Applications
12.5 Motor changeover
Drive functions
924 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Table 12- 2 Settings for the example
p0180 2 Configure two DDS.
The MDS are assigned to the DDS.
p0820 p2197.2 Changeover to delta connection after speed in
p2155 is exceeded.
p0826[0...1] 0; 0 Identical numbers signify the same thermal mod-
p0827[0...1] 0, 1 Assigning the bit from r0830 to the MDS. If
p0827[0] = 1, for example, bit r0830.1 is set when
MDS0 is selected via DDS0.
r0830.0 and r0830.1 Digital outputs, contac-
The digital output
s for the contactors are assigned
to the bits.
p0831[0...1] Digital inputs, auxiliary
The digital inputs for the feedback signal of the
motor contactors are assigned.
p0833.0..2 0, 0, 0 The drive controls the contactor circuit and pulse
inhibition. Parking bit (Gn_ZSW14) is set.
p2155.0...1 Changeover speed Sets the speed at which the circuit is to be
changed over to the delta connection.
Using p2140, you can define an additional hyste-
resis for the changeover (refer to function diagram
8010 in the SINAMICS S120/150 List Manual).
Procedure for star-delta changeover
1. Start condition:
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.
2. Pulse inhibit:
The pulses are suppressed after the changeover speed (p2155) is reached.
3. Open the motor contactor:
Motor contactor 1 is opened (r0830 = 0) and the status bit "Motor data set 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 changeover is
complete.
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