Siemens SINAMICS S120 Function Manual page 192

Extended functions
Motor changeover
Table 4-6
Parameters
p0130
p0180
p0186[0..1]
p0820
p0821 to p0824
p0826[0.0.1]
p0827[0..1]
p0830.1 and
p0830.2
p0831[0..1]
p0833[0..1]
p2155
Star / delta changeover sequence
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. Cancel pulses:
After a new drive data set has been selected using p0820, the pulses are
cancelled.
3. Open motor contactor:
Motor contactor 1 is opened r0830 = 0 and the status bit "Motor data set
changeover active" (r0835.0) is set.
4. Changeover drive data set:
The requested data set is activated (p0051 = requested data set).
5. Energize motor contactor:
After the feedback signal (motor contactor opened) for motor contactor 1 has
been received, the appropriate bit of r0830 is set and motor contactor 2 is
energized.
4-192
Settings for the example
Settings
2
2
0, 1
p2197.2
0
0; 0
1, 2
Digital outputs, auxiliary
contactors
Digital inputs, auxiliary switches
0, 0
Changeover speed
Note
Configure 2 MDS
Configure 2 DDS
The MDS are assigned the DDS.
Change over to the delta circuit
configuration after the speed in configuration after the speed in
p2155 has been exceeded.
The same numbers indicate the
same thermal model.
The bits from p0830 are
assigned to the MDS. If p0827[0]
= 1, for example, bit p0830.1 is
set via DDS0 when MDS0 is
selected.
The digital outputs for the
auxiliary contactors are assigned
bits.
The digital inputs for the
feedback signal of the motor
contactors are assigned.
The drive controls the contactors
and the pulse cancellation.
Sets the speed at which the delta
circuit configuration should be
selected.
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition