Siemens SINAMICS S120 Function Manual page 541

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:
Example of a star/delta changeover
Requirements
● First commissioning has been completed.
● 2 motor data sets (MDS), p0130 = 2
● 2 drive data sets (DDS), p0180 = 2
● 2 digital outputs for controlling the auxiliary contactors
● 2 digital inputs for monitoring 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
Drive functions
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
For synchronous motors, the actual speed must be lower than the speed at the start of
field weakening. This prevents the regenerative voltage generated from being greater
than the terminal voltage.
The pulses are inhibited after a new drive data set is selected with p0820 to p0824.
Motor contactor 1 is opened r0830 = 0 and the status bit "Motor 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 motor has now
been changed over.
Applications
11.3 Motor changeover
541