Siemens SINAMICS S120 Function Manual page 168

Operating Modes
Vector V/f control (r0108.2 = 0)
Description of Vdc_max control
V
controller active
dc
Fig. 3-50
The switch-in level for Vdc_max control (r1282) is calculated as follows:
S Automatic detection of ON level deactivated (p1294 = 0)
r1282 = 1.15 * p0210 (device supply voltage)
S Automatic detection of ON level activated (p1294 = 1)
r1282 = Vdc_max – 50 V (Vdc_max: overvoltage threshold of the Motor
Module)
Function diagram for Vdc controller (see List Manual)
S 6320
3-168
[V]
V
DC link
1
0
|n|
Switching Vdc_max control on/off
Vdc_max controller and Vdc_min controller
Switch-on level
n
act
n
setp
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
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