Efficient Networks Siemens Sinamics S120 - Manual (Page 457)

Applications
11.3 Motor changeover
Drive Functions
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
457
Parameter Settings Remark
p0833.0..2 0, 0, 0 The drive controls the contactors and pulse
suppression. Parking bit (Gn_ZSW14) is set.
Procedure for switching over the motor data set
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 generated from being greater
than the terminal voltage.
2. Pulse suppression:
The pulses are cancelled after selecting a new drive data set using 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.
11.3.3 Example of a star/delta switchover
Preconditions:
● The drive has been commissioned for the first time.
● 2 motor data sets (MDS), p0130 = 2
● 2 drive data sets (DDS), p0180 = 2
● 2 digital outputs for controlling the auxiliary contactor
● 2 digital inputs for monitoring the auxiliary contactor
● 1 free speed monitoring (p2155)
● 2 auxiliary contactors with auxiliary contacts (1 NO contact)
● 2 motor contactors with positively-driven auxiliary contacts (1 NC contacts, 1 NO contact)
● 1 motor, 1 Control Unit, 1 infeed, and 1 Motor Module