Siemens SINAMICS S120 Function Manual page 145

Description of Vdc_max control
V
controller active
dc
Fig. 3-39
The switch-in level for Vdc_max control (r1242) is calculated as follows:
S Automatic detection of ON level deactivated (p1254 = 0)
r1242 = 1.15 * p0210 (device supply voltage, DC link)
S Automatic detection of ON level activated (p1254 = 1)
r1242 = Vdc_max – 50 V (Vdc_max: overvoltage threshold of the Motor
Module)
Function diagrams (refer to the List Manual)
S 6220
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
[V]
V
dc
1
0
|n|
I
qsetp
0 A
Switching Vdc_max control on/off
Vdc_max controller and Vdc_min controller
Switch-on level
n
act
n
setp
I
= Torque-generating current setpoint
qsetp
Operating Modes
Vector control
t
t
t
3-145