Siemens Sinamics S120 Function Manual page 690

Applications
11.2 Description
Procedure for star/delta changeover
1. Start condition:
2. Pulse inhibit:
3. Open the motor contactor:
4. Change over the drive data set:
5. Energize the motor contactor:
6. Enable the pulses:
Function diagrams (see SINAMICS S120/S150 List Manual)
● 8565 Drive Data Sets (DDS)
● 8570 Encoder Data Sets (EDS)
● 8575 Motor Data Sets (MDS)
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● r0051 0...4 CO/BO: Drive data set DDS effective
● p0130 Motor data sets (MDS) number
● p0140 Encoder data sets (EDS) number
● p0180 Drive data sets (DDS) number
● p0186 [0...n] motor data sets (MDS) number
● p0187 [0...n] encoder 1 encoder data set number
● p0188 [0...n] encoder 2 encoder data set number
● p0189 [0...n] encoder 3 encoder data set number
● p0820 BI: Drive data set selection DDS, bit 0
● ...
● p0824 BI: Drive data set selection DDS, bit 4
● p0826 [0...n] motor changeover motor number
688
For synchronous motors, the actual speed must be lower than the star field weakening
speed. This prevents the regenerative voltage from exceeding the terminal voltage.
The pulses are suppressed after the changeover speed (p2155) is reached.
Motor contactor 1 is opened (r0830 = 0) and the status bit "Motor data set changeover
active" (r0835.0) is set.
The requested data set is activated (r0051 = requested data set).
After the feedback signal (motor contactor opened) for motor contactor 1, the appropriate
bit of r0830 is set and motor contactor 2 is energized.
After the feedback signal (motor contactor closed) for motor contactor 2, the bit "motor
changeover active" (r0835.0) is reset and the pulses are enabled. The changeover is
complete.
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions