Siemens SINAMICS S120 Function Manual page 212

Extended Functions
Motor changeover
Table 4-6
Parameter
p0130
p0180
p0186[0..1]
p0820
p0821 to p0824
p0826[0..1]
p0827[0..1]
p0830.1 and
p0830.2
p0831[0..1]
p0833[0..1]
p2155
Procedure for star/delta switchover
1. Start condition:
With synchronous motors, the actual speed must be lower than the speed used
in the field-weakening range. This ensures that the regenerative voltage
generated is greater than the terminal voltage.
2. Pulse inhibit:
A pulse inhibit is activated once a new drive data set has been selected by
means of p0820.
3. Open motor contactor:
Motor contactor 1 is opened r0830 = 0 and the status bit "Motor data set
switchover aktiv" (r0835.0) is set.
4. Switch over drive data set:
The requested data set is activated (r0051 = requested data set).
5. Motor contactor activation:
After confirmation (motor contactor opened) from motor contactor 1, the
corresponding bit in r0830 is set and motor contactor 2 is activated.
6. Enable pulses:
After confirmation (motor contactor closed) from motor contactor 2, the bit
"Motor switchover active" (r0835.0) is reset and the pulses are enabled again.
The switchover is complete.
4-212
Settings for the example
Settings
2
2
0, 1
p2197.2
0
0; 0
1, 2
Digital outputs auxiliary
contactors
Digital inputs auxiliary
contacts
0, 0, 0
Switchover speed
Comments
Configure 2 MDS.
Configure 2 DDS.
The MDS are assigned to the DDS.
Switchover to delta connection after
speed in p2155 is exceeded. d i 2155 i
Identical numbers signify the same
thermal model.
Assign the bit from p0830 to the
MDS. If p0827[0] = 1, for example, bit
p0830.1 is set when MDS0 is
selected via DDS0.
The digital outputs for the auxiliary
contactors are assigned to the bits.
The digital inputs for the checkback
from the motor contactors are
assigned.
The drive is responsible for
controlling the contactor circuit and
the pulse inhibit. Parking bit
(Gn_ZSW14) is set
Sets the speed at which the
switchover is to be carried out in
delta.
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
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