clockwise rotation)
● Stop with "OFF" deactivates contactor controls QE1, QE2, QE3, and QE4.
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, QE3 and QE4 contactor controls to be
deactivated.
Switching from star to delta
For this purpose, SIMOCODE pro first deactivates contactor control QE1 before connecting
contactor control QE2 (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
– Transformer installed in supply cable: I < 90 % I
● Time-dependent to the time set in the parameter "Max. star time" when the current in star
operation does not sink below this threshold.
Switching the direction of rotation
The direction of rotation can be switched once the "Status - ON >" or "Status - ON <" signal
has expired (motor is switched off) and the interlocking time has elapsed:
● Via the OFF control command.
● Directly when "Saving change-over command" is activated.
SIMOCODE pro prevents both contactors from switching on at the same time. Switching
from one direction of rotation to the other can be delayed via the "interlocking time."
Startup is always performed in star mode
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SIMOCODE pro - Parameterize
Operating Manual, 04/2017, A5E40507630002A/RS-AA/001