Siemens SINAMICS S120 Function Manual page 924

Applications
12.5 Motor changeover
Table 12- 2
Parameter
p0130
p0180
p0186[0...1]
p0820
p0821 to p0824 0
p0826[0...1]
p0827[0...1]
r0830.0 and r0830.1
p0831[0...1]
p0833.0..2
p2155.0...1
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.
924
Settings for the example
Settings
2
2
0, 1
p2197.2
0
0; 0
0, 1
Digital outputs, contac-
tors
Digital inputs, auxiliary
contacts
0, 0, 0
Changeover speed
Remark
Configure two MDS.
Configure two DDS.
The MDS are assigned to the DDS.
Changeover to delta connection after speed in
p2155 is exceeded.
Identical numbers signify the same thermal mod-
el.
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.
The digital outputs for the contactors are assigned
to the bits.
The digital inputs for the feedback signal of the
motor contactors are assigned.
The drive controls the contactor circuit and pulse
inhibition. Parking bit (Gn_ZSW14) is set.
Sets the speed at which the circuit is to be
changed over to the delta connection.
Note:
Using p2140, you can define an additional hyste-
resis for the changeover (refer to function diagram
8010 in the SINAMICS S120/150 List Manual).
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions