Siemens SINAMICS S120 Function Manual page 784

Applications
12.5 Description
Procedure for changeover between motor data sets
1. Start condition:
For synchronous motors, the actual speed must be lower than the speed at the start of
field weakening. This prevents the regenerative voltage from exceeding the terminal
voltage.
2. Pulse inhibit:
The pulses are inhibited after a new drive data set is selected with p0820 to p0824.
3. Open the motor contactor:
Motor contactor 1 is opened (r0830 = 0) and the status bit "Motor changeover active"
(r0835.0) is set.
4. Change over the drive data set:
The requested data set is activated (r0051 = requested data set).
5. Energize the motor contactor:
After the feedback signal (motor contactor opened) for motor contactor 1, the appropriate
bit of r0830 is set and motor contactor 2 is energized.
6. Enable the pulses:
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 motor has now
been changed over.
Example of a star-delta changeover (via speed threshold; encoderless)
Requirements
● The first commissioning has been completed.
● 2 motor data sets (MDS), p0130 = 2
● 2 drive data sets (DDS), p0180 = 2
● 2 digital outputs to control the auxiliary contactors
● 2 digital inputs to monitor the auxiliary contactors
● 1 free speed monitoring (p2155)
● 2 auxiliary contactors with auxiliary contacts (1 NO contact)
● 2 motor contactors with positively-driven auxiliary contacts (1 NC contact, 1 NO contact)
● 1 motor, 1 Control Unit, 1 infeed, and 1 Motor Module
784
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions