Efficient Networks Siemens Sinamics S120 - Manual (Page 458)

Applications
11.3 Motor changeover
Drive Functions
458
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
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Figure 11-3 Example: star/delta switchover
Table 11-4 Settings for the example
Parameter Settings Comments
p0130 2 Configure 2 MDS.
p0180 2 Configure 2 DDS.
p0186[0..1] 0, 1 The MDS are assigned to the DDS.
p0820 p2197.2
p0821 to p0824 0 0
Switchover to delta connection after speed in
p2155 is exceeded.
p0826[0..1] 0; 0 Identical numbers signify the same thermal
model.
p0827[0..1] 1, 2 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.
p0830.1 and p0830.2 Digital outputs auxiliary
contactors
The digital outputs for the auxiliary contactors are
assigned to the bits.
p0831[0..1] Digital inputs auxiliary
contacts
The digital inputs for the checkback from the
motor contactors are assigned.
p0833.0..2 0, 0, 0 The drive is responsible for controlling the
contactor circuit and the pulse inhibit. Parking bit
(Gn_ZSW14) is set.
p2155 Switchover speed Sets the speed at which the switchover is to be
carried out in delta.
Procedure for star/delta switchover
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:
After selecting a new drive data set using p0820, the pulses are inhibited.